Thoracic vertebrae - wikipedia Thoracic vertebrae thoracic vertebrae Position of the thoracic vertebrae ( shown in red ). In human, thoracic vertebrae consists of 12 bones. From top to down, T1, T2,..., T12. A typical thoracic vertebra, seen from lateral side. Details Identifiers Latin vertebrae thoracicae MeSH D013904 TA A02. 2.03. 001 FMA 9139 72064, 9139 Anatomical terms of bone ( edit on Wikidata ) In vertebrates, thoracic vertebrae compose the middle segment of the vertebral column, between the cervical vertebrae and the lumbar vertebrae. In humans, there are twelve thoracic vertebrae and they are intermediate in size between the cervical and lumbar vertebrae ; they increase in size going towards the lumbar vertebrae, with the lower ones being a lot larger than the upper. They are distinguished by the presence of facets on the sides of the bodies for articulation with the heads of the ribs, as well as facets on the transverse processes of all, except the eleventh and twelfth, for articulation with the tubercles of the ribs. By convention, the human thoracic vertebrae are numbered T1 -- T12, with the first one ( T1 ) located closest to the skull and the others going down the spine toward the lumbar region. Contents 1 General characteristics 2 Individual thoracic vertebrae 2.1 First thoracic vertebra ( T1 ) 2.2 Second thoracic vertebra ( T2 ) 2.3 Third thoracic vertebra ( T3 ) 2.4 Fourth thoracic vertebra ( T4 ) 2.5 Fifth thoracic vertebra ( T5 ) 2.6 Sixth thoracic vertebra ( T6 ) 2.7 Seventh thoracic vertebra ( T7 ) 2.8 Eighth thoracic vertebra ( T8 ) 2.9 Ninth thoracic vertebra ( T9 ) 2.10 Tenth thoracic vertebra ( T10 ) 2.11 Eleventh thoracic vertebra ( T11 ) 2.12 Twelfth thoracic vertebra ( T12 ) 3 Other animals 4 Additional images 5 See also 6 References 7 External links General characteristics These are the general characteristics of the second through eighth thoracic vertebrae. The first and ninth through twelfth vertebrae contain certain peculiarities, and are detailed below. The bodies in the middle of the thoracic region are heart - shaped and as broad in the anteroposterior as in the transverse direction. At the ends of the thoracic region they resemble respectively those of the cervical and lumbar vertebrae. They are slightly thicker behind than in front, flat above and below, convex from side to side in front, deeply concave behind, and slightly constricted laterally and in front. They present, on either side, two costal demi - facets, one above, near the root of the pedicle, the other below, in front of the inferior vertebral notch ; these are covered with cartilage in the fresh state, and, when the vertebrae are articulated with one another, form, with the intervening intervertebral fibrocartilages, oval surfaces for the reception of the heads of the ribs. Thoracic vertebrae The pedicles are directed backward and slightly upward, and the inferior vertebral notches are of large size, and deeper than in any other region of the vertebral column. The laminae are broad, thick, and imbricated -- that is to say, they overlap those of subjacent vertebrae like tiles on a roof and connect with the pedicles to surround and protect the spinal cord. The intervertebral foramen is small, and circular, with two at each intervertebral level, one for the right and one for the left exiting nerve roots. The vertebral foramen is the large opening posterior to the vertebral body also known as the spinal canal. It contains and protects the spinal cord at the thoracic level. The spinous process is long, triangular on coronal section, directed obliquely downward, arising from the lamina and ending in a tuberculated extremity. These processes overlap from the fifth to the eighth, but are less oblique in direction above and below. The superior articular processes are thin plates of bone projecting upward from the junctions of the pedicles and laminae ; their articular facets are practically flat, and are directed backward and a little lateralward and upward. The inferior articular processes are fused to a considerable extent with the laminae, and project but slightly beyond their lower borders ; their facets are directed forward and a little medialward and downward. The transverse processes arise from the arch behind the superior articular processes and pedicles ; they are thick, strong, and of considerable length, directed obliquely backward and lateralward, and each ends in a clubbed extremity, on the front of which is a small, concave surface, for articulation with the tubercle of a rib. Individual thoracic vertebrae The first and ninth through twelfth thoracic vertebra have some peculiarities First thoracic vertebra ( T1 ) The first thoracic vertebra has, on either side of the body, an entire articular facet for the head of the first rib, and a demi - facet for the upper half of the head of the second rib. The body is like that of a cervical vertebra, being broad, concave, and lipped on either side. The superior articular surfaces are directed upward and backward ; the spinous process is thick, long, and almost horizontal. The transverse processes are long, and the upper vertebral notches are deeper than those of the other thoracic vertebrae. The thoracic spinal nerve 1 ( T1 ) passes out underneath it. Second thoracic vertebra ( T2 ) The thoracic spinal nerve 2 ( T2 ) passes out underneath it. The second thoracic vertebra is larger than the first thoracic vertebra Third thoracic vertebra ( T3 ) The thoracic spinal nerve 3 ( T3 ) passes out underneath it. Fourth thoracic vertebra ( T4 ) The fourth thoracic vertebra, together with the fifth, is at the same level as the sternal angle. The thoracic spinal nerve 4 ( T4 ) passes out underneath it. A thoracic spine X-ray of a 57 - year - old male. Surface orientation of T3 and T7, at middle of spine of scapula and at inferior angle of the scapula, respectively. Fifth thoracic vertebra ( T5 ) The fifth thoracic vertebra, together with the fourth, is at the same level as the sternal angle. The human trachea divides into two main