Set 8 Muscles Lower Leg

Gastrocnemius

Gastrocnemius Origin: Insertion: Action: LATERAL HEAD – Lateral condyle and posterior surface of femur; capsule of knee joint MEDIAL HEAD – Medial condyle and adjacent part of femur; capsule of knee joint posterior surface of calcaneus by means of calcaneal tendon (Achilles tendon) plantar flexion and inversion of foot

Tibialis anterior

Tibialis anterior Origin: Insertion: Action: lateral condyle of tibia, proximal 2/3 of lateral surface of tibia plantar surface of base of first metatarsal and medial plantar surface of first tarsal dorsiflexes and inverts foot at ankle

Gluteus minimus

Gluteus minimus Origin: Insertion: Action: outer surface of ilium between anterior and inferior gluteal lines anterior border of greater trochanter (femur) abducts hip and rotates medially; lateral pelvic stabilizer

Flexor hallucis longus

Flexor hallucis longus Origin: Insertion: Action: Distal 2/3 of posterior surface of fibula Plantar surface of base of distal phalanx of big toe (hallux) Flexes big toe; aids in plantar flexion and inversion of foot; gives medial ankle stability

Flexor digitorum longus

Flexor digitorum longus Origin: Insertion: Action: Posterior surface of middle 3/5 of tibia Divides into 4 tendons that insert on the plantar surfaces of bases of distal phalanx of the 2nd – 5th toes Flexes phalanges of 2nd – 5th toes; plantar flexes and inverts foot

Extensor hallucis longus

Extensor hallucis longus Origin: Insertion: Action: Middle ½ of the anterior surface of the fibula and the adjacent interosseous membrane Dorsal surface of base of distal phalanx of big toe (hallux) Extends big toe; aids in dorsiflexion and inverts foot

Extensor digitorum longus

Extensor digitorum longus Origin: Insertion: Action: Lateral condyle of tibia, proximal ¾ of anterior surface of fibula Divides into four tendons and inserts on middle and distal phalanx of 2nd – 5th toes Extends phalanges of toes 2-5; dorsiflexes and everts foot

Fibularis (Peroneus) longus

Fibularis (Peroneus) longus Origin: Insertion: Action: Head and proximal 2/3 of lateral surface of fibula Lateral margin of plantar surface of 1st tarsal and metatarsal Plantar flexion and eversion of foot; gives lateral ankle stability

Soleus

Soleus Origin: Insertion: Action: upper 1/3 fibula; middle 1/3 of tibia on calcaneous with gastrocnemius by way of Achilles tendon Plantar flexion and inversion of foot