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625: Biomechanics & Kinesiology > Hand > Flashcards

Hand Flashcards

1
Q

How many muscles drive the 19 bones and 19 articulations within the hand?

A

29

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2
Q

3 types of articulations of the hand/ray

A
  • Carpometacarpal (CMC) joint
  • Metacarpophalangeal (MCP) joint
  • Interphalangeal (IP) joints
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3
Q

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

A

saddle joint

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4
Q

The trapezium is con___ in the longitudinal axis

A

concave

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5
Q

The trapezium is con___ in the transverse axis

A

convex

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6
Q

The 1st metacarpal is con___ in the longitudinal axis

A

convex

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7
Q

The 1st metacarpal is con___ in the transverse axis

A

concave

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8
Q

How many degrees of freedom are there at the CMC joint? What are they?

A

2

  • Abduction/Adduction
  • Flexion/Extension
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9
Q

Abduction and adduction occur in ____ plane

Flexion and extension occur in _____ plane

A

sagittal

frontal

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10
Q

Axis of rotation for each plane of movement passes through con___ member of articulation

A

convex

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11
Q

Describe the arthrokinematics of the thumb during full abduction

A

The first MC rolls palmarly and slides dorsally

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12
Q

Describe the arthrokinematics of the thumb during full adduction

A

The 1st MC rolls dorsally and slides palmarly

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13
Q

Where is the axis of rotation for abduction and adduction?

A

base of the 1st metacarpal

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14
Q

Describe the arthrokinematics of the thumb during full extension

A

The concave metacarpal rolls and slides laterally on the convex triquetrum

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15
Q

Describe the arthrokinematics of the thumb during full flexion

A

The concave metacarpal rolls and slides medially on the convex triquetrum

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16
Q

Where is the axis of rotation during thumb flexion and extension?

A

through the trapezium

17
Q

How many degrees of freedom are there at the MCP joints? What are they?

A

2

  • Abduction/Adduction
  • Flexion/Extension
18
Q

In the MCP joints the metacarpal is con___ and the proximal phalange is con___. This means that with all motions roll in slide occur in the ____ direction as the movement.

A

convex
concave

same

19
Q

Abduction of the digits 2-5 is powered by what muscles?

A

dorsal interosseus muscles

20
Q

What is the axis of rotation for abduction/adduction of digits 2-4?

A

Through the head of the metacarpal (AP direction)

21
Q

How many degrees of freedom are there at the interphalangeal joints? What are they?

A

1

- flexion/extension

22
Q

In the interphalangeal joints the proximal phalange is con___ and the distal/middle phalange is con___. This means that with all motions roll in slide occur in the ____ direction as the movement.

A

convex
concave

same

625: Biomechanics & Kinesiology (15 decks)

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