Intrinsic Muscles Of The Hand Flashcards

0
Q

Insertion of opponens pollicis

A

Lateral side of 1st metacarpal

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1
Q

Origin of opponens pollicis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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2
Q

Innervation of opponens pollicis

A

Recurrent branch of median nerve (c8 and t1)

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3
Q

Actions of opponens pollicis

A

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

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4
Q

Origin of abductor pollicis brevis

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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5
Q

Insertion of abductor pollicis brevis

A

Lateral side of base of proximal phalanx of thumb

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6
Q

Innervation of abductor pollicis brevis

A

Recurrent branch of median nerve (c8 and t1)

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7
Q

Actions of abductor pollicis brevis

A

Abducts thumb, helps oppose it

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8
Q

Origin of flexor pollicis brevis (superficial and deep heads)

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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9
Q

Insertion of flexor pollicis brevis (superficial and deep heads)

A

Lateral side of base of proximal phalanx of thumb

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10
Q

Innervation of flexor pollicis brevis

A

Superficial head: Recurrent branch of median nerve (c8 and t1)
Deep head: deep branch of ulnar nerve (c8 and t1)

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11
Q

Action of flexor pollicis brevis (superficial and deep heads)

A

Flexes thumb

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12
Q

Origin of adductor pollicis (oblique head)

A

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

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13
Q

Origin of adductor pollicis (transverse head)

A

Anterior surface of shaft of 3rd metacarpal

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14
Q

Insertion of adductor pollicis (oblique and transverse heads)

A

Medial side of base of proximal phalanx of thumb

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15
Q

Innervation of adductor pollicis (oblique and transverse heads)

A

Deep branch of ulnar nerve (c8 and t1)

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16
Q

Action of adductor pollicis (oblique and transverse heads)

A

Adducts thumb toward lateral border of palm

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17
Q

Origin of abductor digiti minimi

A

Pisiform

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18
Q

Insertion of abductor digiti minimi

A

Medial side of base of proximal phalanx of 5th finger

19
Q

Innervation of abductor digiti minimi

A

Deep branch of ulnar nerve (c8 and t1)

20
Q

Actions of abductor digiti minimi

A

Abducts 5th finger

Assists in flexion of its proximal phalanx

21
Q

Origin of flexor digiti minimi brevis

A

Hook of hamate and flexor retinaculum

22
Q

Insertion of flexor digiti minimi brevis

A

Medial side of base of proximal phalanx of 5th finger

23
Q

Innervation of flexor digiti minimi brevis

A

Deep branch of ulnar nerve (c8 and t1)

24
Action of flexor digiti minimi brevis
Flexes proximal phalanx of 5th finger
25
Origin of opponens digiti minimi
Hook of hamate and flexor retinaculum
26
Insertion of opponens digiti minimi
Medial border of 5th metacarpal
27
Innervation of opponens digiti minimi
Deep branch of ulnar nerve (c8 and t1)
28
Actions of opponens digiti minimi
Draws 5th metacarpal anterior and rotates it, bringing 5th finger into opposition with thumb
29
Origin of lumbricals 1 and 2
Lateral two tendons of flexor digitorum profundus (as unipennate muscles)
30
Insertion of lumbricals 1 and 2
Lateral side of extensor expansions of 2nd-5th fingers
31
Innervation of lumbricals 1 and 2
Median nerve (c8 and t1)
32
Actions of lumbricals (1,2,3, and 4)
Flex metacarpophalangeal joints | Extend interphalangeal joints of 2nd-5th fingers
33
Origin of lumbricals (3 and 4)
Medial three tendons of flexor digitorum profundus (as bipennate muscles)
34
Insertion of lumbricals (3 and 4)
Lateral sides of extensor expansions of 2nd-5th fingers
35
Innervation of lumbricals (3 and 4)
Deep branch of ulnar nerve (c8 and t1)
36
Origin of dorsal interossei, 1-4
Adjacent sides of two metacarpals (as bipennate muscles)
37
Insertion of dorsal interossei, 1-4
Bases of proximal phalanges | Extensor expansions of 2nd-4th fingers
38
Innervation of dorsal interossei, 1-4
Deep branch of ulnar nerve (c8 and t1)
39
Actions of dorsal interossei, 1-4
Abduct 2nd-4th fingers from axial line | Act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
40
Origin of palmar interossei, 1-3
Palmar surfaces of 2nd, 4th, and 5th metacarpals (as unipennate muscles)
41
Insertion of palmar interossei, 1-3
Bases of proximal phalanges | Extensor expansions of 2nd, 4th, and 5th fingers
42
Innervation of palmar interossei, 1-3
Deep branch of ulnar nerve (c8 and t1)
43
Actions of palmar interossei, 1-3
Adduct 2nd, 4th, and 5th fingers toward axial line | Assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
44
Which intrinsic hand muscles are thenar muscles
Opponens pollicis, abductor pollicis brevis, flexor pollicis brevis, and adductor pollicis
45
Which intrinsic hand muscles are hypothenar muscles?
Abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi
46
Which intrinsic hand muscles are short muscles?
Lumbricals, dorsal interossei, and palmar interossei