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Anatomy Unit 2 > Wrist & Hand 1 > Flashcards

Wrist & Hand 1 Flashcards

1
Q

Proximal Carpal Row

A

Scaphoid, Lunate, Triquetrum, Pisiform

  • Bones are loosely joined by ligaments
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2
Q

Distal Carpal Row

A

Trapezium, Trapezoid, Capitate Hamate

  • Bones are tightly bound by ligaments which provide a rigid and stable base for articulation with the metacarpal bones
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3
Q

Radius Bony Landmarks

A

Radial Styloid Process
Lister’s Tubercle
Ulnar Notch (DRUJ)
Carpal Articular Surface

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4
Q

Ulna Bony Landmarks

A

Ulnar Styloid Process
Ulnar Head (DRUJ)

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5
Q

Radiocarpal Joint

A

Synovial - ellipsoid joint
Between Radius, Scaphoid, & Lunate

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6
Q

Radiocarpal Joint (DOF)

A

2 degrees

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7
Q

Radiocarpal Joint (Motions)

A

Flexion & Extension
Radial Deviation
Ulnar Deviation

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8
Q

Midcarpal Joint

A

Synovial - ellipsoid joint
Between Proximal Carpal Row and Distal Carpal Row

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9
Q

Midcarpal Joint (DOF)

A

2 degrees

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10
Q

Midcarpal Joint (Motions)

A

Flexion & Extension
Radial Deviation
Ulnar Deviation

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11
Q

Intercarpal Joints

A

Synovial - irregular plane joints between adjacent carpal bones

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12
Q

Intercarpal Joints (contributes)

A

contributes to gliding between carpals during radoiocarpal & midcarpal bones

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13
Q

What dictates radoiocarpal motion?

A

The shape of the distal radius

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14
Q

The distal end of the radius has a:

A

25 degree ulnar tilt - ulnar dev > rad dev
10 degree palmar tilt - flexion > extension

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15
Q

What consists of a Ray?

A

Metacarpal + phalanges for each digit

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16
Q

What type of joint is the CMC joint at the Thumb I?

A

Saddle Joint

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17
Q

How many degrees of freedom is the CMC joint at the Thumb I?

A

2 degrees

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18
Q

What are the primary and secondary motions of the CMC joint at the Thumb I?

A

Primary:
- Flexion & Extension
- Abduction & Adduction
Secondary:
- Opposition & Reposition

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19
Q

What type of joint is the CMC joint at digits II and III (index and long)?

A

Complex Saddle Joint
- rigid, stable central pillar
- very little movement

20
Q

What type of joint is the CMC joint at digits IV & V (ring and small)?

A

Saddle Joint

21
Q

What type of motion does digit IV produce at the CMC joint?

A

slight flexion & extension

22
Q

How many degrees of freedom does digit IV have at the CMC joint?

A

1 degree

23
Q

What type of motion does digit V have at the CMC joint?

A

slight flexion & extension
opposition & reposition

24
Q

How many degrees of freedom does digit V have at the CMC joint?

A

2 degrees

25
Q

What is the definition of the saddle joint?

A

articular surfaces of both bones are convex and concave
- allows motion in saggital, frontal, and transverse planes

26
Q

What does the saddle shape of the CMC thumb joint allow for?

A

Extensive joint motions

27
Q

Thumb joints move in planes – to planes of digits II-V

A

Perpendicular

28
Q

Opposition:

A

Combination of thumb CMC abduction, flexion, and medial rotation

29
Q

Reposition:

A

Combination of thumb CMC adduction, extension, and lateral rotation

30
Q

What is the correct order of joints from proximal to distal?
- PIP, CMC, MCP, DIP

A

CMC, MCP, PIP, DIP

31
Q

What would happen if thumb opposition was not possible?

A

Thumb would flex to touch the sides of four fingers

32
Q

Thumb opposition allows for…

A

improvement of stable grasp and dexterity

33
Q

Wrist Stability is provided by…

A
  1. Bony configurations of joints
  2. Ligament (static) stabilizers
  3. Dynamic Stabilizers
    - Wrist Muscles
    - Extrinsic Finger Muscles
34
Q

Wrist Extensor Muscles
1.
2.
3.

A
  1. Extensor Carpi Radialis Longus
  2. Extensor Carpi Radialis Brevis
  3. Extensor Carpi Ulnaris
35
Q

Wrist Flexor Muscles
1.
2.
3.

A
  1. Flexor Carpi Radialis
  2. Flexor Carpi Ulnaris
  3. Palmaris Longus
36
Q

Thumb MCP joint is what kind of joint?

A

Hinge Joint
1 degree

37
Q

Digits II-V MCP joints are what kind of joints?

A

Condyloid Joints
2 degrees

38
Q

All IP joints are what kind of joints?

A

Hinge Joints
1 degree

39
Q

Arches of the hand describe what?

A

Natural concavity of palmar surface of hand

40
Q

Longitudinal Arch is along what ray?

A

3rd Ray

41
Q

What is the keystone of the Longitudinal Ray?

A

2nd and 3rd MCP Joints

42
Q

Where is the Proximal Arch located?

A

Level of CMC joints - fixed arch

43
Q

What is the keystone of the Proximal Arch?

A

Capitate

44
Q

Where is the keystone of the Distal Transverse Arch?

A

2nd and 3rd MCP joints

45
Q

Where is the Distal Transverse Arch located?

A

Level of MCP joints - mobile arch

46
Q

Arch framework is supported by what?

A

Intrinsic Hand Muscles

Anatomy Unit 2 (9 decks)

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