Vertebra - wikipedia Vertebra For other uses, see Vertebra ( disambiguation ). Vertebra A typical vertebra, superior view A section of the human vertebral column, showing multiple vertebrae in a left posterolateral view. Details Part of Spinal column Identifiers Latin Vertebratus MeSH D013131 TA A02. 2.01. 001 FMA 9914 Anatomical terms of bone ( edit on Wikidata ) In the vertebrate spinal column, each vertebra is an irregular bone with a complex structure composed of bone and some hyaline cartilage, the proportions of which vary according to the segment of the backbone and the species of vertebrate. The basic configuration of a vertebra varies ; the large part is the body, and the central part is the centrum. The upper and lower surfaces of the vertebra body give attachment to the intervertebral discs. The posterior part of a vertebra forms a vertebral arch, in eleven parts, consisting of two pedicles, two laminae, and seven processes. The laminae give attachment to the ligamenta flava ( ligaments of the spine ). There are vertebral notches formed from the shape of the pedicles, which form the intervertebral foramina when the vertebrae articulate. These foramina are the entry and exit conducts for the spinal nerves. The body of the vertebra and the vertebral arch form the vertebral foramen, the larger, central opening that accommodates the spinal canal, which encloses and protects the spinal cord. Vertebrae articulate with each other to give strength and flexibility to the spinal column, and the shape at their back and front aspects determines the range of movement. Structurally, vertebrae are essentially alike across the vertebrate species, with the greatest difference seen between an aquatic animal and other vertebrate animals. As such, vertebrates take their name from the vertebrae that compose the vertebral column. Contents 1 Structure 1.1 Regional variation 1.1. 1 Cervical vertebrae 1.1. 2 Thoracic vertebrae 1.1. 3 Lumbar vertebrae 1.1. 4 Sacrum 1.1. 5 Coccyx 1.2 Development 2 Function 3 Clinical significance 4 Other animals 5 Additional images 6 See also 7 References 8 External links Structure Each vertebra is an irregular bone. The size of the vertebrae varies according to placement in the vertebral column, spinal loading, posture and pathology. Along the length of the spine the vertebrae change to accommodate different needs related to stress and mobility. Side view of vertebrae Anatomy of a vertebra Every vertebra has a body, which consists of a large anterior middle portion called the centrum ( plural centra ) and a posterior vertebral arch, also called a neural arch. The body is composed of cancellous bone, which is the spongy type of osseous tissue, whose micro-anatomy has been specifically studied within the pedicle bones. This cancellous bone is in turn, covered by a thin coating of cortical bone ( or compact bone ), the hard and dense type of osseous tissue. The vertebral arch and processes have thicker coverings of cortical bone. The upper and lower surfaces of the body of the vertebra are flattened and rough in order to give attachment to the intervertebral discs. These surfaces are the vertebral endplates which are in direct contact with the intervertebral discs and form the joint. The endplates are formed from a thickened layer of the cancellous bone of the vertebral body, the top layer being more dense. The endplates function to contain the adjacent discs, to evenly spread the applied loads, and to provide anchorage for the collagen fibers of the disc. They also act as a semi-permeable interface for the exchange of water and solutes. The vertebral arch is formed by pedicles and laminae. Two pedicles extend from the sides of the vertebral body to join the body to the arch. The pedicles are short thick processes that extend, one from each side, posteriorly, from the junctions of the posteriolateral surfaces of the centrum, on its upper surface. From each pedicle a broad plate, a lamina, projects backwards and medialwards to join and complete the vertebral arch and form the posterior border of the vertebral foramen, which completes the triangle of the vertebral foramen. The upper surfaces of the laminae are rough to give attachment to the ligamenta flava. These ligaments connect the laminae of adjacent vertebra along the length of the spine from the level of the second cervical vertebra. Above and below the pedicles are shallow depressions called vertebral notches ( superior and inferior ). When the vertebrae articulate the notches align with those on adjacent vertebrae and these form the openings of the intervertebral