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Gross # 2 > Intrinsic Muscles of the Hand > Flashcards

Intrinsic Muscles of the Hand Flashcards

0
Q

Opponens pollicis insertion?

A

Lateral side of the 1st metacarpal

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1
Q

Opponens pollicis origin? (Thenar muscle)

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, 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

Abductor pollicis brevis origin? (Thenar muscle)

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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5
Q

Abductor pollicis brevis insertion?

A

Lateral side of base of proximal phalanx of thumb

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6
Q

Abductor pollicis longus innervation?

A

Recurrent branch of median nerve (C8, T1)

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7
Q

Abductor pollicis brevis action?

A

abducts thumb; helps oppose it

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8
Q

Flexor pollicis brevis (Superficial & Deep Head) (Thenar muscle) origin?

A

Flexor retinaculum and tubercles of scaphoid and trapezium

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9
Q

Flexor pollicis brevis (Superficial & Deep Head) insertion?

A

Lateral side of base of proximal phalanx of thumb

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10
Q

Flexor pollicis brevis (Superficial & Deep Head) innervation?

A

Superficial - Recurrent branch of median nerve (C8, T1)

Deep - deep branch of ulnar nerve c8, t1

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11
Q

Flexor pollicis brevis (Superficial & Deep Head)

A

flexes thumb

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12
Q

Adductor pollicis (Thenar muscle) origin?

A

Oblique head : bases of 2nd and 3rd metacarpals, capitate, adjacent carpals
Transverse head : Anterior surface of shaft of 3rd metacarpal

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13
Q

Adductor pollicis insertion?

A

Medial side of base of proximal phalanx of thumb

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14
Q

Adductor pollicis innervation?

A

Deep branch of ulnar nerve (C8, T1)

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15
Q

Adductor pollicis action?

A

adducts thumb toward lateral border of palm

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16
Q

Abductor digiti minimi (hypothenar muscle) origin?

A

Pisiform

17
Q

Abductor digiti minimi insertion?

A

medial side of base of proximal phalanx of 5th finger

18
Q

Abductor digiti minimi innervation?

A

Deep branch of ulnar nerve (C8, T1)

19
Q

Abductor digiti minimi action?

A

abducts 5th finger, assits in flexion of its proximal phalanx

20
Q

Flexor digiti minimi brevis (hypothenar muscle) origin?

A

Hook of hamate and flexor retinaculum

21
Q

Flexor digiti minimi brevis insertion?

A

medial side of base of proximal phalanx of 5th finger

22
Q

Flexor digiti minimi brevis innervation?

A

Deep branch of ulnar nerve (C8, T1)

23
Q

Flexor digiti minimi brevis action?

A

flexes proximal phalanx of 5th finger

24
Q

Opponens digiti minimi (hypothenar muscle) origin?

A

Hook of hamate and flexor retinaculum

25
Q

Opponens digiti minimi insertion?

A

Medial border of 5th metacarpal

26
Q

Opponens digiti minimi Innervation?

A

Deep branch of ulnar nerve (C8, T1)

27
Q

Opponens digiti minimi action?

A

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

28
Q

Lumbricals (Short muscles) origin?

A

1 & 2: Lateral two tendons of flexor digitorum profundus (as unipennate muscles)
3 & 4: medial three tendons of flexor digitorum profundus ( as bipennate muscles)

29
Q

Lumbricals insertion?

A

Lateral sides of extensor expansions of 2nd-5th fingers

30
Q

Lumbricals innervation?

A

Median nerve (C8, T1)

31
Q

Lumbricals action?

A

flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers

32
Q

Dorsal interossei, 1-4 (Short muscle) origin?

A

Adjacent sides of two metacarpals (as bipennate muscles)

33
Q

Dorsal interossei, 1-4 insertion?

A

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

34
Q

Dorsal interossei, 1-4 innervation?

A

Deep branch of ulnar nerve (C8, T1)

35
Q

Dorsal interossei, 1-4 actions?

A

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

36
Q

Palmar interossei, 1-3 (short muscle) origin?

A

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

37
Q

Palmar interossei, 1-3 insertion?

A

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

38
Q

Palmar interossei, 1-3 innervation?

A

Deep branch of ulnar nerve (C8, T1)

39
Q

Palmar interossei, 1-3 actions?

A

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

Gross # 2 (8 decks)

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