Foot - wikipedia Foot This article is about the anatomical structure. For the unit of measure, see Foot ( unit ). For other uses, see Foot ( disambiguation ). Foot Details Artery dorsalis pedis, medial plantar, lateral plantar Nerve medial plantar, lateral plantar, deep fibular, superficial fibular Identifiers Latin Pes MeSH A01. 378.610. 250 Dorlands / Elsevier Foot TA A01. 1.00. 040 FMA 9664 Anatomical terminology ( edit on Wikidata ) The foot ( plural feet ) is an anatomical structure found in many vertebrates. It is the terminal portion of a limb which bears weight and allows locomotion. In many animals with feet, the foot is a separate organ at the terminal part of the leg made up of one or more segments or bones, generally including claws or nails. Contents 1 Etymology 2 Structure 2.1 Bones 2.2 Arches 2.3 Muscles 2.3. 1 Extrinsic 2.3. 2 Intrinsic 3 Clinical significance 4 Pronation 5 Society and culture 6 Other animals 7 Metaphorical and cultural usage 8 See also 9 References 10 External links Etymology The word `` foot '', in the sense of meaning the `` terminal part of the leg of a vertebrate animal '' comes from `` Old English fot `` foot, '' from Proto - Germanic * fot ( source also of Old Frisian fot, Old Saxon fot, Old Norse fotr, Danish fod, Swedish fot, Dutch voet, Old High German fuoz, German Fuß, Gothic fotus `` foot '' ), from PIE root * ped - `` foot. '' The `` ( p ) lural form feet is an instance of i - mutation. '' Structure The feet of a newborn infant. The human foot is a strong and complex mechanical structure containing 26 bones, 33 joints ( 20 of which are actively articulated ), and more than a hundred muscles, tendons, and ligaments. The joints of the foot are the ankle and subtalar joint and the interphalangeal articulations of the foot. An anthropometric study of 1197 North American adult Caucasian males ( mean age 35.5 years ) found that a man 's foot length was 26.3 cm with a standard deviation of 1.2 cm. The foot can be subdivided into the hindfoot, the midfoot, and the forefoot : The hindfoot is composed of the talus ( or ankle bone ) and the calcaneus ( or heel bone ). The two long bones of the lower leg, the tibia and fibula, are connected to the top of the talus to form the ankle. Connected to the talus at the subtalar joint, the calcaneus, the largest bone of the foot, is cushioned underneath by a layer of fat. The five irregular bones of the midfoot, the cuboid, navicular, and three cuneiform bones, form the arches of the foot which serves as a shock absorber. The midfoot is connected to the hind - and fore - foot by muscles and the plantar fascia. The forefoot is composed of five toes and the corresponding five proximal long bones forming the metatarsus. Similar to the fingers of the hand, the bones of the toes are called phalanges and the big toe has two phalanges while the other four toes have three phalanges each. The joints between the phalanges are called interphalangeal and those between the metatarsus and phalanges are called metatarsophalangeal ( MTP ). Both the midfoot and forefoot constitute the dorsum ( the area facing upwards while standing ) and the planum ( the area facing downwards while standing ). The instep is the arched part of the foot between the toes and the ankle. Bones Illustration of bones in lower leg and foot. tibia, fibula tarsus ( 7 ) : talus, calcaneus, cuneiformes ( 3 ), cuboid, and navicular metatarsus ( 5 ) : first, second, third, fourth, and fifth metatarsal bone phalanges ( 14 ) There can be many sesamoid bones near the metatarsophalangeal joints, although they are only regularly present in the distal portion of the first metatarsal bone. Arches Main article : Arches of the foot The human foot has two longitudinal arches and a transverse arch maintained by the interlocking shapes of the foot bones, strong ligaments, and pulling muscles during activity. The slight mobility of these arches when weight is applied to and removed from the foot makes walking and running more economical in terms of energy. As can be examined in a footprint, the medial longitudinal arch curves above the ground. This arch stretches from the heel bone over the `` keystone '' ankle bone to the three medial metatarsals. In contrast, the lateral longitudinal arch is very low. With the cuboid serving as its keystone, it redistributes part of