Anterior And Lateral Compartment Of Leg Flashcards
Anterior intramuscular septum
Connect the deep fascia with the anterior border of the fibula
Posterior inter muscular septum
Connects the deep fascia with posterior border of the fibula
Deep fascia doesn’t completely encircle the leg, where does it extend?
From anterior surface of tibia, around the leg, to the medial border of the tibia.
Muscles of the anterior compartment of leg (4)
Tibialis anterior, Extensor Digitorum Longus, Extensor hallucis longus, Fibularis tertius.
Where do anterior leg muscles arise?
From fibula, except from tibialis anterior which arises from tibia.
What nerve supplies the anterior compartment of leg?
Deep fibular nerve
Action of muscles of anterior compartment of leg?
Dorsi flexion of the foot at ankle joint.
Tibialis anterior origin and insertion.
Superior 2/3 of the lateral surface of the tibia (and lateral condyle) and adjacent interosseous membrane to medial cuneiform and base of 1st metatarsal bone.
Tibialis anterior action and innervation
DEEP FIBULAR NERVE, Dorsiflexion of foot at ankle joint and inversion of foot at subtalar and midtarsal joints.
Extensor digitorum longus origin and insertion.
Superior 3/4ths of anterior surface of fibula -lt condyleand adjacent interosseus membrane to (via 4 tendons) extensor expansion covering back of proximal phalanx and is attached to the bases of lateral 4 middle and distal phalanges.
Extensor digitorum longus action and innervation
Extension of lateral toes, dorsiflexion
Extensor hallucis longus origin and insertion
Middle 2/4ths of anterior surface of the fibula and adjacent interosseus membrane to dorsal surface of the base of distal phalanx of the big toe.
Extensor hallucis longus
Extension of all joints of big toe and dorsiflexion of foot at ankle joint.
Fibularis tertius origin and insertion
Lower 1/4th of anterior surface of fibula to base of fifth metatarsal bone.
Fibularis tertius action and innervation
Dorsiflexion of foot at ankle joint, assist in eversion of foot at subtalar and midtarsal joints, deep fibular nerve.
Anterior tibial artery origin
Inferior border of popliteus muscle
Anterior tibial artery course
Inferior border of popliteus muscle, through interosseus membrane to reach anteriorcompartment.
Descends on the interosseus membrane in the superior one third of the leg, between tibialis anterior muscle (medially ) and extensor digitorum muscle (laterally). In the middle 1/3 of leg lies between tibialis anterior muscle (medially) and extensor hallucis longus muscle (laterally). Inferior one third it is crossed by the extensor hallucis longus at the ankle joint, and it lies between extensor hallucis longus (medially) and extensor digitorum muscle (laterally).
Deep fibular nerve
Superior 1/3 lateral to anterior tibial artery
Middle 1/3 anterior to artery
Lower 1/3 lateral to the artery
Anterior tibial artery continuation
Dorsal is pedis artery in front of the ankle joint underneath extensor retinaculum
Anterior tibial artery branch on posterior aspect of leg
Posterior tibial recurrent artery (supplying the back of the knee joint)
Anterior tibial artery branch on anterior leg
Anterior tibial recurrent branch (skin of the knee joint)
Anterior tibial artery branches
Posterior tibial recurrent (post knee joint) Anterior tibial recurrent (skin of knee) Muscular branches (anterior compartment) Anterior medial malleollar artery Anterior lateral malleolar artery
Deep fibular nerve course
Branch of common fibular nerve (one of 2 terminal branches)- within Fibularis longus - on lateral aspect of the neck of fibula
Pierces anterior inter muscular septum to reach anterior compartment
Passes through upper part of extensor digitorum longus
Descends on the interosseus membrane (with the anterior tibial artery)
Lateral/anterior/lateral to arterial artery
Runs anterior to ankle joint to reach dorsal surface of the foot
Deep fibular nerve branches
To muscles of the anterior compartment :tibialis anterior, extensor hall long, ext digit long and Fibularis tertius
Lateral compartment of leg contents
Muscles- Fibularis longus and brevis
Superficial fibular nerve
Perforating branches from fibular artery
Fibularis longus origin and insertion
Superior 2/3 of lateral surface of fibula to medial cuneiform and base of the 1st metatarsal
Fibularis longus action and innervation
Superficial fibular nerve,
- eversion of foot at subtalar and midtarsal joints
- plantarflexion of foot at ankle joint
- maintains transverse and lateral longitudinal arches of foot.
Fibularis brevis origin and insertion
Inferior 2/3 of lateral surface of fibula to base of 5th metatarsal
Fibularis brevis action and innervation
Superficial fibular nerve
Eversion of foot at subtalar and midtarsal joints
Plantarflexion f foot at ankle joint
Support of lateral longitudinal arch of foot
Superficial fibular nerve course
Terminal branch of common fibular nerve on lateral side of neck of the fibula.
Superior 3rd- descends in the substance of Fibularis longus
Middle 3rd- emerges from Fibularis longus to lie between it and Fibularis brevis
Lower 3rd of leg pierces deep fascia to descend in the superficial fascia
Crossing superficial to the extensor retinaculum to enter the dorsum of the foot
Divides into medial and lateral termina branches
SuPERFICIAL fibular nerve branches
Muscular branches to fibularis longus and brevis
Cutaneous branches to the inferior 1/3 of the lateral surface of the leg
Cutaneous branches of all dorsal surface of toes (except lateral side of 5th toe- sural nerve and between 1 and 2nd toe-deep fibular nerve)
Medial and lateral terminal branches
Fibular artery perforating branches (
Supply lateral compartment of the leg
