Posterior Crural Muscles Flashcards
Flexor digitorum longus - Attachments
FROM:
*posterior tibia distal to the soleal line
TO:
*plantar surface of the distal phalangeal bases
Flexor digitorum longus - Actions
*plantar flexes ankle
*flexes digits 2-5 (MP & IP)
Flexor digitorum longus - Innervation
tibial nerve (L5-S2)
Flexor hallucis longus - Attachments
FROM:
*distal 2/3rds of the posterior fibular surface
*crural interosseous membrane
TO:
*plantar aspect of the distal phalangeal base of the 1st toe
Flexor hallucis longus - Actions
*plantar flexes ankle
*flexes great toe (MP & IP)
Flexor hallucis longus - Innervation
tibial nerve (L5-S2)
Gastrocnemius - Attachments
FROM:
*posterior aspect of the femoral condyles
*joint capsule
TO:
*posterior calcaneal surface
Gastrocnemius - Actions
*flexes knee
*plantar flexes ankle
Gastrocnemius - Innervation
tibial nerve (S1-S2)
Plantaris - Attachments
FROM:
*lateral supracondylar line
TO:
*posterior calcaneal surface
Plantaris - Actions
*flexes knee
*plantar flexes ankle
Plantaris - Innervation
tibial nerve (L4-S1)
Popliteus - Attachments
FROM:
*lateral femoral condyle
*oblique popliteal ligament
TO:
*soleal line of the tibia
Popliteus - Actions
*In NWB, medial rotation of tibia and knee flexion
*in WB insertion is fixed: lateral rotation of femur and knee flexion; thus, it unlocks the knee from extension into early flexion
Popliteus - Innervation
tibial nerve (L4-S1)
Soleus - Attachments
FROM:
*posterior aspect of the head of fibula
*proximal 1/4th of the fibula
*tibial soleal line
TO:
*posterior calcaneal surface
Soleus - Actions
plantar flexes the foot at the ankle joint
Soleus - Innervation
tibial nerve (L5-S2)
Tibialis posterior - Attachments
FROM:
*crural interosseous membrane
*lateral tibial surface
*medial fibular surface
TO:
*navicular, medial & intermediate cuneiforms
*bases of metatarsals 2-4
Tibialis posterior - Actions
*inverts foot
*plantar flexes ankle
Tibialis posterior - Innervation
tibial nerve (L4-S1)
