Blood supply and nerves of hand

Question 1

Main arteries forming collateral circulation in hand

Answer 1

radial a. and ulnar a.

Question 2

Main nerves forming cutaneous branches of hand

Answer 2

ulnar n. and median n.

radial n. for lateral cutaneous dorsal half

Question 3

Deep palmar arch (artery)

Answer 3

radial a. and ulnar a.

mainly radial a.

Question 4

Superficial palmar arch (artery)

Answer 4

radial a. and ulnar a.

mainly ulnar a.

Question 5

Median nerve innervation in hand

Answer 5

forms palmar cutaneous branch

• recurrent branch innervates thenar compartment
• lateral branch to 1st lumbrical
• medial branch to 2nd lumbrical

Question 6

Ulnar nerve innervation in hand

Answer 6

forms palmar cutaneous branch

• -dorsal branch sensory to medial/dorsal aspect of hand
• superficial branch to palmaris brevis
• deep branch to hypothenar compartment, adductor compartment, interossei, and lumbricals 3, 4

Question 7

Radial nerve innervation in hand

Answer 7

• superficial branch to brachioradialis/extensor carpi radialis longus, skin to lateral half of dorsal aspect of hand
• deep branch to supinator and other superficial extrinsic extensors
• becomes post. interosseous n. at supinator, innervates deep extrinsic extensors
• test at MCP joints