Summary of upper limb innervation (dave's notes)

Question 1

What is the cutaneous innervation to the shoulder?

Answer 1

The supraclavicular nerves (C4) from the cervical plexus

Question 2

What is the cutaneous innervation to the floor of the axilla? What additional area is also supplied by this nerve?

Answer 2

The lateral branch of the 2nd intercostal nerve. Also supplies a variable amount of the inner part of the arm.

Question 3

What is the cutaneous innervation to the arm?

Answer 3

The lateral surface of the arm is supplied by the upper (axillary) and lower (radial) lateral cutaneous nerves.
The posterior area over the triceps skin is supplied by the posterior cutaneous nerve of the arm (radial).

Question 4

What is the cutaneous innervation of the forearm?

Answer 4

Posteriorly: Posterior cutaneous nerve of the forearm (radial)
Medial: Medial cutaneous nerve of the forearm (Med cord BP)
Lateral: Lateral cutaneous nerve of the forearm (Mscn)

Question 5

What is the cutaneous innervation of the palm?

Answer 5

Ulnar side: superficial branch of the ulnar nerve
Middle: Palmar branch of median nerve
Palmar surface of digits and thumb by palmar branches of ulnar and median nerves

Question 6

What is the cutaneous innervation of the dorsal surface of the hand?

Answer 6

Ulnar side: 1 1/2 -> dorsal branch of the lunar nerve

Radial side: 3 1/2 -> terminal cutaneous branches of the radial nerve

Question 7

What is the muscular innervation of the upper arm?

Answer 7

Flexor compartment: musculocutaneous nerve

Extensor compartment: Radial nerve

Question 8

What is the muscular innervation of the forearm?

Answer 8

Flexor compartment: median nerve (except for FCU and half of FDP)
Extensor compartment: Radial nerve (PIN)
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Question 9

What is the muscular innervation of the hand?

Answer 9

Intrinsic muscles of the hand - chiefly ulnar, but median to the thenar eminence and the radial two lumbricals
Pronate WHAT??

Question 10

How does sympathetic innervation reach the upper limb?

Answer 10

The grey ramus communicants joins each root. these remain in the nerves till very near their destination of supply They remain with the same segment from where they join.

Question 11

What do the sympathetic nerves in the upper limb supply?

Answer 11

In the skin they supply arterioles, sweat glands, and erector pili. Deep they supply local areas of artery is.

Question 12

see text re brachial plexus

Answer 12

see text re brachial plexus