Hand

Question 1

What is the actions of opponens pollicis?

Answer 1

Opposes the thumb, by medially rotating and flexing the metacarpal on the trapezium.

Question 2

What is the action of abductor pollicis brevis?

Answer 2

Abducts the thumb

Question 3

What is the action of flexor pollicis brevis?

Answer 3

Flexes the metacarpophalangeal (MCP) joint of the thumb.

Question 4

What is the action of opponens digiti minimi?

Answer 4

It rotates the metacarpal of the little finger towards the palm, producing opposition.

Question 5

What is the action of abductor digiti minimi?

Answer 5

Abducts the little finger.

Question 6

What is the action of flexor digiti minimi brevis?

Answer 6

Flexes the MCP joint of the little finger.

Question 7

What is the action of the lumbricals?

Answer 7

The flex at the MCP joint, and extend at the interphalangeal (IP) joints of each finger.

Question 8

What is the action of the dorsal interossei?

Answer 8

Abduct the fingers at the MCP joint.

Question 9

What is the action of the palmar interossei?

Answer 9

Adducts the fingers at the MCP joint.

Question 10

What is the action of palmaris brevis?

Answer 10

Wrinkles the skin of the hypothenar eminence and deepens the curvature of the hand, improving grip.

Question 11

What is the action of adductor pollicis?

Answer 11

Adductor of the thumb