Spaces Of Hand And Forearm

Spaces Of Hand And Forearm

Question 1. What is the dorsal subaponeurotic space? Give it its applied importance.
Answer.

The dorsal subaponeurotic space lies between the aponeurotic sheath and the dorsal surfaces of medial four metacarpals and the dorsal interossei.

On the dorsum of the hand, the extensor tendons of the fingers are bound to one another by oblique bands of deep fascia in such a manner as to form an aponeurotic sheath, which is attached to the borders of the 2nd and 5th metacarpals on the lateral and medial sides, respectively.

Dorsal Subaponeurotic Space Applied Anatomy

The primary infection of this space is due to wounds on the dorsum. The space may be involved secondarily due to infections spreading from midpalmar space via the lymphatics.

Question 2. Give the sensory innervation of the palmar aspect of the hand.
Answer.

• The lateral two-thirds of the palm and the lateral 3½ digits are supplied by the median nerve.
• The medial one-third of the palm and the medial 1½ digits are supplied by the ulnar nerve.