Anterior Crural Muscles

Question 1

Extensor digitorum longus

Answer 1

(L4-S1)

attachments- from the lateral tibial condyle, proximal 3/4th of the fibula and crural interosseous membrane to the dorsal digital expansions of toes 2-5

actions- dorsiflexes ankle, and extends digits 2-5 (IP & MP)

innervation- deep fibular nerve

Question 2

Extensor hallucis longus

Answer 2

(L4-S1)

attachments- from the middle 1/2 of the fibular surface & crural interosseous membrane to the distal phalangeal base of the 1st toe

actions- dorsiflexes ankle, and extends great toe (MP & IP)

innervation- deep fibular nerve

Question 3

Fibularis (peroneus) tertius

Answer 3

(L4-S1)

attachments- from the distal fibula and crural interosseous membrane to the base of the 5th metatarsal

actions- dorsiflexes ankle, and everts foot

innervation- deep fibular nerve

Question 4

Tibialis anterior

Answer 4

(L4-S1)

attachments- from the lateral tibial condyle and proximal 2/3rds of the lateral surface tibia & crural interosseous membrane to the medial cuneiform & adjacent 1st metatarsal

actions- dorsiflexes ankle, and inverts foot

innervation- deep fibular nerve