2Bones of the Foot Basic Facts: There are 26 bones in each human foot. Makes up one quarter of the entire (208 bones) human body.2 in the hind foot or rear foot5 in the midfoot19 in the forefoot2 ancillary bones underneath the first metatarsal head.
3Medial View of Foot Midfoot Navicular, cuneiforms (3) and cuboid Courtesy of Gray’s Anatomy, Lateral view, fig. #290Rear foot/Hind footTalus and calcaneusForefootMetatarsals (5) and phalanges (14)
4Lateral View of the foot MidfootCourtesy of Gray’s Anatomy, Lateral view, fig. #291ForefootHind foot/Rear foot
5Dorsal viewThe 5 metatarsal bones are made up of three main parts—the base, the shaft and the head.The base is at the proximal end.The shaft is in the middle.The heads are located at the distal ends of the bones. The heads are the weight bearing portion of the foot.The metatarsals are numbered 1-5 beginning with the great toe, or hallux.
6Sesamoids Located on the plantar side of the great toe (hallux). Identified by the location on the foot-- tibial (medial) and fibular (lateral) sesamoids.Flexor hallucis longus tendon runs between them.The tendon is responsible for abducting and adducting great toe.
7Posterior view of ankle Ankle BonesPosterior view of ankleTibiaMedial malleolus (tibia)Lateral malleolus (fibula)Talus (slightly displaced)Calcaneus5
8Circulatory System There are three types of blood vessels: Arteries-carries blood away from the heartVeins-transfers blood back to the heart from the capillariesCapillaries-connect arteries to veins
9Posterior Tibial Artery The posterior tibial artery is found on the medial side of the ankle and can be palpated.
10Dorsalis Pedis ArteryThe dorsalis pedis artery can be palpated on the dorsum of the foot between the first and second ray.
11SkinThe human skin is the bodies largest organ and made up of multiple layers. The top layer of skin, called the epidermis, plays a very important role in protecting the body against the environment. Other functions include insulation, temperature regulation and sensation.
12Skin Skin is divided into 3 main layers: Epidermis-outermost layer; visibleDermis-layer underneath epidermisHypodermis- also called the subcutaneous tissue, used for fat storage.The thickness of the skin at the soles (and palms) is 1.5 mm at the epidermis layer.
13JointsA joint is the area where two or more bones are attached for the purpose of motion of human body parts.A joint is usually formed of fibrous connective tissue and cartilage.There are 33 joints in the human foot.They allow the foot to move in many directions and adapt to many surfaces.The joints are shock absorbers.Definition provided by
14JointsThe metarso-phalangeal joint (MTP) is between the metatarsals and the phalanges (toes).Hinge joints that allow mostly plantar and dorsiflexion and also allow the toes to maintain contact with the ground during push off.
15JointsThe proximal interphalangeal joint (PIP) is between the proximal and middle phalanges.The distal interphalangeal joint (DIP) is found only on phalanges 2-5.
16Joints The ankle joint is composed of the fibula, tibia and talus. A hinge joint that allows the foot to pull up (dorsiflex) and move downward (plantarflex).Anterior viewPosterior view
17JointsThe transverse tarsal joint is comprised of two joints—the talonavicular and calcaneocuboid (TNCC joint).Also known as the midtarsal or chopart’s joint
18JointsThe tarsometatarsal joint is made up of the tarsals and metatarsals.Also known as the Lisfranc Joint.
19Joints The subtalar joint is between the talus and calcaneus. Also known as the talocalcaneal joint.Acts as a screw-shaped joint and is the primary joint that allows the foot to turn in (inversion) or turn outward (eversion)Posterior view
20BursaeBursae, or singular bursa, fluid filled sacs commonly located just proximal to insertion of tendon into bone; reduce friction that would otherwise occur as tendon moves against bone
21Muscles and TendonsMuscles are attached to tendons which insert to the bones of the foot and toes.Most muscles that move the foot originate from the calf (posterior) or shin (anterior) area.Tendons are a band of fibrous tissue that attach muscles to the bones.When a muscle contracts, it pulls on the tendon.One of the most prominent tendons is the Achilles tendon, which can be felt on the back of the foot, just above the heel.Tendons can be torn or ruptured and inflammation is the most prevalent.
22MusclesThe gastrocenimus and soleus muscle combine to form the Achilles tendon.This allows the ankle and foot to push down (plantar flex).
23Achilles tendonMost important tendon for walking, running and jumping.Attached the calf muscle to the calcaneus.Allows us to plantar flex.The strongest and thickest tendon.