Leg Muscles Flashcards
Muscles of Anterior Compartment and innervation
- Tibialis anterior
- Extensor Hallucis Longus
- Extensor Digitorum Longus
- Fibularis Tertius
All innervated by deep fibular nerve
Muscles of Lateral Compartment and innervation
- Fibularis Longus
- Fibularis Brevis
Both innervated by superficial fibular nerve
Muscles of posterior compartment (including deep) and innervation
- Gastrocnemius
- Soleus
- Plantaris
- Flexor Hallucis Longus
- Tibialis Posterior
- Flexor Digitorum Longus
- Popliteus
All innervated by tibial nerve
Origin, insertion, innervation, and action of Tibialis Anterior
Origin: Upper 2/3 of lateral tibia, interosseous membrane and superficial crural fascia.
Insertion: Medial cuneiform and 1st metatarsal
Innervation: Deep fibular Nerve
Action: Dorsiflexion, Inversion
Origin, insertion, innervation, and action of Extensor Hallucis Longus
Origin: Middle, medial surface of fibula and interosseous membrane.
Insertion: 1st (great) toe
Innervation: Deep fibular nerve
Action: Dorsiflexion, extension of 1st (great) toe.
Origin, insertion, innervation, and action of Extensor Digitorum Longus
Origin: Fibular head/anterior border, lateral condyle of tibia and interosseous membrane.
Insertion: 2nd - 5th toes
Innervation: Deep fibular nerve
Action: Dorsiflexion and extension of toes 2-5
Origin, insertion, innervation, and action of Fibularis Tertius
Origin: Distal fibula
Insertion: Base of 5th metatarsal
Innervation: Deep fibular nerve
Action: Assists in dorsiflexion and possible eversion
Origin, insertion, innervation, and action of Fibularis Longus
Origin: Fibular head and proximal 2/3 on lateral side.
Insertion: Medial cuneiform and 1st metatarsal
Innervation: Superficial fibular nerve
Action: Eversion and supports transverse arch of foot.
Origin, insertion, innervation, and action of Fibularis Brevis
Origin: Distal half of lateral surface of fibula and intermuscular septa.
Insertion: 5th metatarsal
Innervation: Superficial fibular nerve
Action: Eversion
Origin, insertion, innervation, and action of Gastrocnemius
Origin: Medial and Lateral condyles of femur
Insertion: Calcaneal tuberosity via Achilles (calcaneal) tendon
Innervation: Tibial Nerve
Action: Plantar flexion and flexion of the knee
Origin, insertion, innervation, and action of Soleus
Origin: Fibular head, neck and posterior surface. Soleal line of tibia.
Insertion: Calcaneal tuberosity via Achilles (calcaneal) tendon
Innervation: Tibial Nerve
Action: Plantar flexion
Origin, insertion, innervation, and action of Plantaris
Origin: Lateral epicondyle of femur
Insertion: Calcaneal tuberosity via Achilles (calcaneal) tendon
Innervation: Tibial nerve
Action: Nothing really. Tendon typically harvested for grafts when needed.
Origin, insertion, innervation, and action of Tibialis Posterior
Origin: Interosseous membrane and adjacent borders of tibia/fibula
Insertion: Navicular tuberosity, all 3 cuneiforms, 2nd - 4th metatarsals
Innervation: Tibial nerve
Action: Inversion and plantar flexion
Origin, insertion, innervation, and action of Flexor digitorum longus
Origin: Middle, posterior surface of tibia
Insertion: 2nd - 5th distal phalanges
Innervation: Tibial nerve
Action: Flexes digits 2 - 5
Origin, insertion, innervation, and action of Flexor hallucis longus
Origin: Distal 2/3 of posterior surface of fibula and interosseous membrane.
Insertion: 1st (great) distal phalanx
Innervation: Tibial nerve
Action: Flexes 1st (great) toe
