Unit 2 - Upper Limb: Hypothenar Muscles (Ex. II)

Question 1

flexor digiti minimi brevis

Answer 1

O: hook of hamate; flexor retinaculum
I: base of 5th proximal phalanx
Inn: ulnar N (C8, T1)
A: flexion @ MCP joint of digit 5

Question 2

abductor digiti minimi

Answer 2

O: pisiform
I: ulnar base of 5th proximal phalanx; dorsal digital expansion of digit 5
Inn: ulnar N (C8, T1)
A: flexion and abduction @ MCP joint of digit 5; extension @ PIP and DIP joints of digit 5

Question 3

palmaris brevis

Answer 3

O: ulnar border of palmar aponeurosis
I: skin of hypothenar eminence
Inn: ulnar N (C8, T1)
A: tightens palmar aponeurosis ==> protective function

Question 4

opponens digiti minimi

Answer 4

O: hook of hamate; flexor retinaculum
I: ulnar border of 5th metacarpal
Inn: ulnar N (C8, T1)
A: opposition of metacarpal - draws it in palmar direction