MUSCLES OF THE HAND

Question 1

what are the 5 compartments of the intrinsic hand muscles?

Answer 1

1. thenar compartment
2. hypothenar compartment
3. adductor compartment
4. central compartment
5. interosseous compartment

Question 2

what are the muscles of the thenar compartment?

Answer 2

1. abductor pollicis brevis
2. flexor pollicis brevis
3. opponens pollicis

Question 3

what are the muscles of the hypothenar compartment?

Answer 3

1. abductor digiti minimi
2. flexor digiti minimi brevis
3. opponens digiti minimi

Question 4

what is the muscle of the adductor compartment?

Answer 4

1. adductor pollicis

Question 5

what is contained in the central compartment of the hand?

Answer 5

1. lumbricals

2. long flexor tendons

Question 6

what is contained in the interosseous compartements?

Answer 6

interosseous muscles

Question 7

what causes abduction of the thumb?

Answer 7

1. abductor pollicis longus

2. abductor pollicis brevis

Question 8

what causes adduction of the thumb?

Answer 8

1. adductor pollicis

Question 9

what causes extension of the thumb?

Answer 9

1. extensor pollicis longus
2. extensor pollicis brevis
3. abductor pollicis longus

Question 10

what causes flexion of the thumb?

Answer 10

1. flexor pollicis longus

2. flexor pollicis brevis

Question 11

what causes opposition of the thumb?

Answer 11

1. opponens pollicis

Question 12

what are the proximal and distal attachments of opponens pollicis?

Answer 12

proximal: flexor retinaculum
distal: 1st metacarpal

Question 13

what is the innervation of opponens pollicis?

Answer 13

median nerve

Question 14

what is the action of opponens pollicis?

Answer 14

oppose thumb

Question 15

what are the proximal and distal attachments of abductor pollicis brevis?

Answer 15

proximal: flexor retinaculum
distal: base of proximal phalanx of thumb

Question 16

what is the innervation of abductor pollicis brevis?

Answer 16

median nerve

Question 17

what is the action of abductor pollicis brevis?

Answer 17

abduct thumb

Question 18

what are the proximal and distal attachments of flexor pollicis brevis?

Answer 18

proximal: flexor retinaculum
distal: base of proximal phalanx of thumb

Question 19

what is the innervation of flexor pollicis brevis?

Answer 19

median nerve

Question 20

what is the action of flexor pollicis brevis?

Answer 20

flex thumb

Question 21

what are the proximal and distal attachments of adductor pollicis?

Answer 21

proximal:
oblique head: bases of 2nd and 3rd metacarpals
transverse head: shaft of 3rd metacarpal

distal: base of proximal phalanx of thumb

Question 22

what is the innervation of adductor pollicis

Answer 22

ulnar nerve

Question 23

what is the action of adductor pollicis?

Answer 23

adduct thumb

Question 24

what are the proximal and distal attachments of the lumbricals?

Answer 24

proximal:
1 and 2: lateral 2 tendons of EDP (unipennate)
3 and 4: medial 3 tendons of EDP (bipennate)

distal: extensor expansions of 2-5th digits

Question 25

what is the innervation of the lumbricals?

Answer 25

median nerve

Question 26

what is the action of the lumbricals?

Answer 26

flex MCP joints

Question 27

what are the proximal and distal attachments of dorsal interossei 1-4?

Answer 27

proximal: between two metacarpals (bipennate)
distal: bases of proximal phalanges, extensor expansions

Question 28

what is the innervation of the dorsal interossei?

Answer 28

ulnar nerve

Question 29

what is the action of the dorsal interossei?

Answer 29

abduct 2nd-4th fingers (DAB)

Question 30

what are the proximal and distal attachments of palmar interossei 1-3?

Answer 30

proximal: palmar surface of 2nd, 4th, 5th metacarpals (unipennate)
distal: bases of proximal phalanges, extensor expansions of 2nd, 4th, 5th

Question 31

what is the innervation of palmar interossei?

Answer 31

ulnar nerve

Question 32

what is the action of the palmar interossei?

Answer 32

adduct 2nd, 4th, 5th, fingers to axial line (PAD)