Muscles of the dorsal aspect of the foot

Question 1

Extensor digitorum brevis

Answer 1

Origin:

• Superolateral surface of the calcaneus

Insertion:

• Lateral sides of the tendons of extensor digitorum longs of toes Ii to IV

Innervation:

• Deep fibular nerve (S1, S2)

Function:

• Extension of toes II to IV

Question 2

Extensor hallucis brevis

Answer 2

Origin:

• Superolateral surface of calcaneus

Insertion:

• Base of proximal phalanx of great toe

Innervation:

• Deep fibular nerve (S1, S2)

Function:

• Extension of metatarsophalangeal joint of great toe