Hand

Question 1

Thenar muscles

Answer 1

Opponens pollicis, abductor pollicis brevis, flexor pollicis brevis, adductor pollicis

Question 2

Hypothenar muscles

Answer 2

Abductor digiti minimi, flexor digiti minimi brevis, opponens digiti minimi

Question 3

Short muscles

Answer 3

Lumbricals- 1,2,3,4 
Dorsal interossei (4) 
Palmar interossei (3)

Question 4

Opponens pollicis

Answer 4

Origin: flexor retinaculum and tubercles of scaphoid and trapezium
Insertion: lateral side of 1st metacarpal
Action: to oppose thumb, it draws 1st metacarpal medially to center of palm and rotates it medially
Innervation: recurrent branch of median nerve (C8, T1)
Blood supply:

Question 5

Abductor pollicis brevis

Answer 5

Origin: flexor retinaculum and tubercles of scaphoid and trapezium
Insertion: lateral side of base of proximal phalanx of thumb
Action: abducts thumb; helps oppose it
Innervation: recurrent branch of median nerve (C8, T1)
Blood supply:

Question 6

Flexor pollicis brevis

Answer 6

Origin: flexor retinaculum and tubercles of scaphoid and trapezium
Insertion: lateral side of base of proximal phalanx of thumb
Action: flexes thumb
Innervation: recurrent branch of median nerve (C8, T1)
Blood supply:

Question 7

Adductor pollicis

Answer 7

Origin: oblique head- bases of 2nd and 3rd metacarpals, capitate, adjacent carpals; transverse head- anterior surface of shaft of 3rd metacarpal
Insertion: medial side of base of proximal phalanx of thumb
Action: adducts thumb toward lateral border of palm
Innervation: deep branch of ulnar nerve (C8, T1)
Blood supply:

Question 8

Abductor digiti minimi

Answer 8

Origin: pisiform
Insertion: medial side of base of proximal phalanx of 5th finger
Action: abducts 5th finger, assists in flexion of its proximal phalanx
Innervation: deep branch of ulnar nerve (C8, T1)
Blood supply:

Question 9

Flexor digiti minimi brevis

Answer 9

Origin: hook of hamate and flexor retinaculum
Insertion: medial border of 5th metacarpal
Action: flexes proximal phalanx of 5th finger
Innervation: deep branch of ulnar nerve (C8, T1)
Blood supply:

Question 10

Opponens digiti minimi

Answer 10

Origin: hook of hamate and flexor retinaculum
Insertion: medial border of 5th metacarpal
Action: draws 5th metacarpal anterior and rotates it, bringing 5th finger into opposition with thumb
Innervation: deep branch of ulnar nerve (C8, T1)
Blood supply:

Question 11

Lumbricals: 1 &2

Answer 11

Origin: lateral 2 tendons of flexor digitorum profundus
Insertion: lateral sides of extensor expansions of 2nd-5th fingers
Action: flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers
Innervation: median nerve (C8, T1)
Blood supply:

Question 12

Lumbricals: 3&4

Answer 12

Origin: medial 3 tendons of flexor digitorum profundus
Insertion: lateral sides of extensor expansions of 2nd-5th fingers
Action: flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers
Innervation: deep branch of ulnar nerve (C8, T1)
Blood supply:

Question 13

Dorsal interossei, 1-4

Answer 13

Origin: adjacent sides of 2 metacarpals
Insertion: bases of proximal phalanges; extensor expansions of 2nd-4th fingers
Action: abduct 2nd-4th fingers from axial line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
Innervation: deep branch of ulnar nerve (C8, T1)

Question 14

Palmar interossei, 1-3

Answer 14

Origin: palmar surfaces of 2nd, 4th and 5th metacarpals
Insertion: bases of proximal phalanges; extensor expansions of 2nd, 4th and 5th fingers
Action: adduct 2nd, 4th and 5th fingers toward axial lie; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints