Anatomy Muscles 175-200
Terms
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- Extensor Hallucis origin and insertion
- origin: Anteromedial fibula shaft and interosseous membrane; insertion: Tendon inserts on distal phalanx of great toe
- Peroneus Longus action
- Plantar flexes and everts foot; helps keep foot flat on ground
- Peroneus Longus innervation
- Superficial peroneal nerve
- Peroneus Tertius origin and insertion
- origin: Distal anterior surface of fibula and interosseous membrane; insertion: Tendon passes anterior to lateral malleolus and inserts on dorsum of fifth metatarsal
- Extensor Hallucis action
- Extends great toe; dorsiflexes foot
- Extensor Hallucis innervation
- Deep peroneal nerve
- Extensor Digitorum Longus origin and insertion
- origin: Lateral condyle and proximal ¾ of fibula; interosseous membrane; insertion: Second and third phalanges of toes 2-5 via extensor expansion
- Peroneus Tertius action
- Dorsiflexes and everts foot
- Peroneus Tertius innervation
- Deep peroneal nerve
- Tibialis Anterior origin and insertion
- origin: Lateral condyle and upper 2/3 of tibia; interosseous membrane; insertion: By tendon into inferior surface of medial cuneiform and first metatarsal bone
- Extensor Digitorum Longus action
- Dorsiflexes foot; prime mover of toe extension (acts mainly at metatarsophalangeal joints)
- Extensor Digitorum Longus innervation
- Deep peroneal nerve
- Semimembranosus origin and insertion
- origin: Ischial tuberosity; insertion: Medial condyle of tibia
- Tibialis Anterior action
- Prime mover of dorsiflexion; inverts foot; assists in supporting medial longitudinal arch of foot
- Tibialis Anterior innervation
- Deep peroneal nerve
- Semitendinosus origin and insertion
- origin: Ischial tuberosity in common with long head of biceps femoris; insertion: Medial aspect of upper tibial shaft
- Semimembranosus action
- Extends thigh and flexes knee; medially rotates leg
- Semimembranosus innervation
- Sciatic nerve
- Biceps Femoris origin and insertion
- origin: Ischial tuberosity (long head); Linea aspera and distal femur (short head); insertion: Common tendon passes downward and laterally (forming lateral border of popliteal fossa) to insert into head of fibula and lateral condyle of tibia
- Semitendinosus action
- Extends thigh at hip; flexes knee; with semimembranosus, medially rotates leg
- Semitendinosus innervation
- Sciatic nerve
- Tensor Fasciae Latae origin and insertion
- origin: Anterior aspect of iliac crest and anterior superior iliac spine; insertion: Iliotibial tract
- Biceps Femoris action
- Extends thigh and flexes knee; laterally rotates leg, especially when knee is flexed
- Biceps Femoris innervation
- Sciatic nerve
- Vastus Intermedius origin and insertion
- origin: Anterior and lateral surfaces of proximal femur shaft; insertion: As for rectus femoris