Anatomy lecture 27-10-2008 Anterior and lateral compartment of leg

Bones of leg Bones of leg: Tibia fibula

Muscles of the anterior leg Tibialis anterior Extensor digitorum longus Extensor hallucis longus Peroneus tertius

Anterior leg Cross section of anterior leg

Origin: Tibialis anterior Insertion: Nerve: Action: Shaft of the tibia interosseous membrane Insertion: Medial cuneiform and base of First metatarsal. Nerve: Deep peroneal nerve Action: Extend the foot Help to maintain the medial longitudinal Arch of foot

Extensor digitorum longus Origin: Shaft of fibula Interosseous membrane Insertion: Extensor expansion of latral four toes Nerve: deep peroneal nerve Action: Extends toes

Extensor hallucis longus Origin: Shaft of fibula Interosseous membrane Insertion: base of distal phalanx Of big toe Nerve: Deep peroneal nerve Action: Extend big toe Dorsoiflexes foot

Peroneus tertius muscle Origin Shaft of fibula Interosseous membrane Insertion: Base of fifth metatarsal Nerve: Deep peroneal nerve Action: Dorsiflexes foot Evertion at subtalar and tarsal joint

Innervations and blood supply of anterior leg Deep peroneal nerve Is a branch from Common peroneal nerve. Anterior tibial artery is a branch of popliteal artery

Muscles of the lateral leg Peroneus longus Peroneus brevis

Peroneus longus muscle Origin: Shaft of fibula Insertion: Base of first metatarsal Medial cuneiform Nerve: Superficial peroneal nerve Action: Planter flexes,eversion of foot Support lateral longitudinal arch This the only muscle which crosses The planter surface to maintain Transverse arch of foot

Peroneus brevis muscle Origin: Shaft of fibula Insertion: Base of fifth metatarsal Bone Nerve : Superficial peroneal nerve Action: Planter flexes foot Hold up lateral longtidunal arch

Thank you thankyou Dr. kumar Dr. mashair Associate professor instructor thankyou