Upper Limb - Muscles of the Hand (1)

Question 1

Name the three muscles in the thenar compartment of the hand. What is their combined primary function?

Answer 1

Abductor pollicis brevis, Flexor pollicis brevis, Opponens pollicis. Together, they produce opposition of the thumb.

Question 2

What is the common origin of all muscles in the thenar compartment of the hand?

Answer 2

Flexor retinaculum.

Question 3

What is the innervation to the muscles of the thenar compartment?

Answer 3

Recurrent branch of median nerve.

Question 4

What is the name of the deep, fan-shaped muscle in the hand? What is its origin and insertion?

Answer 4

Adductor pollicis. Origin at the 2nd and 3rd metacarpals and capitate. Inserts at the 1st proximal phalanx.

Question 5

Name the three muscles of the hypothenar compartment of the hand.

Answer 5

Abductor digiti minimi. Flexor digiti minimi brevis. Opponens digiti minimi.

Question 6

Which lumbricals are bipennate, and which are unipennate?

Answer 6

1st and 2nd are unipennate. 3rd and 4th are bipennate.

Question 7

What is the function of the lumbricals?

Answer 7

Flexion of the MCP joints, extension of the 2nd-5th interphalangeal joints. (Lleyton Hewitt Lumbricals)

Question 8

How many dorsal interossei muscles are there? What is their function? How many palmar interossei? And their function?

Answer 8

3 palmar unipennate (adduct fingers), 4 dorsal bipennate (abduct fingers)
Remember PAD DAB.