Muscles of the Leg Flashcards
Tibialis Anterior
O:
Proximal 2/3 lateral surface of tibia and interosseus membrane
I:
Base of 1st metatarsal and medial cuneiform
IN:
Deep Peroneal
F:
Strong Invertor and Dorsiflexor
Extensor Digitorum Longus
O:
Proximal 3/4 anterior surface of fibula, lateral tibial condyle, and interosseous membrane
I:
Extensor expansion sheaths of 4 lateral toes
IN:
Deep peroneal nerve
F:
Strong ankle dorsiflexor, Pronation through STJ and MTJ, weak IP ext
Extensor Hallicus Longus
O:
Middle 1/3 anterior surface of fibula and interosseus membrane
I:
Distal phalanx of big toe
IN:
Deep peroneal nerve
F:
Dorsiflexor of big toe, weak dorsiflexor of foot
Extensor Digitorum Brevis
O:
Superior surface of calcaneus
I:
Extensor tendons of Extensor Digitorum Longus for the 2-4 toes
IN:
Deep Peroneal Nerve
F:
Extensor of Toes
Extensor Hallicus Brevis
O:
Medial portion of Extensor Digitorum Brevis
I:
Base of proximal phalange of the big toe
IN:
Deep Peroneal Nerve
F:
Extensor of Big Toe
Peroneus Tertius
O:
Continuous with lateral portion of Extensor Digitorum Longus
I:
Dorsal surface of 5th metatarsal
IN:
Deep peroneal nerve
F:
Weak dorsiflexor and everter of foot
Peroneus Longus
O:
Proximal 2/3 lateral surface of the fibula
I:
Base of the 1st metatarsal and medial cuneiform
IN:
Superficial Peroneal
F:
Strong pronator (STJ, MT-LA)
Stabilize 1st ray
Weak Plantarflexor (TCJ)
Peroneus Brevis
O:
Distal 2/3 lateral surface of the fibula
I:
Base of the fifth metatarsal
IN:
Superficial Peroneal
F: Weak pronator (ST and MT-OA)
Gastrocnemius
O:
Posterior aspect of medial and lateral epicondyles
I:
Becomes tendocalcaneus and inserts onto the posterior portion of calcaneus
IN:
Tibial nerve
F:
Plantarflexor of foot
Knee flexor
Supinator
Soleus
O:
Proximal 1/3 of posterior aspect of tibia (soleal line) and fibula
I:
Deep surface of tendocalcaneus
IN:
Tibial nerve
F:
Plantarflexor of foot (TCJ)
Supinator (STJ)
Plantaris
O:
Lateral femoral condyle (post aspect)
I:
Becomes the tendocalcaneus and inserts onto the the posterior portion of calcaneus
IN:
Tibial
F:
Plantarflexor of foot
knee flexor
Tibialis Posterior
O:
Proximal 2/3 posterior aspect of tibia, fibula, and interosseus membrane
I:
50% on Navicular, 50% on cuneiforms
IN:
Tibial
F:
Strong Supinator (STJ)
Plantarflexor (TCJ)
Flexor Digitorum Longus
O:
Middle 1/2 posterior aspect of tibia, inferior to the soleal line
I:
Splits into 4 brances which insert into the base of the distal phalanges (2-5)
IN:
Tibial
F:
Strong plantar flexor (TCJ)
Supinator (STJ)
Weak MTP flexion
Flexor Hallicus Longus
O:
Distal 2/3 of posterior aspect of interosseus membrane and fibula
I:
Base of the distal 1st phalanx
IN:
Tibial Nerve
F:
Strong plantar flexor (TCJ)
Supinator (STJ)
Weak Hallux Flexion
Popliteus
O:
Lateral femoral epicondyle and meniscus
I:
Proximal 1/3 posterior aspect of tibia
IN:
Tibial
F:
Internal rotator of tibia on femur
Unlocks extended knee
Pulls lateral meniscus posterior with flexion
