Each foot is comprised of 26 bones, 30 joints and more than 100 muscles, tendons and also ligaments, every one of which work-related together to carry out support, balance and mobility. Here"s a look in ~ the key structures the the feet.
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Nearly one-fourth the the body's bones room in our feet. The skeletal of the feet are:Talus – the bone on height of the foot that develops a joint with the two bones of the lower leg, the tibia and also fibula.Calcaneus – the biggest bone the the foot, which lies beneath the talus to type the heel bone.Tarsals – five irregularly shame bones of the midfoot that type the foot's arch. The tarsal bones are the cuboid, navicular and also medial, intermediate and lateral cuneiforms.Metatarsals – five bones (labeled one through five, starting with the big toe) that comprise the forefoot.Phalanges (singular: phalanx) – the 14 skeletal that consist of the toes. The huge toe consists of 2 phalanges – the distal and also proximal. The various other toes have three.Sesamoids – two small, pea-shaped bones that lie beneath the head the the first metatarsal in the ball of the foot.
Joints in the feet are developed wherever 2 or more of these bones meet. Except for the large toe, each of the toes has actually three joints, which include:Metatarsophalangeal share (MCP) – the joint at the basic of the toeProximal interphalangeal joint (PIP) – the share in the center of the toeDistal phalangeal joint (DP) – the joint closest to the reminder of the toe.
Each huge toe has two joints:Metatarsophalangeal jointInterphalangeal joint
The surfaces of the bones whereby they accomplish to form joints are covered through a layer of cartilage, which allows them to glide smoothly versus one an additional as lock move. The joints space enclosed by a fibrous capsule that is lined with a slim membrane referred to as the synovium, i m sorry secretes a liquid to lubricate the joints.
Twenty muscles provide the foot the shape, support and the capability to move. The main muscles that the foot include the:Tibilias posterior, which support the foot's archTibilias anterior, which permits the foot to move upwardTibilias peroneal, i m sorry controls activity on the external of the ankleExtensors, which aid raise the toes, do it possible to take a stepFlexors, which help stabilize the toes.
Tendons and Ligaments
Many tendons attach these muscle to the bones and ligaments that hold the bones with each other to preserve the foot's arch.
The main tendon that the foot is the Achilles tendon, which runs from the calf muscle to the heel. The Achilles tendon renders it feasible to run, jump, rise stairs and stand on your toes.
The main ligaments that the foot are:Plantar fascia – the longest ligament of the foot. The ligament, i beg your pardon runs along the sole of the foot, from the hoe to the toes, forms the arch. By stretching and also contracting, the plantar fascia helps united state balance and gives the foot stamin for walking.Plantar calcaneonavicular ligament – a ligament of the sole of the foot the connects the calcaneus and navicular and also supports the head that the talus.Calcaneocuboid ligament – the ligament the connects the calcaneus and the tarsal bones and helps the plantar fascia support the arch the the foot.
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