the weight to the calcaneus and the distal end of the fifth metatarsal. The two longitudinal arches serve as pillars for the transverse arch which run obliquely across the tarsometatarsal joints. Excessive strain on the tendons and ligaments of the feet can result in fallen arches or flat feet. Muscles The muscles acting on the foot can be classified into extrinsic muscles, those originating on the anterior or posterior aspect of the lower leg, and intrinsic muscles, originating on the dorsal ( top ) or plantar ( base ) aspects of the foot. Extrinsic Anterior leg muscles. All muscles originating on the lower leg except the popliteus muscle are attached to the bones of the foot. The tibia and fibula and the interosseous membrane separate these muscles into anterior and posterior groups, in their turn subdivided into subgroups and layers. Anterior group Extensor group : tibialis anterior originates on the proximal half of the tibia and the interosseous membrane and is inserted near the tarsometatarsal joint of the first digit. In the non-weight - bearing leg tibialis anterior flexes the foot dorsally and lift its medial edge ( supination ). In the weight - bearing leg it brings the leg towards the back of the foot, like in rapid walking. Extensor digitorum longus arises on the lateral tibial condyle and along the fibula to be inserted on the second to fifth digits and proximally on the fifth metatarsal. The extensor digitorum longus acts similar to the tibialis anterior except that it also dorsiflexes the digits. Extensor hallucis longus originates medially on the fibula and is inserted on the first digit. As the name implies it dorsiflexes the big toe and also acts on the ankle in the unstressed leg. In the weight - bearing leg it acts similar to the tibialis anterior. Peroneal group : peroneus longus arises on the proximal aspect of the fibula and peroneus brevis below it on the same bone. Together, their tendons pass behind the lateral malleolus. Distally, peroneus longus crosses the plantar side of the foot to reach its insertion on the first tarsometatarsal joint, while peroneus brevis reaches the proximal part of the fifth metatarsal. These two muscles are the strongest pronators and aid in plantar flexion. Longus also acts like a bowstring that braces the transverse arch of the foot. Deep and superficial layers of posterior leg muscles Posterior group The superficial layer of posterior leg muscles is formed by the triceps surae and the plantaris. The triceps surae consists of the soleus and the two heads of the gastrocnemius. The heads of gastrocnemius arise on the femur, proximal to the condyles, and soleus arises on the proximal dorsal parts of the tibia and fibula. The tendons of these muscles merge to be inserted onto the calcaneus as the Achilles tendon. Plantaris originates on the femur proximal to the lateral head of the gastrocnemius and its long tendon is embedded medially into the Achilles tendon. The triceps surae is the primary plantar flexor and its strength becomes most obvious during ballet dancing. It is fully activated only with the knee extended because the gastrocnemius is shortened during knee flexion. During walking it not only lifts the heel, but also flexes the knee, assisted by the plantaris. In the deep layer of posterior muscles tibialis posterior arises proximally on the back of the interosseous membrane and adjoining bones and divides into two parts in the sole of the foot to attach to the tarsus. In the non-weight - bearing leg, it produces plantar flexion and supination, and, in the weight - bearing leg, it proximates the heel to the calf. flexor hallucis longus arises on the back of the fibula ( i.e. on the lateral side ), and its relatively thick muscle belly extends distally down to the flexor retinaculum where it passes over to the medial side to stretch across the sole to the distal phalanx of the first digit. The popliteus is also part of this group, but, with its oblique course across the back of the knee, does not act on the foot. Intrinsic On the back ( top ) of the foot, the tendons of extensor digitorum brevis and extensor hallucis brevis lie deep to the system of long extrinsic extensor tendons. They both arise on the calcaneus and extend into the dorsal aponeurosis of digits one to four, just beyond the penultimate joints. They act to