bronchi at the level of the 5th thoracic vertebra, but may also end higher or lower, depending on breathing. The thoracic spinal nerve 5 ( T5 ) passes out underneath it. Sixth thoracic vertebra ( T6 ) The thoracic spinal nerve 6 ( T6 ) passes out underneath it. Seventh thoracic vertebra ( T7 ) The thoracic spinal nerve 7 ( T7 ) passes out underneath it. Eighth thoracic vertebra ( T8 ) The eighth thoracic vertebra is, together with the ninth thoracic vertebra, at the same level as the xiphisternum. The thoracic spinal nerve 8 ( T8 ) passes out underneath it. Ninth thoracic vertebra ( T9 ) The ninth thoracic vertebra may have no demi - facets below. In some subjects however, it has two demi - facets on either side ; when this occurs the tenth does n't have facets but demi - facets at the upper part. The thoracic spinal nerve 9 ( T9 ) passes out underneath it. The xiphisternum ( or xiphoid process of the sternum ) is at the same level in the axial plane. Tenth thoracic vertebra ( T10 ) The tenth thoracic vertebra has an entire articular facet ( not demi - facet ) on either side, which is placed partly on the lateral surface of the pedicle. It does n't have any kind of facet below, because the following ribs only have one facet on their heads. The thoracic spinal nerve 10 ( T10 ) passes out underneath it. Eleventh thoracic vertebra ( T11 ) In the eleventh thoracic vertebra the body approaches in its form and size to that of the lumbar vertebrae. The articular facets for the heads of the ribs are of large size, and placed chiefly on the pedicles, which are thicker and stronger in this and the next vertebra than in any other part of the thoracic region. The spinous process is short, and nearly horizontal in direction. The transverse processes are very short, tuberculated at their extremities, and do not have articular facets. The thoracic spinal nerve 11 ( T11 ) passes out underneath it. Twelfth thoracic vertebra ( T12 ) The twelfth thoracic vertebra has the same general characteristics as the eleventh, but may be distinguished from it by its inferior articular surfaces being convex and directed lateralward, like those of the lumbar vertebrae ; by the general form of the body, laminae, and spinous process, in which it resembles the lumbar vertebrae ; and by each transverse process being subdivided into three elevations, the superior, inferior, and lateral tubercles : the superior and inferior correspond to the mammillary and accessory processes of the lumbar vertebrae. Traces of similar elevations are found on the transverse processes of the tenth and eleventh thoracic vertebrae. The thoracic spinal nerve 12 ( T12 ) passes out underneath it. Other animals In other animals the number of thoracic vertebrae can vary greatly ; for example, most marsupials have 13, but koalas have only 11. 12 to 15 is common among mammals, with 18 to 20 in horses, tapirs, rhinoceroses, and elephants, and extremes in mammals are marked by certain sloths with 25 and cetaceans with 9. Additional images Position of thoracic vertebrae. Animation. Same as the left, but bones around the thoracic vertebrae are shown as semi-transparent. Animation showing the shape of thoracic vertebrae. Lateral surface of the thoracic vertebrae. Right half of the thoracic skeleton is not shown. Vertebral column. Vertebral column. Vertebral arches of three thoracic vertebrae viewed from the front. Section of the costotransverse joints from the third to the ninth inclusive. A typical thoracic vertebra, viewed from above. A thoracic vertebra, viewed from above. A thoracic vertebra, viewed from below. See also Costovertebral articulations Vertebral column Cervical vertebrae Lumbar vertebrae References This article incorporates text in the public domain from page 102 of the 20th edition of Gray 's Anatomy ( 1918 ) Jump up ^ The thoracic vertebrae were historically called dorsal vertebrae ; cf. ( 1 ). Especially due to the free copying of old public domain versions of Gray 's Anatomy, the old term may still be encountered, however the old term is long obsolete and misleading, as the dorsum refers to the whole back and not just the thoracic part of the back. 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 External links Wikimedia Commons has media related to Thoracic vertebrae. Interactive tool to identify parts thoraxbones at The Anatomy Lesson by Wesley Norman ( Georgetown University ) Photos at University of Utah SpineUniverse anatomical diagram Spinal nerves Cervical C1 C2 C3 C4 C5 C6 C7 C8 anterior Cervical plexus Brachial plexus posterior Posterior branches of cervical nerves Suboccipital -- C1 Greater occipital -- C2 Third occipital -- C3 Thoracic T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 anterior Intercostal Intercostobrachial -- T2 Thoraco - abdominal nerves -- T7 -- T11 Subcostal -- T12 posterior Posterior branches of thoracic nerves Lumbar L1 L2 L3 L4 L5 anterior Lumbar plexus Lumbosacral trunk posterior Posterior branches of the lumbar nerves Superior cluneal L1 -- L3 Sacral S1 S2 S3 S4 S5 anterior Sacral plexus posterior Posterior branches of sacral nerves Medial cluneal nerves Coccygeal anterior Coccygeal plexus posterior Posterior branch of coccygeal nerve 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 Anatomy portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Thoracic_vertebrae&oldid=853957764 '' Categories : Wikipedia articles incorporating text from the 20th edition of Gray 's Anatomy ( 1918 ) Bones of the thorax Bones of the vertebral column Hidden categories : Pages with unresolved properties All articles with unsourced statements Articles with unsourced statements from November 2016 Talk Contents About Wikipedia Bân - lâm - gú Bosanski Brezhoneg Català Deutsch Eesti Español Esperanto فارسی Français 한국어 Italiano Lietuvių Македонски Bahasa Melayu Nederlands नेपाल भाषा Polski Português Русский Svenska 中文 14 more Edit links This page was last edited on 8 August 2018, at 01 : 25 ( UTC ). About Wikipedia

Question: where is t1 and t2 located on the spine
Answer: closest to the skull