The dorsum of the hand and wrist joint (dave's notes)

Question 1

Describe the cutaneous innervation of the dorsum of the hand

Answer 1

the radial nerve 3 1/2 and ulnar nerve 1 1/2 (although can be 2 1/2 each) with the distal phalanges supplied by the median (medial 3 counting thumb) and superficial ulnar (lateral 2)

Question 2

From what and to where do the veins on the dorsum of the hand drain? Superficial to what?

Answer 2

Large veins drain from the palm from the dorsal veinous network (superficial to extensor tendons).
Radial to cephalic
Ulnar to basilic

Question 3

Where are wrist extensors inserted?

Answer 3

The two radial and one ulnar wrist extensors are inserted into the proximal part of the hand at the metacarpal bases

Question 4

What lies superficial to the wrist extensors?

Answer 4

The extensor tendons of the fingers

Question 5

Describe how the extensor tendons of the fingers lie

Answer 5

Extensor digitorum and dextenor indicis lie together (two tendons from two mucles). Extensor digiti minimi is usually split into two (2 tendons and one muscle)

Question 6

What is the posterior carpal arch?

Answer 6

An arterial anastomosis between radial, ulnar and anterior interosseous arteries, sending branches distal to the spaces deep to the tendons.

Question 7

What type of joint is the wrist? Describe its capsule

Answer 7

A synovial joint, capsulated, with collateral ligaments. Capsule much thicker in front than behind.

Question 8

What bones contribute to the wrist joint?

Answer 8

Radius, radioulnar disc, scaphoid, lunate and triquetral bones

Question 9

What holds the radius and ulna together?

Answer 9

Triangular fibrocartilage nodes the radius and ulna together, and separates the wrist from the radioulnar joint

Question 10

What are the movements of the wrist?

Answer 10

Flexion and extension, abduction and adduction. The axis is not around the forearm.