Muscles Of The Hand

Question 1

Hand consist of:

Answer 1

1. Carpus (wrist)
2. Metacarpus (hand proper)
3. Digits (fingers)

Question 2

Fingers names lateral to medial

Answer 2

Pollex (thumb), indicis (index), middle, ring, digiti minimis (pinky)

Question 3

Anterior side of hand

Answer 3

Volar region (palm)

Question 4

Posterior side of hand

Answer 4

Dorsum (back of hand)

Question 5

Axis of hand

Answer 5

3rd metacarpal through middle finger

Question 6

Abduction and adduction of fingers are relative to:

Answer 6

Axis of the hand

Question 7

Middle finger has…abductor and …adductor

Answer 7

2 abductors and no adductor no

Question 8

Polex has…to rest of fingers

Answer 8

90 degree rotation

Question 9

Movements of pollex are defined at…to movements of other fingers

Answer 9

Right angles

Question 10

Finger movements are at…joints

Answer 10

Metacarpophalangeal joints (MCP)

Question 11

Polex movements are at…joints

Answer 11

Carpometacapus joints (CMC)

Question 12

Carpal arch is formed by:

Answer 12

Carpal bones and flexor retinaculum

Question 13

What passes through the carpal tunnel?

Answer 13

1. 4 flexor digitorum superficialis tendons
2. 4 flexor digitorum profundus tendons
3. 1 flexor pollicis longus tendon
4. Median nerve

Question 14

Groups of intrinsic muscles of the hand

Answer 14

1. Thenar (inferior to thumb)
2. Hypothenar (inferior to pinky)
3. Central

Question 15

Thenar muscle group includes:

Answer 15

1. Abduction pollicis brevis (APB)
2. Flexor pollicis brevis (FPB)
3. Opponens pollicis (deepest)

Question 16

Abduction pollicis brevis (origin, insertion, action, nerve)

Answer 16

1. Origin: Scaphoid, trapezium, flexor retinaculum
2. Insertion: proximal phalanx of thumb
3. Action: abduction of thumb @ MCP & CMC joints
4. Nerve: Median

Question 17

Flexor pollicis brevis (origin, insertion, action, nerve)

Answer 17

1. Origin: Trapezium, flexor retinaculum
2. Insertion: proximal phalanx of thumb
3. Action: flexion of thumb @ CMC & MCP joints
4. Nerve: Median (& ulnar FYI)

Question 18

Abductor digiti minimi (origin, insertion, action, nerve)

Answer 18

1. Origin: Pisiform and tendons of flexor carpi ulnaris (FCU)
2. Insertion: proximal phalanx of pinky
3. Action: abduction of pinky @ CMC & MCP joints
4. Nerve: Ulnar

Question 19

Flexor digiti minimi brevis of manus (origin, insertion, action, nerve)

Answer 19

1. Origin: Hook of hamate and flexor retinaculum
2. Insertion: proximal phalanx of pinky
3. Action: flexion of pinky @ CMC & MCP joints
4. Nerve: Ulnar

Question 20

True or false: there is a flexor digiti minimi brevis and longus.

Answer 20

False, only brevis

Question 21

Adductor pollicis (origin, insertion, action, nerve)

Answer 21

1. Origin: capitate, 2nd & 3rd metacarpals
2. Insertion: base of proximal phalanx of thumb
3. Action: adduction of thumb @ CMC & MCP joints
4. Nerve: Ulnar

Question 22

Lumbrical group (origin, insertion, action, nerve)

Answer 22

Origin: tendon of flexor digitorum profundus of fingers 2-5
Insertion: dorsal digital expansion of fingers 2-5
Action: Flexion of fingers 2-5 @ MCP joints, extension of fingers 2-5 @ PIP & DIP joints
Nerve: Median for finger 2&3 and ulnar for fingers 4&5

Question 23

Lumbrical insertions #1-4

Answer 23

1. L#1-F#2
2. L#2-F#3
3. L#3-F#4
4. L#4-F#5

Question 24

Hypothenar muscle group includes:

Answer 24

1. Abduction digiti minimis brevis (ADMB)
2. Flexor digiti minimis brevis (FDMB)
3. Oppens digit minimi (deepest)
4. Palmaris brevis

Question 25

Central muscle group include:

Answer 25

1. Lumbrical muscles 2. Dorsal Interossei muscles 3. Palmar Interossei muscles 4. Adductor pollicis

Question 26

Palmar interossei muscles (origin, insertion, action, nerve)

Answer 26

1. Origin: Anterior side of metacarpals of fingers #2,4 & 5 2. Insertion: Base of proximal phalanges & dorsal digital expansions of fingers #2,4 & 5 3. Action: Adduction and flexion of fingers #2,4 & 5 @ MCP joints & extension of fingers #2, 4 & 5 @ IP joints 4. Nerve: Ulnar

Question 27

PAD

Answer 27

P almar interossei muscle = AD duction (& tata)

Question 28

Dorsal interossei muscles (origin, insertion, action, nerve)

Answer 28

1. Origin: Adjacent sides of metacarpals #2,3 & 4 2. Insertion: Base of proximal phalanx & dorsal digital expansions of fingers #2,3 & 4 3. Action: Abduction and flexion of fingers #2,3 & 4 @ MCP joints extension of fingers #2,3 & 4 @ IP joints 4. Nerve: Ulnar

Question 29

DAB

Answer 29

D orsal interossei muscles = AB duction