Muscles of the hand

Question 1

What are the attachments of the thenar muscles?

Answer 1

Flexor retinaculum (roof of the carpal tunnel) and the thumb

Question 2

What is the innervation of the thenar muscles?

Answer 2

Median nerve

Question 3

What are the attachments of the hypothenar muscles?

Answer 3

Flexor retinaculum and the pinky

Question 4

What is the innervation of the hypothenar muscles?

Answer 4

Ulnar nerve

Question 5

Where is the adductor pollicis located on the hand?

Answer 5

Palmer region, extends to thumb

Question 6

What the action of the adductor pollicis?

Answer 6

Adduction of the thumb

Question 7

What is the innervation of the adductor pollicis?

Answer 7

Ulnar nerve

Question 8

What is the action of the lumbricals?

Answer 8

Flexion of the MCP joints and extension of the PIP & DIP joints (talking hand action)

Question 9

What is the innervation of the lumbricals of 1 and 2?

Answer 9

Median nerve

Question 10

What is the innervation of lumbricals 3 and 4?

Answer 10

Ulnar nerve

Question 11

What is the action of the palmer interossei?

Answer 11

Adduction of the digits
“PAD” - palmer ADducts digits

Question 12

What is the innervation of the palmer interossei?

Answer 12

Ulnar nerve

Question 13

What is the action of the dorsal interossei?

Answer 13

Abduction of the digits
“DAB” - dorsal ABduct digits

Question 14

What is the innervation of the dorsal interossei?

Answer 14

Ulnar nerve

Question 15

What muscle is the roof of the carpal tunnel?

Answer 15

Flexor retinaculum (transverse carpal ligament)

Question 16

What are the attachments of the flexor retinaculum?

Answer 16

“Across carpal bones”
Attaches from scaphoid/trapezium carpal bones, across capral tunnel, and to hammate/pisiform carpal bones

Question 17

What muscles emerge from the flexor retinaculum?

Answer 17

Thenar and hypothenar muscles