O & I: Intrinsic Hand Muscles Flashcards

1
Q

What are the 4 Thenar Muscles?

A

1) Opponens Pollicis
2) Abductor Pollicis Brevis
3) Flexor Pollicis Brevis
4) Adductor Pollicis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the 3 Hypothenar muscles?

A

1) Abductor digiti minimi
2) Flexor Digiti minimi brevis
3) Opponens digiti

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the 3 short muscles?

A

1) Lumbricals
2) Dorsal interossei
3) Palmar interossei

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Origin: Opponens Pollicis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Insertion: Opponens Pollicis

A

Lateral side of 1st metacarpal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Innervation: Opponens Pollicis

A

recurrent branch of median nerve (C8, T1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Action: Opponens Pollicis

A

to oppose thumb, it draws 1st metacarpal medially to center of palm and rotates it medially

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Origin: Abductor Pollicis Brevis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Insertion: Abductor Pollicis Brevis

A

Lateral side of base of proximal phalanx of thumb

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Innervation: Abductor Pollicis Brevis

A

recurrent branch of median nerve (C8, T1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Action: Abductor Pollicis Brevis

A

abducts thumb; helps oppose it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Origin: Flexor Pollicis Brevis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Insertion: Flexor Pollicis Brevis

A

Lateral side of base of proximal phalanx of thumb

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Innervation: Flexor Pollicis Brevis

A

Superficial head: recurrent branch of median n. (C8-T1)

Deep head: deep branch of ulnar nerve (C8, T1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Action: Flexor Pollicis Brevis

A

Flexes Thumb

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Origin: Adductor Pollicis

A

Oblique Head: Bases of 2nd and 3rd metacarpals, capitate, and adjacent carpals

Transverse Head: anterior surface of shaft of 3rd metacarpal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Insertion: Adductor Pollicis

A

medial side of base of proximal phalanx of thumb

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Innervation: Adductor Pollicis

A

deep branch of ulnar nerve (C8, T1)

19
Q

Action: Adductor Pollicis

A

adducts thumb toward lateral border of palm

20
Q

Origin: Abductor Digiti Minimi

21
Q

Insertion: Abductor Digiti Minimi

A

medial side of base of proximal phalanx of 5th digit

22
Q

Innervation: Abductor Digiti Minimi

A

deep branch of ulnar nerve (C8, T1)

23
Q

Action: Abductor Digiti Minimi

A

abducts 5th digit; assists in flexion of its proximal phalanx

24
Q

Origin: Flexor Digiti Minimi Brevis

A

hook of hamate and flexor retinaculum

25
Insertion: Flexor Digiti Minimi Brevis
medial side of base of proximal phalanx of 5th digit
26
Innervation: Flexor Digiti Minimi Brevis
deep branch of ulnar nerve (C8, T1)
27
Action: Flexor Digiti Minimi Brevis
flexes proximal phalanx of 5th digit
28
Origin: Opponens Digiti Minimi
hook of hamate and flexor retinaculum
29
Insertion: Opponens Digiti Minimi
medial border of 5th metacarpal
30
Innervation: Opponens Digiti Minimi
deep branch of ulnar nerve (C8, T1)
31
Action: Opponens Digiti Minimi
draws 5th metacarpal anterior and rotates it bringing 5th digit into opposition with thumb
32
Origin: Lumbricals
1st and 2nd: lateral two tendons of flexor digitroum profundus (as unipennate muscles) 3rd and 4th: medial three tendons of flexor digitorum profundus (as bipennate muscles)
33
Insertion: Lumbricals
lateral sides of extensor expansions of 2nd-5th digits
34
Innervation: Lumbricals
1st and 2nd: median nerve (C8, T1) 3rd and 4th: deep branch of ulnar nerve (C8, T1)
35
Action: Lumbricals
flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th digits
36
Origin: Dorsal Interossei, 1st - 4th
adjacent sides of two metacarpals (as bipennate muscles)
37
Insertion: Dorsal Interossei, 1st - 4th
bases of proximal phalanges; extensor expansions of 2nd-4th digits
38
Innervation: Dorsal Interossei, 1st - 4th
deep branch of ulnar nerve (C8, T1)
39
Action: Dorsal Interossei, 1st - 4th
abducts 2nd-4th digits from axial line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
40
Origin: Palmar Interossei, 1st - 3rd
palmar surfaces of 2nd, 4th, and 5th metacarpals (as unipennate muscles)
41
Insertion: Palmar Interossei, 1st - 3rd
bases of proximal phalanges; extensor expansions of 2nd, 4th, and 5th digits
42
Innervation: Palmar Interossei, 1st - 3rd
deep branch of ulnar nerve (C8, T1)
43
Action: Palmar Interossei, 1st - 3rd
adduct 2nd, 4th, and 5th digits toward axial line; assist lumbricals in flexing metacarpophalangeal joint and extending interphalangeal joints; extensor expansions of 2nd-4th digits