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Leg and Foot Muscles
superficial and deep leg and foot muscles O/I/A
| Question | Answer |
|---|---|
| Insertion of Tibialis Anterior | Medial side of inferior surface of medial cuneiform & base of 1st metatarsal. |
| Origin of Tibialis Anterior | lateral condyle of tibia, superior 1/2 of lateral surface of tibia |
| Action of Tibialis Anterior | Dorsiflex and inversion, helps to support the medial arch |
| Extensor Digitorum Longus - Origin | lateral condyle of tibia, upper 3/4 of anterior surface of fibula, interosseous membrane where the tendon divides into 4 |
| Extensor Digitorum Longus - Insertion | distal and middle phalanges of toes #2-5 |
| Extensor Digitorum Longus - Action | dorsiflex, extends toes, everts |
| Extensor Hallucis Longus - Origin | middle 1/2 anterior fibula, interosseus membrane |
| Extensor Hallucis Longus - Insertion | distal phalanx of big toe |
| Extensor Hallucis Longus - Action | dorsiflax, extends big toe, inverts foot |
| Peroneus Tertius - Origin | distal 1/3 of anterior surface of fibula, interosseus membrane |
| Peroneus Tertius - Insertion | dorsal surface of bone & proximal shaft of 5th metatarsal in front of malleolus |
| Peroneus Tertius - Action | dorsiflex, eversion, opposes tibialis anterior |
| Peroneus Longus - Origin | head of fibula, , upper 2/3 of lateral surface of fibula |
| Peroneus Longus - Insertion | lateral side of inferior surface of medial cuneiform & base of 1st metatarsal |
| Peroneus Longus - Action | plantar flexion and eversion of the foot |
| Peroneus Brevis - Origin | inferior 2/3 of lateral fibula passes behind lateral malleolus & passes superior to the peroneal tubercle |
| Peroneus Brevis - Insertion | tuberosity of the base of 5th metatarsal |
| Peroneus Brevis - Action | Eversion of the foot, plantarflex |
| Gastrocnemius - Origin | Lateral Head - Lateral epicoondyle of femur Medial Head - posterior femur proximal to medial epicondyle(back and above) |
| Gastrocnemius - Insertion | Calcaneus via achilles/calcaneal tendon |
| Gastrocnemius - Action | Flexes knee & plantarflexes ankle |
| Soleus - Origin | posterior fibula - head and upper 1/4 tibia - soleal line & medial border |
| Soleus - Insertion | Calcaneus via achilles/calcaneal tendon |
| Soleus - Action | plantarflexes ankle, postural muscle |
| Plantaris - Origin | Lateral side, inferior end of supracondylar line, oblique popliteal ligament |
| Plantaris - Insertion | calcaneus |
| Plantaris - Action | Flexes Knee, plantarflexes ankle |
| Popliteus - Origin | Lateral epicondyle of femur |
| Popliteus - Insertion | Posterior Tibia - superior to soleal line |
| Popliteus - Action | flexes knee, unlocks hperextented knee by medially rotating tibia relative to femur |
| Flexor Hallucis Longus - Origin | posterior surface of fibula inferior 2/3, & interosseus membrane |
| Flexor Hallucis Longus - Insertion | Base of distal phalanx - big toe |
| Flexor Hallucis Longus - Action | flexes big toe, plantar flexion, supports medial arch of foot |
| Flexor Digitorum Longus - Origin | Posterior surface of tibia |
| Flexor Digitorum Longus - Insertion | base of distal phalanx of toes #2-5 |
| Flexor Digitorum Longus - Action | flex toes #2-5 plantar flexion, supports longitudinal arch |
| Tibialis Posterior - Origin | interosseous membrane & adjacent tibia/fibula |
| Tibialis Posterior - Insertion | plantar surface of the tuberosity of the navicular, cuboid, cuneiform & bases of metatarsals #2-4, covers entire base of foot |
| Tibialis Posterior - Action | inversion, plantar flexion, maintains arches |
| Extensor Digitorum Brevis - Origin | anterior dorsal surface of calcaneus & inferior extensor retinaculum |
| Extensor Digitorum Brevis - Insertion | proximal phalanx of big toe, blends w tendons of Extensor Digitorum Longus to toes #2-4 |
| Extensor Digitorum Brevis - Action | extends toes #1-4, big toe part can be called extensor hallucis brevis |
| Abductor Hallucis - Origin | medial part of calcaneus, plantar aponeurosis, flexor retinaculum |
| Abductor Hallucis - Insertion | medial side of base of proximal phalanx of big toe |
| Abductor Hallucis - Action | abducts and flexes big toe, supports medial longitudinal arch of the foot |
| Flexor Digitorum Brevis - Origin | inferior surface of tubercalcanei, plantar aponeurosis, divides into 4 tendons |
| Flexor Digitorum Brevis - Insertion | middle phalanges of toes 2-5 both medial and lateral sides (superficial to tendon of flexor digitorum longus) |
| Flexor Digitorum Brevis - Action | flexes toes supports medial and lateral arches |
| Abductor Digiti Minimi - Origin | lateral side of plantar surface of calcaneus and aponeurosis |
| Abductor Digiti Minimi - Insertion | lateral side of base of proximal phalanx of little toe |
| Abductor Digiti Minimi - Action | abducts and flexes little toe, supports lateral longitudinal arch |