foramina. The foramina allow the entry and exit of the spinal nerves from each vertebra, together with associated blood vessels. The articulating vertebrae provide a strong pillar of support for the body. There are seven processes projecting from the vertebra ; a spinous process, two transverse processes, and four articular processes. A major part of a vertebra is a backward extending spinous process ( sometimes called the neural spine ) which projects centrally. This process points dorsally and caudally from the junction of the laminae. The spinous process serves to attach muscles and ligaments. The two transverse processes, one on each side of the vertebral body project from either side at the point where the lamina joins the pedicle, between the superior and inferior articular processes. They also serve for the attachment of muscles and ligaments, in particular the intertransverse ligaments. There is a facet on each of the transverse processes of thoracic vertebrae which articulates with the tubercle of the rib. A facet on each side of the thoracic vertebral body articulates with the head of the rib. There are superior and inferior articular facet joints on each side of the vertebra, which serve to restrict the range of movement possible. These facets are joined by a thin portion of the vertebral arch called the pars interarticularis. The transverse process of a lumbar vertebra is also sometimes called the costal or costiform process because it corresponds to a rudimentary rib ( costa ) which, as opposed to the thorax, is not developed in the lumbar region. Regional variation Vertebrae take their names from the regions of the vertebral column that they occupy. There are thirty - three vertebrae in the human vertebral column -- seven cervical vertebrae, twelve thoracic vertebrae, five lumbar vertebrae, five fused sacral vertebrae forming the sacrum and three to five coccygeal vertebrae, forming the coccyx. The regional vertebrae increase in size as they progress downwards but become smaller in the coccyx. Cervical vertebrae Main article : Cervical vertebrae A typical cervical vertebra There are seven cervical vertebrae ( but eight cervical spinal nerves ), designated C1 through C7. These bones are, in general, small and delicate. Their spinous processes are short ( with the exception of C2 and C7, which have palpable spinous processes ). C1 is also called the atlas, and C2 is also called the axis. The structure of these vertebrae is the reason why the neck and head have a large range of motion. The atlanto - occipital joint allows the skull to move up and down, while the atlanto - axial joint allows the upper neck to twist left and right. The axis also sits upon the first intervertebral disc of the spinal column. Cervical vertebrae possess transverse foramina to allow for the vertebral arteries to pass through on their way to the foramen magnum to end in the circle of Willis. These are the smallest, lightest vertebrae and the vertebral foramina are triangular in shape. The spinous processes are short and often bifurcated ( the spinous process of C7, however, is not bifurcated, and is substantially longer than that of the other cervical spinous processes ). The atlas differs from the other vertebrae in that it has no body and no spinous process. It has instead a ring - like form, having an anterior and a posterior arch and two lateral masses. At the outside centre points of both arches there is a tubercle, an anterior tubercle and a posterior tubercle, for the attachment of muscles. The front surface of the anterior arch is convex and its anterior tubercle gives attachment to the longus colli muscle. The posterior tubercle is a rudimentary spinous process and gives attachment to the rectus capitis posterior minor muscle. The spinous process is small so as not to interfere with the movement between the atlas and the skull. On the under surface is a facet for articulation with the dens of the axis. Specific to the cervical vertebra is the transverse foramen ( also known as foramen transversarium ). This is an opening on each of the transverse processes which gives passage to the vertebral artery and vein and a sympathetic nerve plexus. On the cervical vertebrae other than the atlas, the anterior and posterior tubercles are on either side of the transverse foramen on each transverse process. The anterior tubercle on the sixth cervical vertebra is called the carotid tubercle because it separates the carotid artery from the vertebral artery. There is a hook - shaped uncinate process on the side edges of the top surface of the bodies of the third