dorsiflex the digits. Plantar aspects of foot, varying depths ( superficial to deep ) Similar to the intrinsic muscles of the hand, there are three groups of muscles in the sole of foot, those of the first and last digits, and a central group : Muscles of the big toe : abductor hallucis stretches medially along the border of the sole, from the calcaneus to the first digit. Below its tendon, the tendons of the long flexors pass through the tarsal canal. It is an abductor and a weak flexor, and also helps maintain the arch of the foot. flexor hallucis brevis arises on the medial cuneiform bone and related ligaments and tendons. An important plantar flexor, it is crucial for ballet dancing. Both these muscles are inserted with two heads proximally and distally to the first metatarsophalangeal joint. Adductor hallucis is part of this group, though it originally formed a separate system ( see contrahens. ) It has two heads, the oblique head originating obliquely across the central part of the midfoot, and the transverse head originating near the metatarsophalangeal joints of digits five to three. Both heads are inserted into the lateral sesamoid bone of the first digit. Adductor hallucis acts as a tensor of the plantar arches and also adducts the big toe and then might plantar flex the proximal phalanx. Muscles of the little toe : Stretching laterally from the calcaneus to the proximal phalanx of the fifth digit, abductor digiti minimi form the lateral margin of the foot and is the largest of the muscles of the fifth digit. Arising from the base of the fifth metatarsal, flexor digiti minimi is inserted together with abductor on the first phalanx. Often absent, opponens digiti minimi originates near the cuboid bone and is inserted on the fifth metatarsal bone. These three muscles act to support the arch of the foot and to plantar flex the fifth digit. Central muscles of foot Central muscle group : The four lumbricals arise on the medial side of the tendons of flexor digitorum longus and are inserted on the medial margins of the proximal phalanges. Quadratus plantae originates with two slips from the lateral and medial margins of the calcaneus and inserts into the lateral margin of the flexor digitorum tendon. It is also known as flexor accessorius. Flexor digitorum brevis arise inferiorly on the calcaneus and its three tendons are inserted into the middle phalanges of digits two to four ( sometimes also the fifth digit ). These tendons divide before their insertions and the tendons of flexor digitorum longus pass through these divisions. Flexor digitorum brevis flexes the middle phalanges. It is occasionally absent. Between the toes, the dorsal and plantar interossei stretch from the metatarsals to the proximal phalanges of digits two to five. The plantar interossei adducts and the dorsal interossei abducts these digits and are also plantar flexors at the metatarsophalangeal joints. Clinical significance Main article : Diseases of the foot Due to their position and function, feet are exposed to a variety of potential infections and injuries, including athlete 's foot, bunions, ingrown toenails, Morton 's neuroma, plantar fasciitis, plantar warts and stress fractures. In addition, there are several genetic disorders that can affect the shape and function of the feet, including a club foot or flat feet. This leaves humans more vulnerable to medical problems that are caused by poor leg and foot alignments. Also, the wearing of shoes, sneakers and boots can impede proper alignment and movement within the ankle and foot. For example, High - heeled footwear are known to throw off the natural weight balance ( this can also affect the lower back ). For the sake of posture, flat soles with no heels are advised. A doctor who specializes in the treatment of the feet practices podiatry and is called a podiatrist. A pedorthist specializes in the use and modification of footwear to treat problems related to the lower limbs. Fractures of the foot include : Lisfranc fracture -- in which one or all of the metatarsals are displaced from the tarsus Jones fracture -- a fracture of the fifth metatarsal March fracture -- a fracture of the distal third of one of the metatarsals occurring because of recurrent stress Calcaneal fracture Foot sweat is the major cause of foot odor. Sweat itself is odorless, but it