Part 7: Dorsum of the Foot

Question 1

What is the cutaneous innervation of the dorsum of the foot?

Answer 1

Mainly superficial peroneal nerve assisted slightly by deep peroneal, saphaneous and sural nerves

Question 2

What is the venous drainage system in the dorsum?

Answer 2

Large veins form dorsal venous arch after receiving blood from IO tributaries in sole. Travels medial to great spahenous vein and lateral to small saphenous vein.

Question 3

Describe the path of superficial peroneal nerve

Answer 3

Surfaces at middle of leg, passing down over peronei. Divides above ankle into medial branch (supplies grt toe and 2nd cleft) and lateral branch (3rd,4th,5th clefts)

Question 4

What nerve supplies the 1st cleft?

Answer 4

Deep peroneal nerve

Question 5

Where does the inferior retinaculum arise?

Answer 5

Anterior surface of upper calcaneous. “Y” shape, two limbs diverge - upper to medial mal and lower blends with plantar aponeurosis. All extensor tendons are enclosed in synovial sheath under inferior retinculum

Question 6

What is the origin, insertion, action and innervation and extensor digitorum brevis?

Answer 6

O: superior surface of anterior calcaneous
I: Extensor expansions of 3rd, 4th and 5th toe. Seperate tendon passes to base of proximal phalanx big toe (extensor hallucis brevis)
A: Extends toes with foot fully dorsiflexed
N: Deep peroneal nerve

Question 7

Describe course of anterior tibial artery in foot

Answer 7

Crosses lower end of tibia midway between malleoli and becomes dorsalis pedis. Runs to base of 1st interMT space. Passes further to sole where it joins lateral plantar artery. Pulse can be found lat to EHL towards first toe cleft. Has 3 branches:
Lateral tarsal artery
Arcuate artery
1s dorsal MT artery

Question 8

What is deep peroneal cause in foot?

Answer 8

Crosses low end of tibia lateral to artery. Passes forward deep to tendons, lateral to DP. Supplies 1st cleft. Also gives branch to supply EDB.