Leg Flashcards
The leg has how many compartments?
3: posterior, deep, & anterior
*What is the extension of crural fascia to fibula, separating anterior and lateral compartments?
- anterior intermuscular septum
- posterior intermuscular septum
- deep transverse fascia
- interosseous membrane
- anterior intermuscular septum
*What is the extension of crural fascia to fibula, separating lateral and posterior compartments?
- anterior intermuscular septum
- posterior intermuscular septum
- deep transverse fascia
- interosseous membrane
- posterior intermuscular septum
*What passes across the calf from the fibula to the tibia, subdividing the posterior compartment into superficial and deep layers?
- anterior intermuscular septum
- posterior intermuscular septum
- deep transverse fascia
- interosseous membrane
- deep transverse fascia
*What is between the shafts of the tibia and fibula, which provides areas for muscle attachments?
- anterior intermuscular septum
- posterior intermuscular septum
- deep transverse fascia
- interosseous membrane
- interosseous membrane
Posterior compartment has what muscles in the superficial (3) and deep (4) compartments?
Superficial (triceps surae):
- gastrocnemius
- soleus
- plantaris
Deep:
- poplieus
- flexor digitorum longus
- flexor hallucis longus
- tibialis posterior
Gastrocnemius
O:
I:
O: medial & lateral head:
posterior superior to medial & lateral condyles of femur
I: posterior surface of calcaneous via calcaneal tendon
Gastrocnemius
Innerv:
Function:
Innervation: tibial n.
Function:
- plantarflexes ankle (most effective when knee is extended)
- raises heel during walking
- flexes leg at knee
Soleus
O:
I:
O: head & proximal surface of fibula; soleal line of tibia
I: posterior surface of calcaneus via calcaneal tendon
Soleus
Innerv:
Function:
Innerv: tibial n.
Function:
- plantarflexes ankle
- steadies leg on foot in weightbearing (WIDE m.)
Tendons of the deep posterior compartment run deep to what?
flexor retinaculum
Popliteus
O:
I:
O: lateral aspect of lateral condyle of femur, lateral meniscus
I: posterior surface of tibia, superior to soleal line
Popliteus
Innerv:
Function
Innerv: tibial n.
Function:
- weakly flexes knee
- unlocks knee (external rotation of femur on fixed tibia)
Flexor digitorum longus
Innerv:
Function:
Innerv: tibial n.
Function:
- flexes digits 2-5
- plantarflexes ankle
Tibialis posterior
O:
O: interosseous membrane
Tibialis posterior
Innerv:
Functions:
Innerv: tibail n.
Function:
- plantarflexes ankle
- inverts foot
Flexor hallucis longus
O:
O: inferior 2/3 of posterior fibula & interosseous membrane
Flexor hallucis longus
Innerv:
Functions:
Innver: tibial n.
Function:
- flexes great toe
- plantarflexes ankle
- supports medial longitudinal arch (passive tension)
Where does the tibial n. and the posterior tibial vessels run?
between the deep and superficial group of muscles, deep to the transverse intermuscular septums
In the sole of the foot, what does the tibial nerve become?
medial and lateral plantar nerves
What nerve travels superficially with small saphenous vein (in the posterior leg) & provides cutaneous innervation to the posterolateral leg & lateral leg?
sural n.
The popliteal artery becomes what artery in the posterior leg?
posterior tibial a.
The posterior tibial a. divides in the foot to become what arteries?
medial & lateral plantar branch a.
The fibular a. comes off what a.?
posterior tibial a.
The posterior tibial a. runs with what n.?
tibial n.