creates a beneficial environment for certain bacteria to grow and produce bad - smelling substances. Pronation Main article : Pronation of the foot In anatomy, pronation is a rotational movement of the forearm ( at the radioulnar joint ) or foot ( at the subtalar and talocalcaneonavicular joints ). Pronation of the foot refers to how the body distributes weight as it cycles through the gait. During the gait cycle the foot can pronate in many different ways based on rearfoot and forefoot function. Types of pronation include neutral pronation, underpronation ( supination ), and overpronation. Neutral pronation An individual who neutrally pronates initially strikes the ground on the lateral side of the heel. As the individual transfers weight from the heel to the metatarsus, the foot will roll in a medial direction, such that the weight is distributed evenly across the metatarsus. In this stage of the gait, the knee will generally, but not always, track directly over the hallux. This rolling inwards motion as the foot progresses from heel to toe is the way that the body naturally absorbs shock. Neutral pronation is the most ideal, efficient type of gait when using a heel strike gait ; in a forefoot strike, the body absorbs shock instead via flexation of the foot. Overpronation As with a neutral pronator, an individual who overpronates initially strikes the ground on the lateral side of the heel. As the individual transfers weight from the heel to the metatarsus, however, the foot will roll too far in a medial direction, such that the weight is distributed unevenly across the metatarsus, with excessive weight borne on the hallux. In this stage of the gait, the knee will generally, but not always, track inwards. An overpronator does not absorb shock efficiently. Imagine someone jumping onto a diving board, but the board is so flimsy that when it is struck, it bends and allows the person to plunge straight down into the water instead of back into the air. Similarly, an overpronator 's arches will collapse, or the ankles will roll inwards ( or a combination of the two ) as they cycle through the gait. An individual whose bone structure involves external rotation at the hip, knee, or ankle will be more likely to overpronate than one whose bone structure has internal rotation or central alignment. An individual who overpronates tends to wear down their running shoes on the medial ( inside ) side of the shoe towards the toe area. When choosing a running or walking shoe, a person with overpronation can choose shoes that have good inside support -- usually by strong material at the inside sole and arch of the shoe. It is usually visible. The inside support area is marked by strong greyish material to support the weight when a person lands on the outside foot and then roll onto the inside foot. Underpronation ( supination ) An individual who underpronates also initially strikes the ground on the lateral side of the heel. As the individual transfers weight from the heel to the metatarsus, the foot will not roll far enough in a medial direction. The weight is distributed unevenly across the metatarsus, with excessive weight borne on the fifth metatarsal, towards the lateral side of the foot. In this stage of the gait, the knee will generally, but not always, track laterally of the hallux. Like an overpronator, an underpronator does not absorb shock efficiently -- but for the opposite reason. The underpronated foot is like a diving board that, instead of failing to spring someone in the air because it is too flimsy, fails to do so because it is too rigid. There is virtually no give. An underpronator 's arches or ankles do n't experience much motion as they cycle through the gait. An individual whose bone structure involves internal rotation at the hip, knee, or ankle will be more likely to underpronate than one whose bone structure has external rotation or central alignment. Usually -- but not always -- those who are bow - legged tend to underpronate. An individual who underpronates tends to wear down their running shoes on the lateral ( outside ) side of the shoe towards the rear of the shoe in the heel area. Society and culture Humans usually wear shoes or similar footwear for protection from hazards when walking outside. There are a number of contexts where it is considered inappropriate to wear