Tibialis posterior muscle
Encyclopedia
The Tibialis posterior is the most central of all the leg
muscle
s, and is located in the posterior compartment of the leg
.
It is the key stabilizing muscle of the lower leg
.
Blood is supplied to the muscle by the posterior tibial artery, and innervation is via the tibial nerve.
and fibula. It is also attached to the interosseous membrane
, which attaches to the tibia and fibula.
The tendon
of tibialis posterior muscle descends posterior to the medial malleolus
and terminates by dividing into plantar, main, and recurrent components. The plantar portion inserts into the bases of the second, third and fourth metatarsals
, the second and third cuneiforms
and the cuboid. The main portion inserts into the tuberosity of the navicular
and the plantar surface of the first cuneiform
. The recurrent portion inserts into the sustentaculum tali
of the calcaneus.
and assists in the plantar flexion
of the foot at the ankle.
Leg
Łęg may refer to the following places in Poland:*A former name for the town of Ełk *Part of the Czyżyny district of Kraków*Łęg, Pleszew County in Greater Poland Voivodeship...
muscle
Muscle
Muscle is a contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to...
s, and is located in the posterior compartment of the leg
Posterior compartment of leg
The posterior compartment of the leg is supplied by the tibial nerve.It contains the plantar flexors:* deep: popliteus, flexor hallucis longus, flexor digitorum longus, tibialis posterior* superficial/calf: gastrocnemius, soleus, plantaris...
.
It is the key stabilizing muscle of the lower leg
Human leg
The human leg is the entire lower extremity or limb of the human body, including the foot, thigh and even the hip or gluteal region; however, the precise definition in human anatomy refers only to the section of the lower limb extending from the knee to the ankle.Legs are used for standing,...
.
Blood is supplied to the muscle by the posterior tibial artery, and innervation is via the tibial nerve.
Origin and insertion
The tibialis posterior muscle originates on the inner posterior borders of the tibiaTibia
The tibia , shinbone, or shankbone is the larger and stronger of the two bones in the leg below the knee in vertebrates , and connects the knee with the ankle bones....
and fibula. It is also attached to the interosseous membrane
Interosseous membrane
An interosseous membrane is a broad and thin plane of fibrous tissue that separates many of the bones of the body. It is an important component of many joints.Interosseous membranes in the human body:* Interosseous membrane of the forearm...
, which attaches to the tibia and fibula.
The tendon
Tendon
A tendon is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension. Tendons are similar to ligaments and fasciae as they are all made of collagen except that ligaments join one bone to another bone, and fasciae connect muscles to other...
of tibialis posterior muscle descends posterior to the medial malleolus
Malleolus
Each leg is supported by two bones, the tibia on the inner side of the leg and the fibula on the outer side of the leg.The medial malleolus is the prominence on the inner side of the ankle, formed by the lower end of the tibia....
and terminates by dividing into plantar, main, and recurrent components. The plantar portion inserts into the bases of the second, third and fourth metatarsals
Metatarsus
The metatarsus or metatarsal bones are a group of five long bones in the foot located between the tarsal bones of the hind- and mid-foot and the phalanges of the toes. Lacking individual names, the metatarsal bones are numbered from the medial side : the first, second, third, fourth, and fifth...
, the second and third cuneiforms
Cuneiform (anatomy)
There are three cuneiform bones in the human foot:* the medial cuneiform* the intermediate cuneiform also known as the middle* the lateral cuneiform...
and the cuboid. The main portion inserts into the tuberosity of the navicular
Navicular bone
The navicular bone is a small bone found in the feet of both humans and horses.- Human anatomy :The navicular bone is one of the tarsal bones, found in the foot. Its name derives from the bone's resemblance to a small boat, caused by the strongly concave proximal articular surface...
and the plantar surface of the first cuneiform
Medial cuneiform bone
The medial cuneiform is the largest of the cuneiforms.It is situated at the medial side of the foot, anterior to the navicular and posterior to the base of the first metatarsal....
. The recurrent portion inserts into the sustentaculum tali
Sustentaculum tali
At the upper and forepart of the medial surface of the calcaneus is a horizontal eminence, the sustentaculum tali , which gives attachment to the plantar calcaneo-navicular ligament, tibiocalcaneal ligament, and medial talocalcaneal ligament.This eminence is concave above, and articulates with the...
of the calcaneus.
Function
As well as being a key muscle/tendon for stabilization, the tibialis posterior muscle also contracts to produce inversion of the footAnatomical terms of location
Standard anatomical terms of location are designations employed in science that deal with the anatomy of animals to avoid ambiguities that might otherwise arise. They are not language-specific, and thus require no translation...
and assists in the plantar flexion
Plantarflexion
Plantarflexion is the movement which increases the approximate 90 degree angle between the front part of the foot and the shin, as when depressing an automobile pedal...
of the foot at the ankle.
