Lecture 16 The Lower Leg EXAM 3

Superficial & intermediate posterior compartment of the leg

gastrocnemius, plantaris, soleus

posterior compartment of leg innervation?

tibial nerve

deep posterior compartment of leg

popliteus, flexor digitorum longus, tibialis posterior, flexor hallucis longus

lateral compartment of the leg

fibularis longus

fibularis brevis

innervation of lateral compartment of leg

superficial fibular (peroneal) nerve

anterior compartment of the leg

tibialis anterior, extensor hallucis longus, extensor digitorum longus, fibularis tertius

popliteal artery branches into?

anterior tibial a.

posterior tibial a. --> peroneal a.

trajectory of the posterior tibial a.?

travels with tibial n

passes deep to flexor retinaculum and divides into medial and lateral plantar aa.

common peroneal n trajectory?

bifurcates into

superficial peroneal n. (inn. peroneus longus and brevis)

deep peroneal n. (inn ant compartment of leg)

Deep peroneal n runs with?

anterior tibial a.

Where is the deep peroneal n. located?

Between tibialis anterior + extensor digitorum longus

function of the retinaculum in the foot/ankle?

prevent bow stringing of tendons that cross the ankle joint by providing reinforcement

flexor retinaculum attachments?

calcaneus and medial malleolus of the tibia

Function of the anterior + posterior ligaments of the head of the fibula?

resists lateral migration of the head of the fibula away from the tibia

the distal and proximal tibiofibular joints are?

mechanically linked!

neck of the talus & posterior process of talus is critical for?

ligament attachment

what does the deltoid/medial collateral ligaments of the ankle joint resist?

valgus forces/hypereversion of the foot

what do the lateral collateral ligaments of the talocrural/ankle joint resist?

varus forces/excessive inversion of the foot