Muscles of the hand

Question 1

What are the intrinsic muscles of the hand strucutred like?

Answer 1

They have their proximal attachments, belly and distal attachments within the hand.

They are supplied mostly by the ulnar nerve, some by the median.

Question 2

What are the compartments of the hand?

Answer 2

The Thenar (orange)

Adductor compartment (Purple)

Central compartment (pink)

Hypothenar compartment (blue)

Interrossesous compartment (brown)

Question 3

What is contained within the thenar compartment?

Answer 3

The muscles that move the thumb.

Abductor pollicis brevis (APB)

Flexor Polilicis brevis (FBP)
Opponents pollicis (OP)

Question 4

Abductor Pollicis Brevis - N/S and action.

Answer 4

N/S - Median Nerve

Action - Abducts thumb and helps oppose it.

Question 5

Felxor pollicis brevis - N/S and Action

Answer 5

Superficial head - Median Nerve

Deep Head - Ulnar Nerve

Action - flexes thumb

Question 6

In the thenar compartment, what does the Median Nerve supply?

Answer 6

Muscles within the thenar compartment:

Abductor Pollicis Brevis

Flexor Pollicis Brevis (superficial head)

Oponens Pollicis