to the seventh cervical vertebrae, and also of the first thoracic vertebra. Together with the vertebral disc, this uncinate process prevents a vertebra from sliding backwards off the vertebra below it and limits lateral flexion ( side - bending ). Luschka 's joints involve the vertebral uncinate processes. The spinous process on C7 is distinctively long and gives the name vertebra prominens to this vertebra. Also a cervical rib can develop from C7 as an anatomical variation. The term cervicothoracic is often used to refer to the cervical and thoracic vertebrae together, and sometimes also their surrounding areas. Thoracic vertebrae Main article : Thoracic vertebrae A typical thoracic vertebra The twelve thoracic vertebrae and their transverse processes have surfaces that articulate with the ribs. Some rotation can occur between the thoracic vertebrae, but their connection with the rib cage prevents much flexion or other movement. They may also be known as ' dorsal vertebrae ', in the human context. The vertebral bodies are roughly heart - shaped and are about as wide anterio - posterioly as they are in the transverse dimension. Vertebral foramina are roughly circular in shape. The top surface of the first thoracic vertebra has a hook - shaped uncinate process, just like the cervical vertebrae. The term thoracolumbar is sometimes used to refer to the thoracic and lumbar vertebrae together, and sometimes also their surrounding areas. The thoracic vertebrae attach to ribs and so have articular facets specific to them ; these are the superior, transverse and inferior costal facets. As the vertebrae progress down the spine they increase in size to match up with the adjoining lumbar section. Lumbar vertebrae Main article : Lumbar vertebrae Lumbar vertebra showing mammillary processes A typical lumbar vertebra The five lumbar vertebrae are the largest of the vertebrae, their robust construction being necessary for supporting greater weight than the other vertebrae. They allow significant flexion, extension and moderate lateral flexion ( side - bending ). The discs between these vertebrae create a natural lumbar lordosis ( a spinal curvature that is concave posteriorly ). This is due to the difference in thickness between the front and back parts of the intervertebral discs. The lumbar vertebrae are located between the ribcage and the pelvis and are the largest of the vertebrae. The pedicles are strong as are the laminae and the spinous process is thick and broad. The vertebral foramen is large and triangular. The transverse processes are long and narrow and three tubercles can be seen on them. These are a lateral cosiform process, a mammillary process and an accessory process. The superior, or upper tubercle is the mammillary process which connects with the superior articular process. The multifidus muscle attaches to the mammillary process and this muscle extends through the length of the vertebral column, giving support. The inferior, or lower tubercle is the accessory process and this is found at the back part of the base of the transverse process. The term lumbosacral is often used to refer to the lumbar and sacral vertebrae together, and sometimes includes their surrounding areas. Sacrum Main article : Sacrum Sacrum There are five sacral vertebrae ( S1 -- S5 ) which are fused in maturity, into one large bone, the sacrum, with no intervertebral discs. The sacrum with the ilium forms a sacroiliac joint on each side of the pelvis, which articulates with the hips. Coccyx Main article : Coccyx The last three to five coccygeal vertebrae ( but usually four ) ( Co1 -- Co5 ) make up the tailbone or coccyx. There are no intervertebral discs. Development Somites form in the early embryo and some of these develop into sclerotomes. The sclerotomes form the vertebrae as well as the rib cartilage and part of the occipital bone. From their initial location within the somite, the sclerotome cells migrate medially towards the notochord. These cells meet the sclerotome cells from the other side of the paraxial mesoderm. The lower half of one sclerotome fuses with the upper half of the adjacent one to form each vertebral body. From this vertebral body, sclerotome cells move dorsally and surround the developing spinal cord, forming the vertebral arch. Other cells move distally to the costal processes of thoracic vertebrae to form the ribs. Function Functions of vertebrae include : Support. The vertebrae function in the skeletomuscular system by forming the vertebral column to support the body. Protection. Vertebrae contain a vertebral foramen for the passage of