Posterior leg muscles Flashcards
1
Q
Gastrocnemius
* origin
* insertion
* action
* innervation
A
- origin: lateral epicondyle of the femur; medial epicondyle of the femur
- insertion: tuber calcanei (via calcaneal tendon)
- action: plantarflexion of foot when leg is extended; flexion of leg
- innervation: tibial nerve
2
Q
Soleus
* origin
* insertion
* action
* innervation
A
- origin: posterior fibula; soleal line of tibia
- insertion: tuber calcanei (via calcaneal tendon)
- action: plantarflexion of the foot (independent of leg extension);
high percentage of slow-twitch fibres - innervation: tibial nerve
3
Q
Plantaris
* origin
* insertion
* action
* innervation
A
- origin: lateral supracondylar line of femur
- insertion: tuber calcanei (via calcaneal tendon)
- action: (weak) plantarflexion of the foot
- innervation: tibial nerve
4
Q
Popliteus
* origin
* insertion
* action
* innervation
A
- origin: lateral femoral epicondyle
- insertion: proximal, posterior tibia
- action: flexion of leg; internal rotation of leg “unlocks knee”
- innervation: tibial nerve
5
Q
Flexor hallucis longus
* origin
* insertion
* action
* innervation
A
- origin: posterior fibula; interosseous membrane
- insertion: inferior surface of first distal phalanx
- action: flexion of digit 1 of the foot; plantarflexion of foot; inversion of foot
- innervation: tibial nerve
6
Q
Flexor digitorum longus
* origin
* insertion
* action
* innervation
A
- origin: posterior tibia (body)
- insertion: inferior surfaces of distal phalanges of toes (2-5)
- action: flexion of toes 2-5; plantarflexion of foot; inversion of foot
- innervation: tibial nerve
7
Q
Tibialis posterior
* origin
* insertion
* action
* innervation
A
- origin: posterior fibula; posterior tibia; interosseous membrane
- insertion: lateral cuneiform bone; intermediate cuneiform bone; medial cuneiform bone; tuberosity of navicular bone
- action: plantarflexion of foot; inversion of foot; major role in supporting medial arch
- innervation: tibial nerve
