Muscles of the hand

Question 1

Opponens pollicis

Answer 1

Origin: Flexor retinaculum
Insertion: Lateral side 1st MCP
Innervation: Median nerve
Action: Opposes thumb

Question 2

Abductor pollicis brevis

Answer 2

Origin: Flexor retinaculum
Insertion: Lateral side proximal phalanx of thumb
Innervation: median nerve
Action: Abduct thumb

Question 3

Flexor pollicis brevis

Answer 3

Origin: Flexor retinaculum
Insertion: proximal phalanx of thumb
Innervation: Median nerve
Action: Flex thumb

Question 4

Adductor pollicis

Answer 4

Origin: Base of 2nd and 3rd metacarpals, capitate and the anterior surface of 3rd metacarpal
Insertion: Medial side base of proximal thumb
Innervation: Ulna nerve
Action: Draws thumb laterally to oppose

Question 5

Palmaris brevis

Answer 5

Origin: Transverse carpal ligament + palmar apnurosis
Insertion: Ulnar palm
Innervation: Ulnar nerve
Action: Wrinkles skin medial palm

Question 6

Abductor digiti minimi

Answer 6

Origin: Pisiform
Insertion: Medial side prox LF
Innervation: Ulnar nerve
Action: Abduct LF

Question 7

Flexor digiti minimi

Answer 7

Origin: Hook of hamate
Insertion: Medial side prox LF
Innervation: Ulnar nerve
Action: Flex LF

Question 8

Opponens digit minimi

Answer 8

Origin: Hook of hamte
Insertion: Medial 5th metacarpal
Innervation: Ulnar nerve
Action: Oppose LF to thumb

Question 9

Dorsal interossei

Answer 9

Origin: Dorsal adjacent sides of metacarpals
Insertion: dorsal- extensor expansions
Innervation: Ulnar nerve
Action: Abduct fingers

Question 10

Palmar interossei

Answer 10

Innervation: Ulnar nerve
Action: Adduct fingers

Question 11

Lumbrical muscles

Answer 11

Origin: FDP tendon
Insertion:Radial lateral band of extensor expansion
Innervation: Median + Ulnar nerve
Action: PIP + DIP joints