Muscles of the Lower Extremity: Anterior (Extensor) Compartment of the Leg

Question 1

Tibialis Anterior Proximal Attachment

Answer 1

Proximal half of the lateral surface of the tibia and interosseus membrane

Question 2

Tibialis Anterior Distal Attachment

Answer 2

Medial cuneiform and base of metatarsal I

Question 3

Tibialis Anterior Innervation

Answer 3

Deep fibular n. [*L4,L5]

Question 4

Tibialis Anterior Action

Answer 4

Dorsiflexes the ankle

Inverts the foot

Question 5

Extensor Hallucis Longus (EHL) Proximal Attachment

Answer 5

Middle of the anterior surface of the fibula and interosseous membrane

Question 6

Extensor Hallucis Longus (EHL) Distal Attachment

Answer 6

Base of the distal phalanx of the great toe

Question 7

Extensor Hallucis Longus (EHL) Innervation

Answer 7

Deep fibular n. [L5,S1]

Question 8

Extensor Hallucis Longus (EHL) Action

Answer 8

Extends MTP & IP joints of the great toe
Assists with:
-Dorsiflexion of the ankle
-Inversion of the foot

Question 9

Extensor Digitorum Longus (EDL) Proximal Attachment

Answer 9

Proximal 3/4 of the anterior fibula and interosseus membrane

Question 10

Extensor Digitorum Longus (EDL) Distal Attachment

Answer 10

Middle and distal phalanges of digits II-V (via extensor hoods)

Question 11

Extensor Digitorum Longus (EDL) Innervation

Answer 11

Deep fibular n. [L5,S1]

Question 12

Extensor Digitorum Longus (EDL) Action

Answer 12

Extends MTP, PIP, & DIP joints of lateral 4 toes
Assists with:
-Dorsiflexion of the ankle
-Eversion of the foot