PT 662 Ankle Muscles

Question 1

Tibialis anterior m.

Answer 1

Lateral condyle and superior 2/3 of lateral surface of tibia
Medial and inferior surfaces of medial cuneiform and base of 1st metatarsal
Deep Fibular nerve
L4, L5
Ankle dorsiflexion, foot inversion, medial longitudinal arch support

Question 2

Extensor hallucis longus m.

Answer 2

Middle part of anterior surface of fibula
Dorsal aspect of base of distal phalanx of great toe (hallux)
Deep Fibular nerve
L5, S1
Great toe extension, ankle dorsiflexion

Question 3

Extensor digitiorum longus m.

Answer 3

Lateral condyle of tibia and superior 2/3 of fibula
Medial and distal phalanges of lateral four digits
Deep Fibular Nerve
L5, S1
Extension of lateral four digits, ankle dorsiflexion

Question 4

Fibularis tertius

Answer 4

Inferior 1/3 of anterior surface of fibula
Dorsum of base of 5th metatarsal
Deep fibular nerve
L5,S1
Dorsiflexes ankle; aids in eversion of foot

Question 5

Fibularis longus m.

Answer 5

Head and superior 2/3 of lateral surface of fibula
Base of 1st metatarsal and medial cuneiform
Superficial Fibular nerve
L5, S1, S2
Foot eversion, weak ankle plantarflexor, supports transverse longitudinal arch

Question 6

Fibularis brevis m.

Answer 6

Middle part of lateral surface of fibula
Dorsal surface of tuberosity on lateral side of base of 5th metatarsal
Superficial Fibular nerve
L5, S1, S2
Foot eversion, weak ankle plantarflexor

Question 7

Gastrocnemius m.

Answer 7

Lateral Head: Lateral aspect of lateral condyle of femur; Medial head: Popliteal surface of femur, and superior medial condyle
Posterior surface of calcaneus via calcaneal (Achilles) tendon
Tibial nerve
S1, S2
Ankle plantarflexion, assists in knee flexion, raises heel while walking

Question 8

Soleus m.

Answer 8

Posterior aspect of head of fibula, superior fourth of posterior surface of fibula, soleal line and medial border of tibia
Posterior surface of calcaneus via calcaneal (Achilles) tendon
Tibial nerve
S1, S2
Ankle plantarflexion, steadies leg in foot

Question 9

Plantaris m.

Answer 9

Inferior end of lateral supracondylar line of femur and oblique popliteal ligament
Posterior surface of calcaneus via calcaneal tendon
Tibial nerve
S1-S2
Weakly assists gastrocnemius in plantarflexing ankle; mainly proprioceptive

Question 10

Flexor hallucis longus m.

Answer 10

inferior 2/3 of posterior surface of fibula
Base of distal phalanx of great toe (hallux)
Tibial nerve
S2, S3
Great toe flexion, weak plantarflexion

Question 11

Flexor digitorum longus

Answer 11

medial part of posterior surface of tibia inferior to soleal line and by a broad tendon to fibula
Bases of distal phalanges of lateral four digits
Tibial nerve
S2, S3
Flexion of lateral four digits, ankle plantarflexion, supports lateral longitudinal arch

Question 12

Tibialis posterior m.

Answer 12

Posterior surface of tibia inferior to soleal line, and posterior surface of fibula
Primarily tuberosity of navicular, cuneiforms, cuboids, and bases of 2-4 metatarsals
Tibial nerve
L4, L5
Ankle plantarflexion, foot inversion, supports medial longitudinal arch