Muscles of Posterior Compartment of Leg Flashcards
Main action of the gastrocnemius?
- Plantar flexes ankle
- Flexes leg at knee
Name the superficial muscles of posterior compartment of the leg?
- Gastrocnemius
- Soleus
- Plantaris
Main action of the soleus?
- Plantar flexes ankle
- Steadies leg on foot
Main action of the plantaris?
Assists gastrocnemius in plantar flexion & flexion of leg at knee
Innervation of superficial muscles of posterior compartment of leg?
Tibial n.
Proximal attachment of the gastrocnemius?
- Lat. head:
- Lat. condyle of femur - Med. head:
- Popliteal surface of femur
Distal attachment of the gastrocnemius?
Post. surface of calcaneus
Proximal attachment of the soleus?
Post. aspect of head of fibula
Distal attachment of soleus?
Post. surface of calcaneus
Proximal attachment of the plantaris?
Inf. end of lat. supracondylar line of femur
Distal attachment of plantaris?
Post. surface of calcaneus
Name the deep muscles of the posterior compartment of the leg?
- Popliteus
- Flexor hallucis longus
- Flexor digitorum longus
- Tibialis posterior
Main action of the popliteus?
- Weakly flexes knee
- Unlocks knee
Main action of the flexor hallucis longus?
- Flexes big toe
- Weakly plantar flexes ankle
Main action of the flexor digitorum longus?
- Flexes lat. 4 digits
- Plantar flexes ankle
Main action of the tibialis posterior?
- Plantar flexes ankle
- Inverts foot
Innervation of deep muscles of posterior compartment of leg?
Tibial n.
Proximal attachment of the popliteus?
Lat. surface of lat. condyle of femur
Distal attachment of popliteus?
Post. surface of tibia (sup. to soleal line)
Proximal attachment of the flexor hallucis longus?
Inf. 1/2 of post. surface of fibula
- Interosseous membrane
Distal attachment of flexor hallucis longus?
Base of distal phalange of big toe
Proximal attachment of the flexor digitorum longus?
Med. part of post. surface of tibia (inf. to soleal line)
Distal attachment of the flexor digitorum longus?
Base of distal phalanges of lat. 4 digits
Proximal attachment of the tibialis posterior?
- Post. surface of tibia (inf. to soleal line)
- Interosseous membrane
- Post. surface of fibula
Distal attachment of tibialis posterior?
- Tuberosity of cuboid, navicular & cuneiform
- Base of 2nd, 3rd & 4th metatarsals
