W10 - Thenar Eminence Hand Muscles

Question 1

Name the form muscles that make up the thenar eminence

Answer 1

Abductor pollicis brevis
Flexor pollicis brevis
Opponens pollicis
Adductor pollicis

Question 2

Name the proximal and distal attachment sites for the abductor pollicis brevis muscle

Answer 2

Proximal
Scaphoid and trapezium tubercle and adjacent flexor retaculum

Distal
Proximal phalanx and extensor hood of the thumb

Question 3

What nerve supplies the abductor pollicis brevis muscle and what action does it do?

Answer 3

Median nerve C8 to T1

Abduction of the thumb at the MCP and CMC joint

Question 4

Name the proximal and distal attachment sites for the flexor policis brevis

Answer 4

Proximal
Trapezium tubercle and adjacent flexor retaculum

Distal
Proximal phalanx of the thumb

Question 5

What nerve supplies the flexor policies Brevis muscle and what action does it do?

Answer 5

Median nerve C8 - T1

Flexes the thumb at the MCP and CMC joint

Question 6

Name the proximal and distal attachment sites for the opponens pollicis muscle

Answer 6

Proximal
Trapezium tubercle and adjacent flexor retaculum

Distal
Lateral margin and adjacent Palmer surface of the thumb (metacarpal one)

Question 7

Name the nerve that supplies the OPPONENS POLLICIS muscle and what action it does

Answer 7

Median nerve C8 - T1

Medial rotation of the thumb

Question 8

Name the proximal and distal attachment sites for the adductor pollicis muscle

Answer 8

Proximal
Transverse head : metacarpal three
Oblique head : capitate bone and base of metacarpal two and three

Distal
Base of proximal phalanx and extensor hood of the thumb

Question 9

Name the nerve that supplies the adductor pollicis muscle and what action it does

Answer 9

Ulnar nerve C8 -T1

Adductor of the thumb