Wrist and Hand Flashcards

1
Q

where is the thenar eminence located?

A

thumb side (radial side)

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2
Q

where is the hypothenar eminence located?

A

pinky side (ulnar side)

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3
Q

what do the hypothenar and thenar eminences contribute to?

A

better grasp

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4
Q

how are the palmar flexion creases formed?

A

by the amount of movement you do

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5
Q

what is the CMC joint?

A

carpometacarpal joint

carpal bone to base of metacarpal bone

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6
Q

what is the MCP joint?

A

metacarpophalangeal joint

head of metacarpal to base of proximal phalanx

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7
Q

what is the PIP joint?

A

proximal interphalangeal joint

head of proximal phalanx to base of middle phalanx

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8
Q

what is the DIP joint?

A

distal interphalangeal joint

head of middle phalanx to base of distal phalanx

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9
Q

where are the peripheral joints?

A

first, fourth, and fifth metacarpals

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10
Q

where are the central joints?

A

second and third metacarpals

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11
Q

what is the most important aspect of active grasp?

A

the mobility of the CMC joint

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12
Q

what kind of shape do the carpal bones/palmer surface of the hand make, and what is it good for?

A

bowl shaped (concavity)

good for grip

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13
Q

is there as much movement at the CMC joints of the second and third metacarpal as there is at the first, fourth, and fifth?

A

no, the peripheral joints provide more movement

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14
Q

what type of joint is the CMC joint of the thumb?

A

a sellar/saddle joint

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15
Q

what makes a joint a sellar/saddle joint?

A

there ALWAYS has to be a third movement involved

in terms of the thumb, it’s flex/ext, abd/add, AND opposition

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16
Q

what does having the ability to oppose differentiate for us?

A

separates us from other species

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17
Q

where are the two axis of the CMC joint of the thumb?

A

frontal axis through the tripezium

sagittal axis through the base of the first metacarpal

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18
Q

what shape is the MCP joint?

A

condylar shape – concave on top of convex

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19
Q

when in FLEXION, are the collateral ligaments taut or looser?

A

taut

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20
Q

when in EXTENSION, are the collateral ligaments taut or looser?

A

looser

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21
Q

what is another term for the palmar ligaments?

A

the palmar plates

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22
Q

what is the palmar ligament made up of?

A

fibrocartilaginous pads

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23
Q

what do the palmar ligaments/plates do?

A

holds the tendons in place for active grasp

24
Q

what do the deep transverse ligaments do?

A

connects the metacarpal heads

25
Q

the extensor hoods of the fingers are also known as what?

A

expansion hoods

26
Q

where are the extensor hoods located?

A

at the CMC joint

27
Q

what do the extensor hoods become?

A

expansion of the extensor digitorum tendon becomes a ligamental/connective tissue structure that anchors the tendon on to the bony structure of the finger

28
Q

what do the extensor hoods do?

A

protects the dorsal surface of the joints, then creates a fulcrum point, which gives that tendon the ability to release

29
Q

what type of joints are the PIP and DIP joints?

A

hinge joitns

30
Q

what action do the PIP and DIP joints provide?

A

flexion and extension

31
Q

what is the other name for the palmar plates (yes, there’s a third name)

A

volar plates

32
Q

what do the palmar plates do?

A

protects the joint on the palmar surface and prevents hyperextension

33
Q

what is important to know about the palmaris longus?

A

it is not present in everyone/most, some people could also only have it on one side

34
Q

what does the palmar aponeurosis do?

A

connects to the distal edge of the flexor retinaculum and provides an insertion point for some flexor muscles

35
Q

what is Dupuytren’s?

A

it is a type of flexion contracture, especially at the MCP joint.

36
Q

what is the fibrous digital sheath?

A

ligamentous tissue that enclose synovial sheaths and tendons of the digits

37
Q

what does the fibrous digital sheath do?

A

provides strength and integrity at the joints

38
Q

what is the orientation of the fibers of the fibrous digital sheath?

A

cross hatch

39
Q

what is the benefit of the orientation of the fibrous digital sheath?

A

provides more strength/stability for holding tendons over the JOINT

ONLY HERE TO provide more strength

40
Q

where is the radial bursa located?

A

flexor pollicis longus

41
Q

where is the ulna bursa located?

A

flexor digitorum superficialis and flexor digitorum profundus

42
Q

what do the digital synovial tendon sheaths do?

A

lubricates and secretes synovial fluid onto the tendon to allow ease of movement

43
Q

what can cause trigger finger?

A

swelling of the synovial sheaths, which can pull the tendons of the fingers down and create trigger finger

44
Q

what are the only two tendons that create active grasp in a flexed position?

A

flexor digitorum superficialis and flexor digitorum profundus

45
Q

what is the role of the “lizard’s tongue” ending of the flexor digitorum superficialis?

A

allows passageway of the FDP tendon to attach to the distal phalanx

46
Q

what holds the extensor tendon sheaths together?

A

the extensor retinaculum

47
Q

what does the median nerve run under?

A

the palmaris longus, THRU carpal tunnel

48
Q

what is median nerve palsy also known as?

A

Pope’s Blessing*

Ape Hand

49
Q

what is median nerve palsy?

A

loss of the thenar muscles, results in the loss of opposition in the thumb

50
Q

where does the ulnar run ABOVE?

A

above the flexor retinaculum

51
Q

what is ulnar nerve palsy also known as?

A

Claw Hand

52
Q

what is ulnar nerve palsy?

A

loss of flexing action at the MCP joints

53
Q

what is radial nerve palsy also known as?

A

Wrist drop

54
Q

what is radial nerve palsy?

A

loss of all muscles capable of producing extension of the wrist DUE TO A COMPLETE LESION/SEVERING OF THE RADIAL NERVE

55
Q

What is ulnar nerve entrapment?

A

A painful disorder of the lower arm and wrist caused by compression of the ulnar nerve at the wrist in Guyon’s canal or in the cubital tunnel