Anterior compartment of leg- muscles

Question 1

Origin of tibialis anterior?

Answer 1

Tibia (upper two thirds of the lateral surface), interosseous membrane, and superficial crural fascia (highest part)

Question 2

Insertion of tibialis anterior?

Answer 2

Medial cuneiform (medial sand plantar surface), first metatarsal (medial base)

Question 3

Innervation of tibialis anterior?

Answer 3

Deep fibular n.

L4, L5

Question 4

Action of tibialis anterior?

Answer 4

Talocrural joint: dorsiflexion

Subtalar joint: inversion (supination)

Question 5

Origin of extensor hallucis longus?

Answer 5

Fibula (middle third of the medial surface) interosseous membrane

Question 6

Insertion of extensor hallucis longus?

Answer 6

1st toe (at the dorsal aponeurosis and the base of its distal phalanx)

Question 7

Innervation of extensor hallucis longus?

Answer 7

Deep fibular n.

L4, L5

Question 8

Origin of extensor digitorum longus?

Answer 8

Fibula (head and medial surface), tibia (lateral condyle), and interosseous membrane

Question 9

Insertion of extensor digitorum longus?

Answer 9

2nd to 5th toes (at the dosrsal aponeuroses at the bases of the distal phalanges)

Question 10

Innervation of extensor digitorum longus?

Answer 10

Deep fibular n.

L4, L5

Question 11

Action of extensor digitorum longus?

Answer 11

Talocrural joint: dorsiflexion
Subtalar joint: eversion (pronation)
Extends the MTP and IP joints of the 2nd to 5th toes

Question 12

Origin of fibularis tertius? (peroneus tertius)

Answer 12

Distal fibula (anterior border)

Question 13

Insertion of fibularis tertius? (peroneus tertius)

Answer 13

5th metatarsal (base)

Question 14

Innervation of fibularis tertius?

Answer 14

Deep fibular n.

L4, L5

Question 15

Action of fibularis tertius?

Answer 15

Talocrural joint: dorsiflexion

Subtalar joint: eversion (pronation)

Question 16

Action of extensor hallucis longus?

Answer 16

Talocural joint: dorsiflexion
Subtalar joint: active in both eversion and inversion (pronation/supination), depending on the intial position of the foot
Extends the MTP and IP joints of the big toe