The tibialis anterior muscle is a muscle of the anterior compartment of the lower leg. It originates from the upper portion of the tibia; it inserts into the medial cuneiform and first metatarsal bones of the foot. It acts to dorsiflex and invert the foot. This muscle is mostly located near the shin.
|Tibialis anterior muscle|
|Pronunciation||// or //|
|Origin||From the upper 1/2 or 2/3 of the lateral surface of the tibia and the adjacent interosseous membrane|
|Insertion||Medial cuneiform and the base of first metatarsal bone of the foot|
|Artery||Anterior tibial artery|
|Nerve||Deep Fibular (peroneal) nerve (L5)|
|Actions||Dorsiflexion and inversion of the foot|
|Antagonist||Fibularis longus, Gastrocnemius, Soleus, Plantaris, Tibialis posterior|
|Latin||musculus tibialis anterior|
|Anatomical terms of muscle|
It is situated on the lateral side of the tibia; it is thick and fleshy above, tendinous below. The tibialis anterior overlaps the anterior tibial vessels and deep peroneal nerve in the upper part of the leg.
The muslce ends in a tendon which is apparent on the anteriomedial dorsal aspect of the foot close to the ankle. Its tendon is ensheathed in a synovial sheath. The tendon passes through the medial compartment superior and inferior extensor retinacula of the foot.
The tibialis anterior muscle arises from the upper 2/3 of the lateral surface of the tibia and[better source needed] the adjoining part of the interosseous membrane and deep fascia overlying it, and the intermuscular septum between this muscle and the extensor digitorum longus.
Nerve supply Edit
A deep portion of the muscle is rarely inserted into the talus, or a tendinous slip may pass to the head of the first metatarsal bone or the base of the first phalanx of the great toe.
The muscle helps maintain the medial longitudinal arch of the foot. It draws up and holds the toe in a locked position. The tibialis anterior aids in any activity that requires moving the leg or keeping the leg vertical. It functions to stabilize the ankle as the foot hits the ground during the contact phase of walking (eccentric contraction) and acts later to pull the foot clear of the ground during the swing phase (concentric contraction). It also functions to 'lock' the ankle, as in toe-kicking a ball, when held in an isometric contraction.[better source needed]
The movements of tibialis anterior are dorsiflexion and inversion of the ankle. However, actions of tibialis anterior are dependent on whether the foot is weight bearing or not (closed or open kinetic chain). When the foot is on the ground, the muscle helps to balance the leg and talus on the other tarsal bones so that the leg is kept vertical even when walking on uneven ground.
Clinical significance Edit
A tibialis anterior hernia is a rare type of hernia in which fat or other material protrudes through a defect in the tibialis anterior muscle. It may be caused by trauma, such as an inadvertent kick to the lower leg from an opposing player in a football match.
Additional images Edit
medial view of dissected ankle has two muscles
Lateral aspect of right leg.
Tibialis anterior muscle
Cross-section through top third and second third of right leg.
Tibialis anterior muscle
Ankle joint. Deep dissection. Lateral view *This has some structures labelled incorrectly e.g. tibialis anterior, extensor hallucis longus and cuboid bone
See also Edit
- Ma, Yun-tao (2011-01-01), Ma, Yun-tao (ed.), "CHAPTER 14 - General Principles of Treating Soft Tissue Dysfunction in Sports Injuries", Acupuncture for Sports and Trauma Rehabilitation, Saint Louis: Churchill Livingstone, pp. 212–233, doi:10.1016/b978-1-4377-0927-8.00014-2, ISBN 978-1-4377-0927-8, retrieved 2021-03-01
- Sinnatamby, Chummy (2011). Last's Anatomy (12th ed.). Elsevier Australia. p. 144. ISBN 978-0-7295-3752-0.
- Baldry, P. E.; Thompson, John W. (2005-01-01), Baldry, P. E.; Thompson, John W. (eds.), "Chapter 18 - Pain in the lower limb", Acupuncture, Trigger Points and Musculoskeletal Pain (Third Edition), Edinburgh: Churchill Livingstone, pp. 315–324, doi:10.1016/b978-044306644-3.50022-x, ISBN 978-0-443-06644-3, retrieved 2021-03-01
- Uzun, Bora; Taylan, Orçun; Gültekin, Barış; Havıtçıoğlu, Hasan (2011-05-01). "Dynamic measurements of musculus tibialis anterior ligaments with different angles". Journal of Biomechanics. Abstracts of the Fifth International Participated National Biomechanics Congress. 44: 2. doi:10.1016/j.jbiomech.2011.02.021. ISSN 0021-9290.
- Hullur, H.; Salem, Y.; Al Khalifa, J.; Salem, A. (2016). "Tibialis anterior muscle hernia: rare but not uncommon". BMJ Case Reports. 2016: bcr2016217569. doi:10.1136/bcr-2016-217569. PMC 5174854. PMID 27999130.