the spinal canal and its enclosed spinal cord and covering meninges. They also afford sturdy protection for the spinal cord. The upper and lower surfaces of the centrum are flattened and rough in order to give attachment to the intervertebral discs. Movement. The vertebrae also provide the openings, the intervertebral foramina which allow the entry and exit of the spinal nerves. Similarly to the surfaces of the centrum, the upper and lower surfaces of the fronts of the laminae are flattened and rough to give attachment to the ligamenta flava. Working together in the vertebral column their sections provide controlled movement and flexibility. Feeding the Intervertebral discs, through the reflex ( hyaline ligament ) plate that separates the cancellous bone of the vertebral body from each disk. The spinal cord nested in the vertebral column. Vertebral joint Costovertebral joint A facet joint between the superior and inferior articular processes ( labeled at top and bottom ). Clinical significance There are a number of congenital vertebral anomalies, mostly involving variations in the shape or number of vertebrae, and many of which are unproblematic. Others though can cause compression of the spinal cord. Wedge - shaped vertebrae, called hemivertebrae can cause an angle to form in the spine which can result in the spinal curvature diseases of kyphosis, scoliosis and lordosis. Severe cases can cause spinal cord compression. Block vertebrae where some vertebrae have become fused can cause problems. Spina bifida can result from the incomplete formation of the vertebral arch. Spondylolysis is a defect in the pars interarticularis of the vertebral arch. In most cases this occurs in the lowest of the lumbar vertebrae ( L5 ), but may also occur in the other lumbar vertebrae, as well as in the thoracic vertebrae. Spinal disc herniation, more commonly called a slipped disc, is the result of a tear in the outer ring ( anulus fibrosus ) of the intervertebral disc, which lets some of the soft gel - like material, the nucleus pulposus, bulge out in a hernia. This may be treated by a minimally - invasive endoscopic procedure called Tessys method. A laminectomy is a surgical operation to remove the laminae in order to access the spinal canal. The removal of just part of a lamina is called a laminotomy. A pinched nerve caused by pressure from a disc, vertebra or scar tissue might be remedied by a foraminotomy to broaden the intervertebral foramina and relieve pressure. It can also be caused by a foramina stenosis, a narrowing of the nerve opening, as a result of arthritis. Another condition is spondylolisthesis when one vertebra slips forward onto another. The reverse of this condition is retrolisthesis where one vertebra slips backwards onto another. The vertebral pedicle is often used as a radiographic marker and entry point in vertebroplasty, kyphoplasty, and spinal fusion procedures. The arcuate foramen is a common anatomical variation more frequently seen in females. It is a bony bridge found on the first cervical vertebra, the atlas where it covers the groove for the vertebral artery. Degenerative disc disease is a condition usually associated with ageing in which one or more discs degenerate. This can often be a painfree condition but can also be very painful. Other animals Regions of vertebrae in the goat In other animals the vertebrae take the same regional names except for the coccygeal -- in animals with tails the separate vertebrae are usually called the caudal vertebrae. Because of the different types of locomotion and support needed between the aquatic and other vertebrates, the vertebrae between them show the most variation, though basic features are shared. The spinous processes which are backward extending are directed upwards in animals without an erect stance. These processes can be very large in the larger animals as they attach to the muscles and ligaments of the body. In the elephant the vertebrae are connected by tight joints, which limit the backbone 's flexibility. Spinous processes are exaggerated in some animals, such as the extinct Dimetrodon and Spinosaurus, where they form a sailback or finback. Vertebrae with saddle - shaped articular surfaces on their bodies, are called `` heterocoelous '', which allows vertebrae to flex both vertically and horizontally, while preventing twisting motions. Such vertebrae are found in the necks of birds and some turtles. In many species, though not in mammals, the cervical vertebrae bear ribs. In many groups, such as lizards and saurischian dinosaurs, the cervical ribs are large ; in birds, they