shoes. Some people consider it rude to wear shoes into a house and a Māori Marae should only be entered with bare feet. Foot fetishism is the most common form of sexual fetish. Other animals Main article : Comparative foot morphology A paw is the soft foot of a mammal, generally a quadruped, that has claws or nails ( e.g., a cat or dog 's paw ). A hard foot is called a hoof. Depending on style of locomotion, animals can be classified as plantigrade ( sole walking ), digitigrade ( toe walking ), or unguligrade ( nail walking ). The metatarsals are the bones that make up the main part of the foot in humans, and part of the leg in large animals or paw in smaller animals. The number of metatarsals are directly related to the mode of locomotion with many larger animals having their digits reduced to two ( elk, cow, sheep ) or one ( horse ). The metatarsal bones of feet and paws are tightly grouped compared to, most notably, the human hand where the thumb metacarpal diverges from the rest of the metacarpus. Metaphorical and cultural usage Study of a pair of feet crossed, 1847, by Margaret Louisa Herschel, daughter of John Herschel, from the Royal Museums Greenwich The word `` foot '' is used to refer to a ``... linear measure was in Old English ( the exact length has varied over time ), this being considered the length of a man 's foot ; a unit of measure used widely and anciently. In this sense the plural is often foot. The current inch and foot are implied from measurements in 12c. '' The word `` foot '' also has a musical meaning ; a ``... metrical foot ( late Old English, translating Latin pes, Greek pous in the same sense ) is commonly taken to represent one rise and one fall of a foot : keeping time according to some, dancing according to others. '' The word `` foot '' was used in Middle English to mean `` a person '' ( c. 1200 ). The expression ``... to put one 's best foot foremost first recorded 1849 ( Shakespeare has the better foot before, 1596 ) ''. The expression to ``... put one 's foot in ( one 's ) mouth `` say something stupid '' was first used in 1942. The expression `` put ( one 's ) foot in something '' meaning to `` make a mess of it '' is from was used in 1823. The word `` footloose '' was first used in the 1690s, meaning `` free to move the feet, unshackled '' ; the more `` figurative sense of `` free to act as one pleases '' was first used in 1873. Like `` footloose '', `` flat - footed '' at first had its obvious literal meaning ( in 1600, it meant `` with flat feet '' ) but by 1912 it meant `` unprepared '' ( U.S. baseball slang ). See also This article uses anatomical terminology ; for an overview, see Anatomical terminology. Flat feet Foot binding Foot fetishism Foot gymnastics Foot pressure Foot washing Gait analysis Pes cavus Sole ( foot ) Runner 's toe, repetitive injury seen in runners Ball ( anatomy ) Barefoot Heel Squatting position Comparison of orthotics References Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. ^ Jump up to : Podiatry Channel, Anatomy of the foot and ankle Jump up ^ Hawes MR, Sovak D ( July 1994 ). `` Quantitative morphology of the human foot in a North American population ''. Ergonomics. 37 ( 7 ) : 1213 -- 26. PMID 8050406. doi : 10.1080 / 00140139408964899. Jump up ^ Platzer 2004, p. 220 Jump up ^ Mareb - Hoehn 2007, pp. 244 -- 45 Jump up ^ Platzer 2004, p. 256 Jump up ^ Platzer 2004, p. 258 Jump up ^ Platzer 2004, p. 260 Jump up ^ Platzer 2004, p. 262 Jump up ^ Platzer 2004, p. 264 Jump up ^ Platzer 2004, p. 268 Jump up ^ Platzer 2004, pp. 270 -- 72 Jump up ^ Platzer 2004, p. 272 Jump up ^ Platzer 2004, p. 274 Jump up ^ TheFreeDictionary > Lisfranc 's fracture Citing : Mosby 's Medical Dictionary, 8th edition. 2009 Jump up ^ `` Overpronation, Explained ''. Runner 's World. 21 September 2001. Retrieved 28 December 2012. Jump up ^ `` Supination, Explained ''. Runner 's World. 