hand

Question 1

opponens pollicis

Answer 1

Origin: Tubercle of trapezium bone and flexor retinaculum of hand.
Insertion: Anterolateral aspect of body of first metacarpal bone.
Action: Opposes thumb towards other fingers. Innervation: Recurrent branch of median nerve (C8-T1).

Question 2

extensor pollicis brevis

Answer 2

O: post distal radius and interosseous membrane
I: dorsal aspect of base proximal phalanx thumb
A: extends thumb
N: post. antebrachial interosseous nerve (c7-C8)

Question 3

extensor pollicis longus

Answer 3

O: post 1/3 ulna and interosseous membrane
I:
dorsal base of distal phalanx of thumb
A: extends thumb
N: post. antebrachial interosseous nerve c7-c6

Question 4

abductor pollicis brevis

Answer 4

O: tubercles of scaphoid and trapezium, flexor retinaculum
I: lateral aspect of base of proximal phalanx of thumb
A: abducts thumb
N: median nerve C8-t1

Question 5

abductor pollicis longus

Answer 5

O: posterior proximal ulna, radius, interosseous membrane
I: lateral aspect of base of first metatarsal bone
A: abducts and extends thumb
N: post. antebrachial interosseous nerve c7-c8

Question 6

extensor indicis

Answer 6

O: post distal ulna, interosseous membrane
I: extensor expansion of 2nd digit
A: extends 2nd digit
N: post antebrachial interosseous nerve c7-c8

Question 7

extensor digiti minimi

Answer 7

O: lateral epicondyle
I: extensor expansion of 5th digit
A: extension 5th digit
N: post. antebrachial interosseous nerve c7-c8

Question 8

flexor pollicis longus

Answer 8

O: ant surface of radius and interosseous membrane
I: palmar aspect of base of distal phalanx of thumb
A: flexes thumb
N: ant. antebrachial interosseous nerve c7-t1

Question 9

flexor pollicis brevis

Answer 9

O; trapezium, palmar capitate and trapezoid bones, flexor retinaculum of hand
I: lateral aspect base of proximal phalanx
A: flexes thumb
N: median nerve C8-t1, ulnar nerve C8t1

Question 10

adductor pollicis

Answer 10

Origin: Palmar aspects of capitate bone, bases of second and third metacarpal bones, and body of third metacarpal bone.
Insertion: Medial base of the proximal phalanx of thumb.
Action: Adducts thumb at its carpometacarpal joint. Innervation: Deep branch of ulnar nerve (C8-T1).

Question 11

abductor digiti minimi

Answer 11

Origin: Pisiform bone and tendon of flexor carpi ulnaris. Insertion: Medial aspect of base of proximal phalanx of little finger.
Action: Abducts little finger at its metacarpophalangeal joint. Innervation: Deep branch of ulnar nerve (C8-T1).

Question 12

flexor digiti minimi brevis

Answer 12

Origin: Hook of hamate bone and flexor retinaculum of hand. Insertion: Medial aspect of base of proximal phalanx of little finger.
Action: Flexes little finger at its metacarpophalangeal joint. Innervation: Deep branch of ulnar nerve (C8-T1).

Question 13

opponens digiti minimi

Answer 13

Origin: Hook of hamate bone and flexor retinaculum of hand. Insertion: Medial aspect of fifth metacarpal bone.
Action: Opposes little finger towards thumb. Innervation: Deep branch of ulnar nerve (C8-T1).

Question 14

lumbricals main function

Answer 14

These muscles mainly act to simultaneously flex the metacarpophalangeal joints and extend the interphalangeal joints of the fingers.

Question 15

dorsal interossei

Answer 15

abduct the index, middle, and ring fingers at their metacarpophalangeal joints; - simultaneously flex the metacarpophalangeal joints and extend the interphalangeal joints of the index, middle, and ring fingers.

Question 16

palmar interossei

Answer 16

adduct the index, ring, and little fingers at their metacarpophalangeal joints; - simultaneously flex the metacarpophalangeal joints and extend the interphalangeal joints of the index, ring, and little fingers.