are small and completely fused to the vertebrae. The transverse processes of mammals are homologous to the cervical ribs of other amniotes. In the whale the cervical vertebrae are typically fused, an adaptation trading flexibility for stability during swimming. All mammals except manatees and sloths have seven cervical vertebrae, whatever the length of the neck. This includes seemingly unlikely animals such as the giraffe, the camel, and the blue whale, for example. Birds usually have more cervical vertebrae with most having a highly flexible neck consisting of 13 -- 25 vertebrae. In all mammals the thoracic vertebrae are connected to ribs and their bodies differ from the other regional vertebrae due to the presence of facets. Each vertebra has a facet on each side of the vertebral body which articulates with the head of a rib. There is also a facet on each of the transverse processes which articulates with the tubercle of a rib. The number of thoracic vertebrae varies considerably across the species. Most marsupials have thirteen, but koalas only have eleven. The norm is twelve to fifteen in mammals, ( twelve in the human ), though there are from eighteen to twenty in the horse, tapir, rhinoceros and elephant. In certain sloths there is an extreme number of twenty - five and at the other end only nine in the cetacean. There are fewer lumbar vertebrae in chimpanzees and gorillas, which have three in contrast to the five in the genus Homo. This reduction in number gives an inability of the lumbar spine to lordose but gives an anatomy that favours vertical climbing, and hanging ability more suited to feeding locations in high - canopied regions. The bonobo differs by having four lumbar vertebrae. Caudal vertebrae are the bones that make up the tails of vertebrates. They range in number from a few to fifty, depending on the length of the animal 's tail. In humans and other tailless primates, they are called the coccygeal vertebrae, number from three to five and are fused into the coccyx. Additional images Vertebral arches of three thoracic vertebrae Costovertebral joints seen from the front Lower thoracic and upper lumbar vertebrae seen from the side Cervical vertebrae seen from the back See also Limbus vertebra Functional spinal unit Pott disease Scheuermann 's disease References This article incorporates text in the public domain from page 96 of the 20th edition of Gray 's Anatomy ( 1918 ) Jump up ^ McGraw - Hill Science and Technology Jump up ^ `` Chapter 39 : The vertebral column ''. www.dartmouth.edu. Retrieved May 7, 2017. Jump up ^ Dorland 's ( 2012 ). Dorland 's Illustrated Medical Dictionary ( 32nd ed. ). Elsevier Saunders. p. 329. ISBN 978 - 1 - 4160 - 6257 - 8. Jump up ^ Gdyczynski, C.M. ; Manbachi, A. ; et al. ( 2014 ). `` On estimating the directionality distribution in pedicle trabecular bone from micro-CT images ''. Journal of Physiological Measurements. 35 ( 12 ) : 2415 -- 2428. doi : 10.1088 / 0967 - 3334 / 35 / 12 / 2415. CS1 maint : Explicit use of et al. ( link ) Jump up ^ Muller - Gerbl, M ; et al. ( Mar 2008 ). `` The distribution of mineral density in the cervical vertebral endplates ''. Eur Spine J. 17 ( 17 ( 3 ) ) : 432 -- 438. doi : 10.1007 / s00586 - 008 - 0601 - 5. PMC 2270387. PMID 18193299. Jump up ^ Taylor, Tim. `` Lumbar Vertebrae ''. InnerBody. Retrieved May 7, 2017. Jump up ^ Standring, Susan ( 2008 ) Gray 's Anatomy p. 746 Thoracic vertebrae Jump up ^ Platzer ( 2004 ), pp 42 -- 43 Jump up ^ Latin costa refers to either a `` rib '' or `` side '' of the body. ( Diab ( 1999 ), p 76 ) ^ Jump up to : Tweedie, A. The library of medicine p. 31 Jump up ^ Heinz Feneis, Wolfgang Dauber ( 2000 ) Pocket Atlas of Human Anatomy : Based on the International Nomenclature p. 2 Jump up ^ Postacchini, Franco ( 1999 ) Lumbar Disc Herniation p. 19 Jump up ^ Drake et al, Gray 's Anatomy for Students, Churchill Livingstone / Elsevier ( 2010 ), 2nd edition, chapter 2 ^ Jump up to : Walker, Warren F., Jr. ( 1987 ) Functional Anatomy of the Vertebrate San Francisco : Saunders College Publishing. Jump up ^ Dorland 's ( 2012 ). Dorland 's Illustrated Medical Dictionary ( 32nd ed. ). Elsevier Saunders. p. 1003. ISBN 978 - 1 - 4160 - 6257 - 8. Jump up ^ Cakmak, O ; et al. ( Sep 2005 ). `` Arcuate foramen its clinical significance ''. Saudi Med J. 26 ( 26 ( 9 ) ) : 1409 -- 13. PMID 16155658. Jump up ^ Kardong, Kenneth V. ( 2002 ). Vertebrates : comparative anatomy, function, evolution. McGraw - Hill. pp. 288 -- 289. ISBN 0 - 07 - 290956 - 0. Jump up ^ `` Beluga Whale ''. Yellowmagpie.com. 2012 - 06 - 27. Retrieved 2012 - 08 - 12. Jump