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Anatomy > Hand Muscles, Movement And Function > Flashcards

Hand Muscles, Movement And Function Flashcards

1
Q

Name the muscles of the thenar eminence

A

Flexor pollicis brevis
Abductor pollicis brevis
Opponents Pollicis
Adductor pollicis

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2
Q

Which is the most medial of the thenar muscles?

A

Flexor Pollicis Brevis

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3
Q

What are the origins of Flexor Pollicis Brevis?

A

Flexor retinaculum
Tubercle of trapezium

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4
Q

Where does Flexor Pollicis Brevis insert?

A

Radial side of the base of the proximal phalanx of thumb

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5
Q

What is the nerve supply of Flexor Pollicis Brevis?

A

Median T1

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6
Q

What are the actions of Flexor Pollicis Brevis?

A

Flexion MCP, CMC, medial rotation of thumb

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7
Q

Which is the most lateral and superficial of the thenar muscles?

A

Abductor Pollicis Brevis

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8
Q

What are the origins of Abductor Pollicis Brevis?

A

Flexor retinaculum
Tubercles of scaphoid and trapezium

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9
Q

Where are the insertions of Abductor Pollicis Brevis?

A

Radial side of the base of the proximal phalanx of the thumb
Extensor hood of the thumb

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10
Q

What is the nerve supply of Abductor Pollicis brevis?

A

Median T1

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11
Q

What action does Abductor Pollicis brevis produce?

A

Abduction of the CMC/MCP joints of the thumb

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12
Q

Where does Opponens Pollicis originate?

A

Flexor retinaculum
Tubercle of trapezium

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13
Q

Where does Opponens Pollicis insert?

A

Whole length anterior-lateral surface of first metacarpal

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14
Q

What is the nerve supply of Opponens Pollicis?

A

Median T1

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15
Q

What action does Opponens Pollicis produce?

A

Opposition

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16
Q

Which thenar muscle is found in the web space of the thumb?

A

Adductor Pollicis

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17
Q

Where does adductor Pollicis originate?

A

Capitate
Base of metacarpal 2 and 3
Anterior surface shaft of the third metacarpal

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18
Q

Where does adductor Pollicis insert?

A

Medial side base proximal phalanx of the thumb
Extensor hood of the thumb

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19
Q

What is the nerve supply of adductor Pollicis?

A

Ulnar nerve C8, T1

20
Q

What action does adductor Pollicis produce?

A

Adduction of the thumb

21
Q

Which muscles are in the hypothenar eminence?

A

Abductor Digiti Minimi
Flexor Digiti Minimi
Opponens Digiti Minimi
Palmaris brevis

22
Q

Which is the most superficial hypothenar muscle?

A

Abductor Digit Minimi

23
Q

Where does Adductor Digiti Minimi originate?

A

Pisiform
Pisohammate ligament
FCU tendon

24
Q

Where does Abductor Digiti Minimi insert?

A

Ulnar side proximal phalanx of little finger
Extensor hood

25
Q

What actions are produces by Abductor Digiti Minimi?

A

Abduction 5th MCP
Flexion 5th MCP

26
Q

What is the nerve supply of Abductor Digit Minimi?

A

Ulnar T1

27
Q

Where does Flexor Digiti Minimi originate?

A

Hook of Hamate
Flexor retinaculum

28
Q

Where does Flexor Digiti Minimi insert?

A

Ulnar side base proximal phalanx little finger

29
Q

What action does Flexor Digiti Minimi produce?

A

Flexes 5th MCP

30
Q

What is the nerve supply of Flexor Digiti Minimi?

A

Ulnar nerve T1

31
Q

Where does Opponens Digiti Minimi originate?

A

Hook of Hamate
Flexor retinaculum

32
Q

Where does Opponens Digiti Minimi insert?

A

Antero-medial aspect of shaft of 5th MC

33
Q

What is the action of Opponens Digiti Minimi?

A

Opposition 5th digit

34
Q

What is the nerve supply of Opponens Digiti Minimi?

A

Ulnar T1

35
Q

Where does Palmaris Brevis originate?

A

Flexor retinaculum
Palmar aponeurosis

36
Q

Where does Palmaris brevis insert?

A

Skin of palm into dermis

37
Q

What action is produced by palmaris Brevis?

A

Steadies and corrugates skin of palm to help with grip

38
Q

What is the nerve supply of Palmaris Brevis?

A

Ulnar nerve C8,T1

39
Q

What action do dorsal interossei muscles produce?

A

Abduction of fingers 2,3,4

40
Q

What is the nerve supply for all the dorsal interossei muscles?

A

Ulnar nerve C8 and T1

41
Q

What action do palmar interossei produce?

A

Adduction of digits 1,2,4,5

42
Q

What is the nerve supply of all the palmar interossei muscles?

A

Ulna nerve C8 and T1

43
Q

What do the interossei muscles contribute to via the extensor hood?

A

Extension of the IP joints
Flexion of the MCP joints
Prevention of hyper extension of the MCP
Important in pretension activities

44
Q

What do lumbricals attach into?

A

Extensor hood

45
Q

What actions are produced by the lumbricals?

A

Strong extensors of the IP joints
Weak flexors of the MCP joints
Important in pretension activities

46
Q

What are the 4 Palamar arches?

A

Proximal transverse arch
Distal transverse arch
Longitudinal arch
Oblique arch

Anatomy (15 decks)

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