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Upper Limb > Intrinsic Muscles of the Hand > Flashcards

Intrinsic Muscles of the Hand Flashcards

0
Q

What movement do the thenar muscles perform?

A

Opposition of the thumb

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1
Q

What muscles make up the thenar compartment?

A

Abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis

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2
Q

What is the origin of the opponens pollicis?

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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3
Q

Where does the opponens pollicis insert?

A

Lateral side of first metacarpal

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4
Q

What is the innervation for the opponens pollicis?

A

Recurrent branch of median nerve (C8, T1)

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5
Q

What action does the opponens pollicis perform?

A

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

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6
Q

What is the origin of the abudctor pollicis brevis?

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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7
Q

Where does the abductor pollicis brevis insert?

A

Lateral side of base of proximal phalanx of thumb

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8
Q

What is the innervation of the abductor pollicis brevis?

A

Recurrent branch of median nerve (C8, T1)

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9
Q

What action does the abductor pollicis brevis?

A

Abducts thumb; helps oppose it

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10
Q

What is the origin of the flexor pollicis brevis?

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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11
Q

Where does the flexor pollicis brevis insert?

A

Lateral side of base of proximal phalanx of thumb

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12
Q

What is the innervation of the flexor pollicis brevis?

A

Recurrent branch of median nerve (C8, T1) for superficial head and deep branch of ulnar nerve (C8, T1) for deep head

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13
Q

What action does the flexor pollicis brevis perform?

A

Flexes thumb

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14
Q

What muscle makes up the adductor compartment?

A

Adductor pollicis

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15
Q

What is the origin of the adductor pollicis?

A

Oblique head originates on bases of 2nd and 3rd metacarpals, capitate, adjacent carpals
Transverse head originates on the anterior surface of shaft of 3rd metacarpal

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16
Q

Where does the adductor pollicis insert?

A

Medial side of base of proximal phalanx of thumb

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17
Q

What is the innervation of the adductor pollicis?

A

Deep branch of ulnar nerve (C8, T1)

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18
Q

What action does the adductor pollicis perform?

A

Adducts thumb toward lateral border of palm

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19
Q

What muscles make up the hypothenar compartment?

A

Abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi

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20
Q

What is the origin of the abductor digiti minimi?

A

Pisiform

21
Q

Where does the abductor digiti minimi insert?

A

Medial side of base of proximal phalanx of 5th finger

22
Q

What is the innervation of the abductor digiti minimi?

A

Deep branch of ulnar nerve (C8, T1)

23
Q

What action does the abductor digiti minimi perform?

A

Abducts 5th finger; assists in flexion of its proximal phalanx

24
Q

What is the origin of the flexor digiti minimi brevis?

A

Hook of hamate and flexor retinaculum

25
Q

Where does the flexor digiti minimi brevis insert?

A

Medial side base of proximal phalanx of 5th finger

26
Q

What is the innervation of flexor digiti minimi brevis?

A

Deep branch of ulnar nerve (C8, T1)

27
Q

What action does the flexor digiti minimi brevis perform?

A

Flexes proximal phalanx of 5th finger

28
Q

What is the origin of the opponens digiti minimi?

A

Hook of hamate and flexor retinaculum

29
Q

Where does the opponens digiti minimi insert?

A

Medial border of 5th metacarpal

30
Q

What is the innervation of the opponens digiti minimi?

A

Deep branch of ulnar nerve (C8, T1)

31
Q

What action does the opponens digiti minimi perform?

A

Draws 5th metacarpal anterior and rotates it, bringing 5th finger into opposition with thumb

32
Q

What muscles make up the central compartment and are considered short muscles?

A

The lumbricals

33
Q

What is the origin of lumbricals 1 and 2?

A

Lateral two tendons of flexor digitorum profundus (as unipennate muscles)

34
Q

Where do lumbricals 1 and 2 insert?

A

Lateral sides of extensor expansions of 2nd and 3rd fingers

35
Q

What is the innervation of lumbricals 1 and 2?

A

Median nerve (C8, T1)

36
Q

What action do lumbricals 1 and 2 perform?

A

Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd and 3rd fingers

37
Q

What is the origin of lumbricals 3 and 4?

A

Medial three tendons of flexor digitorum profundus (as bipennate muscles)

38
Q

Where do lumbricals 3 and 4 insert?

A

Lateral sides of extensor expansions of 4th and 5th

39
Q

What is the innervation of lumbricals 3 and 4?

A

Deep branch of ulnar nerve (C8, T1)

40
Q

What action do lumbricals 3 and 4 perform?

A

Flex metacarpophalangeal joints; extend interphalangeal joints of 4th and 5th fingers

41
Q

What muscles make up the interosseous compartments and short muscles of the hand?

A

Dorsal interossei 1-4 and palmar interossei 1-3

42
Q

Where are the dorsal interossei located?

A

Between the metacarpals

43
Q

Where are the palmar interossei located?

A

Palmar surface of 2nd, 4th, and 5th metacarpals

44
Q

What is the origin of the dorsal interossei?

A

Adjacent sides of two metacarpals (as bipennate muscles)

45
Q

Where does the dorsal interossei insert?

A

Bases of proximal phalanges; extensor expansions of 2nd-4th finger

46
Q

What is the innervation of the dorsal interossei?

A

Deep branch of ulnar nerve (C8, T1)

47
Q

What action do the dorsal interossei perform?

A

Abduct 2nd-4th fingers from axial line; act with lumbricals in flexing metacarpophalngeal joints and extending interphalangeal joints

48
Q

What is the origin of the palmar interossei?

A

Palmar surfaces of 2nd, 4th, and 5th metacarpals (as unipennate muscles)

49
Q

Where do the palmar interossei insert?

A

Bases of proximal phalanges; extensor expansions of 2nd, 4th, 5th fingers

50
Q

What is the innervation of the palmar interossei?

A

Deep branch of ulnar nerve (C8, T1)

51
Q

What action do the palmar interossei perform?

A

Adduct 2nd, 4th, and 5th fingers toward axial line; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Upper Limb (18 decks)

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