Muscles of the Ankle and Foot Flashcards
O: Proximal half of the lateral tibial shaft, Interosseous membrane
I: Metatarsal I, Medial cuneiform
TIBIALIS ANTERIOR (FIG. 21.92)
A: Dorsiflexes the ankle, Inverts the foot
N: Deep fibular nerve
O: Fibular head (longus), Proximal two-thirds of the anterior fibular shaft (longus), Lateral condyle of the tibia (longus), Anterior surface of the interosseous membrane (longus), Calcaneus (brevis)
I: Middle phalanges of digits Il through V (longus), Distal phalanges of digits Il through V (longus), Tendons of extensor digitorum longus to digits Il through IV (brevis)
EXTENSOR DIGITORUM LONGUS AND BREVIS (FIG. 21.93)
A: Extends digits Il through V (longus), Dorsiflexes the ankle (longus), Everts the foot (longus), Extends digits Il through IV (brevis)
N: Deep fibular nerve (longus and brevis)
O: Anterior fibular shaft (middle region), Interosseous membrane,
I: Distal phalanx of the great toe
EXTENSOR HALLUCIS LONGUS (FIG. 21.94)
A: Extends the great toe, Dorsiflexes the ankle
N: Deep fibular nerve
O: Fibular head, Lateral proximal half of the fibular shaft
I: Metatarsal I, Medial cuneiform
FIBULARIS LONGUS (FIG 21.95)
A: Everts the foot, Plantarflexes the ankle
N: Superficial fibular nerve
O: Lateral distal half of the fibular shaft,
I: Metatarsal V
FIBULARIS BREVIS (FIG. 21.96)
A: Everts the foot, Plantarflexes the ankle
N: Superficial fibular nerve
O: Lateral distal third of the fibular shaft, Interosseous membrane,
I: Metatarsal V
FIBULARIS TERTIUS (FIG. 21.97)
A: Everts the foot, Dorsiflexes the ankle
N: Deep fibular nerve
O: Medial epicondyle of the femur (medial head), Lateral epicondyle of the femur (lateral head),
I: Calcaneus via the Achilles tendon
GASTROCNEMIUS (FIG. 21.98)
A: Plantarflexes the ankle, Flexes the knee
N: Tibial nerve
O: Lateral epicondyle of the femur,
I: Calcaneus via the Achilles tendon (distal portion)
PLANTARIS (FIG. 21.99), Latin: planta-sole, O: Lateral epicondyle of the femur,
I: Calcaneus via the Achilles tendon (distal portion)
A: Plantarflexes the ankle, Flexes the knee
N: Tibial nerve
O: Superior posterior third of the fibular shaft, Soleal line of the tibia,
I: Calcaneus via the Achilles tendon
SOLEUS (FIG. 21.100), Latin: solea-sole of the foot or sandal, O: Superior posterior third of the fibular shaft, Soleal line of the tibia,
I: Calcaneus via the Achilles tendon, ACTION, Plantarflexes the ankle
N: Tibial nerve
O: Posterior tibial shaft, Posterior fibular shaft, Interosseous membrane
I: Plantar surfaces of most tarsals (navicular, cuneiforms, cuboid, and calcaneus), Bases of metatarsals II, Ill, and IV
TIBIALIS POSTERIOR (FIG. 21.101)
A: Inverts the foot, Plantarflexes the ankle
N: Tibial nerve
O: Posterior tibial shaft—middle region
I: Distal phalanges of digits I| through V (plantar surface)
FLEXOR DIGITORUM LONGUS (SEE FIG. 21.101
A: Flexes digits Il through V at the DIP, PIP, and MTP joints, Plantarflexes the ankle, Inverts the foot
N: Tibial nerve
O: Posterior fibular shaft —middle region, Interosseous membrane
I: Distal phalanx of the great toe (plantar surface)
FLEXOR HALLUCIS LONGUS (SEE FIG. 21.101)
A: Hexes the great toe, Plantarflexes the ankle, Inverts the foot, Supports the longitudinal arch
N: Tibial nerve
Plantar Flexion of the foot and ankle.
Gastrocnemius, Soleus, Plantaris, Fibularis longus, Fibularis brevis, Tibialis posterior, Flexor digitorum longus, Flexor hallucis longus
Dorsiflexion of the foot and ankle.
Tibialis anterior, Extensor hallucis longus, Fibularis tertius, Extensor digitorum longus
Inversion of the foot and ankle.
Tibialis anterior, Tibialis posterior, Flexor digitorum longus, Flexor hallucis longus
Eversion of the foot and ankle.
Fibularis longus, Fibularis brevis, Fibularis tertius, Extensor digitorum longus
