Week 7 Muscles - Superficial Posterior Leg

Superficial Posterior Leg what muscles

gastrocnemius, soleus, plantaris

Gastrocnemius medial head origin

popliteal surface of femur, superior to medial condyle

Gastrocnemius lateral head origin

lateral aspect of lateral condyle of femur

Gastrocnemius insertion

posterior surface of calcaneus via calcaneal tendon

Gastrocnemius innervation

tibial nerve (S1-S2)

Gastrocnemius blood supply

posterior tibial artery

Gastrocnemius action

plantarflex ankle, participates in knee flexion

Gastrocnmius purposeful activity

jumping

Gastrocnemius what twitch

fast twitch; jumping

Soleus origin

posterior aspect of head of fibula, superior quarter of posterior surface of fibula, soleol line, and medial border of tibia

Soleus insertion

posterior surface of calcaneus via calcaneal tendon

Soleus innervation

tibial nerve (S1, S2)

Soleus blood supply

posterior tibial artery

Soleus action

plantarflex ankle, important postural muscle

Soleus purposeful activity

posture and balance

Soleus what twitch

slow twitch; postural balance

Plantaris origin

lateral supracondylar line

Plantaris insertion

posterior surface calcaneus via calcaneal(isolated tendon, does not join achilles)

Plantaris innervation

tibial nerve (S1, S2)

Plantaris blood supply

popiteal artery

Plantaris action

possibly plantarflexion and proprioceptive function

Plantaris purposeful activity

running