up ^ `` About Whales ''. Whalesalive.org.au. 2009 - 06 - 26. Retrieved 2013 - 08 - 12. Jump up ^ Dierauf, Leslie ; Gulland, Frances M.D. ( June 27, 2001 ). `` CRC Handbook of Marine Mammal Medicine : Health, Disease, and Rehabilitation, Second Edition ''. books.google.com. CRC Press. Retrieved May 7, 2017. Jump up ^ Hyman, Libbie ( 1922 ). Comparative Vertebrate Anatomy. Chicago : University of Chicago Press. p. 123. Jump up ^ `` Physical Characteristics of the Koala ''. Australian Koala Foundation. Retrieved 1 February 2012. Jump up ^ Hyman ( 1922 ), p. 124 Jump up ^ Lovejoy, C.O and McCullum, M.A. ( 2010 ). `` Spinopelvic pathways to bipedality : why no hominids ever relied on a bent - hip - bent - knee gait ''. Philosophical Transactions of the Royal Society of London B : Biological Sciences. 365 ( 1556 ) : 3289 -- 99. doi : 10.1098 / rstb. 2010.0112. PMC 2981964. PMID 20855303. CS1 maint : Multiple names : authors list ( link ) Jump up ^ Kardong, Kenneth V. ( 2002 ). Vertebrates : comparative anatomy, function, evolution. McGraw - Hill. pp. 287 -- 288. ISBN 0 - 07 - 290956 - 0. Jump up ^ Hyman, Libbie ( 1922 ). Comparative Vertebrate Anatomy. Chicago : University of Chicago Press. p. 125. External links Wikimedia Commons has media related to Vertebra. Atlas image : back_bone13 at the University of Michigan Health System -- Axis & Atlas Articulated, Posterior View Anatomy image : skel / atlas2 at Human Anatomy Lecture ( Biology 129 ), Pennsylvania State University Anatomy photo : 26 : os - 0110 at the SUNY Downstate Medical Center Anatomy figure : 02 : 01 - 10 at Human Anatomy Online, SUNY Downstate Medical Center Anatomy figure : 18 : 02 - 01 at Human Anatomy Online, SUNY Downstate Medical Center Atlas image : back_bone28 at the University of Michigan Health System Anatomy figure : 02 : 02 - 08 at Human Anatomy Online, SUNY Downstate Medical Center The shapes of the articulating ends of vertebrae -- University of the Cumberlands Bone and cartilage Cartilage perichondrium fibrocartilage callus metaphysis Cells chondroblast chondrocyte Types hyaline elastic fibrous Bone Ossification Primary bone intramembranous endochondral Cells osteoblast osteoid osteocyte osteoclast Types cancellous cortical Regions subchondral bone epiphysis epiphyseal plate / metaphysis diaphysis Condyle Epicondyle Structure Osteon Haversian canals Volkmann 's canals connective tissue endosteum periosteum Sharpey 's fibres enthesis lacunae canaliculi trabeculae medullary cavity bone marrow Shapes long short flat irregular sesamoid Bones of torso Vertebrae General structure Body Arch pedicle lamina notch Vertebral foramen Intervertebral foramen Processes transverse articular spinous Spinal canal Cervical vertebrae Uncinate process of vertebra Transverse foramen Anterior tubercle Carotid tubercle Posterior tubercle Atlas lateral mass anterior arch posterior arch Axis dens Vertebra prominens Thoracic vertebrae Costal facets superior inferior transverse Uncinate process of vertebra Lumbar vertebrae Processes accessory mammillary Sacrum Base sacral promontory Ala of sacrum Lateral surface sacral tuberosity Pelvic surface anterior sacral foramina Dorsal surface posterior sacral foramina Median sacral crest Medial sacral crest Lateral sacral crest Sacral canal sacral hiatus Coccyx none Thorax Rib cage Ribs true ribs false ribs floating ribs Parts angle tubercle costal groove neck head Sternum Suprasternal notch Manubrium Sternal angle Body of sternum Xiphisternal joint Xiphoid process Thoracic cage Thoracic inlet Thoracic outlet Intercostal space Costal margin Infrasternal angle Spinal disease ( M40 -- M54, 720 -- 724, 737 ) Deforming Spinal curvature Kyphosis Lordosis Scoliosis Other Scheuermann 's disease Torticollis Spondylopathy inflammatory Spondylitis Ankylosing spondylitis Sacroiliitis Discitis Spondylodiscitis Pott disease non inflammatory Spondylosis Spondylolysis Spondylolisthesis Retrolisthesis Spinal stenosis Facet syndrome Back pain Neck pain Upper back pain Low back pain Coccydynia Sciatica Radiculopathy Intervertebral disc disorder Schmorl 's nodes Degenerative disc disease Spinal disc herniation Facet joint arthrosis Anatomy portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Vertebra&oldid=858540439 '' Categories : Wikipedia articles incorporating text from the 20th edition of Gray 's Anatomy ( 1918 ) Irregular bones Skeletal system Vertebrate anatomy Hidden categories : CS1 maint : Explicit use of et al. 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Question: the pedicles laminae and spinous process of a vertebra form the
Answer: vertebral arch