21 September 2001. Retrieved 28 December 2012. Jump up ^ `` Rex Ryan 's Apparent Foot Fetish Not Necessarily Unhealthy ''. Abcnews.go.com. 2010 - 12 - 23. Retrieved 2012 - 08 - 13. Jump up ^ http://www.chaimedia.com/list/197.html Jump up ^ France 2008, p. 537 Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. Jump up ^ `` Foot ''. www.etymonline.com. Online Etymology Dictionary. Retrieved 20 May 2017. Bibliography France, Diane L. ( 2008 ). Human and Nonhuman Bone Identification : A Color Atlas. CRC Press. ISBN 1 - 4200 - 6286 - 7. Marieb, Elaine Nicpon ; Hoehn, Katja ( 2007 ). Human anatomy & physiology. Pearson Education. ISBN 0 - 321 - 37294 - 8. Platzer, Werner ( 2004 ). Color Atlas of Human Anatomy, Vol. 1 : Locomotor System ( 5th ed. ). Thieme. ISBN 3 - 13 - 533305 - 1. `` Anatomy of the foot and ankle ''. Podiatry Channel. Retrieved August 2009. Check date values in : access - date = ( help ) External links Wikimedia Commons has media related to Foot. Look up foot in Wiktionary, the free dictionary. Wikiquote has quotations related to : foot Foot at DMOZ Human regional anatomy Head Ear Face Cheek Chin Eye Mouth Nose Forehead Jaw Occiput Scalp Temple Neck Adam 's apple Throat Trunk Abdomen Waist Midriff Navel Back Thorax Breast Pelvis Sex organs Limbs Arm Shoulder Axilla Brachium Elbow Forearm Wrist Hand Finger Thumb Index Middle Ring Little Leg Buttocks Hip Thigh Knee Calf Foot Ankle Heel Sole Toe Other Écorché General anatomy : systems and organs, regional anatomy, planes and lines, superficial axial anatomy, superficial anatomy of limbs Muscles of the hip and human leg Iliac region Iliopsoas psoas major / psoas minor iliacus Buttocks Gluteal muscles maximus medius minimus tensor fasciae latae lateral rotator group : quadratus femoris inferior gemellus superior gemellus internal obturator external obturator piriformis Thigh / compartments Anterior sartorius quadriceps rectus femoris vastus lateralis vastus intermedius vastus medialis articularis genus Posterior hamstring biceps femoris semitendinosus semimembranosus Medial pectineus external obturator gracilis adductor longus brevis magnus minimus Fascia Femoral sheath Femoral canal Femoral ring Adductor canal Adductor hiatus Muscular lacuna fascia lata Iliotibial tract Lateral intermuscular septum of thigh Medial intermuscular septum of thigh Cribriform fascia Leg / compartments Anterior tibialis anterior extensor hallucis longus extensor digitorum longus peroneus tertius Posterior superficial triceps surae gastrocnemius soleus accessory soleus Achilles tendon plantaris deep tarsal tunnel flexor hallucis longus flexor digitorum longus tibialis posterior popliteus Lateral peroneus muscles longus brevis Fascia Pes anserinus Intermuscular septa anterior posterior transverse Foot Dorsal extensor hallucis brevis extensor digitorum brevis Plantar 1st layer abductor hallucis flexor digitorum brevis abductor digiti minimi 2nd layer quadratus plantae lumbrical muscle 3rd layer flexor hallucis brevis adductor hallucis flexor digiti minimi brevis 4th layer dorsal interossei plantar interossei Fascia Plantar fascia retinacula Peroneal Inferior extensor Superior extensor Flexor Retrieved from `` https://en.wikipedia.org/w/index.php?title=Foot&oldid=801757335 '' Categories : Foot Human body Anatomy Hidden categories : Wikipedia indefinitely move - protected pages Wikipedia indefinitely semi-protected pages Medicine infobox template using Dorlands parameter All articles with unsourced statements Articles with unsourced statements from November 2013 CS1 errors : dates Articles with DMOZ links Talk View source Contents About Wikipedia Wikiquote Afrikaans አማርኛ Ænglisc Aragonés ܐܪܡܝܐ Armãneashti Asturianu Atikamekw Avañe'ẽ Авар Aymar aru Bahasa Banjar Беларуская Български Boarisch Bosanski Brezhoneg Català Čeština ChiShona Corsu Cymraeg Dansk Deutsch ދިވެހިބަސް Eesti Emiliàn e rumagnòl Español Esperanto Euskara فارسی Français Frysk Gàidhlig Galego 𐌲𐌿𐍄𐌹𐍃𐌺 客家 語 / Hak - kâ - ngî 한국어 हिन्दी Hrvatski Ido Bahasa Indonesia Iñupiak Íslenska Italiano עברית ಕನ್ನಡ Қазақша Kreyòl ayisyen Лакку Latina Latviešu Lietuvių Luganda Lumbaart Magyar Македонски മലയാളം मराठी Bahasa Melayu Mìng - dĕ̤ng - ngṳ̄ Nāhuatl Nederlands Nedersaksies नेपाली 日本 語 Napulitano Norsk Norsk nynorsk Occitan ਪੰਜਾਬੀ Pangasinan پنجابی Plattdüütsch Polski Português Ripoarisch Română Runa Simi Русский संस्कृतम् Scots Sicilianu Simple English سنڌي Slovenčina Slovenščina کوردی Српски / srpski Srpskohrvatski / српскохрватски Basa Sunda Suomi Svenska తెలుగు ไทย Тоҷикӣ Türkçe Українська اردو ئۇيغۇرچە / Uyghurche Vahcuengh Tiếng Việt Võro Winaray ייִדיש 粵語 Zazaki 中文 Edit links This page was last edited on 21 September 2017, at 17 : 21. 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Question: what is the curve of your foot called
Answer: arch