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Anatomy Unit 2 > Wrist and Hand 2 > Flashcards

Wrist and Hand 2 Flashcards

1
Q

Hand function is dependent on

A
  1. balanced mechanics of the wrist & hand
  2. balanced internal & external forces crossing the wrist & hand
  3. wrist & hand joint stability –If a joint is unstable, internal & external forces will create joint deformities and disrupt the mechanics of the wrist & hand
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2
Q

Wrist Stability is provided by…

A
  1. BONY CONFIGURATION OF JOINTS
  2. LIGAMENT (STATIC) STABILIZERS:
    - Extrinsic Ligaments
    - Triangular Fibrocartilage Complex
    Intrinsic Ligaments
  3. DYNAMIC STABILIZERS:
    - Wrist Muscles
    - Extrinsic Finger Muscles
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3
Q

Intact ligaments are necessary to…

A
  1. Stabilize joints
  2. Guide motion of bones
  3. Limit joint motion
  4. Transmit forces from hand to forearm
  5. Prevent dislocation of carpal bones during
    movement
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4
Q

What do extrinsic muscles do?

A

Connect radius, ulna, and carpal bones

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5
Q

What do intrinsic muscles do?

A

Connects carpal bones

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6
Q

Where is the TFCC located?

A

Ulnocarpal space

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7
Q

What is the function of the TFCC? (4)

A
  1. Supports proximal carpal row
  2. Transmits forces from hand/wrist to forearm
  3. Securely binds distal ends of radius and ulna together
    (DRUJ) to facilitate stability during forearm pronation
    & supination
  4. Allows the radius and attached carpus to freely rotate
    around a fixed ulna at distal radioulnar joint
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8
Q

What does the Palmar Radoiocarpal Ligaments prevent when taut?

A

Excessive extension

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9
Q

What does the Dorsal Radiocarpal Ligament prevent when taut?

A

Excessive Flexion

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10
Q

What happens to internal and external forces when a joint is unstable?

A

Internal and External forces will create joint deformities and disrupt the mechanics of the wrist

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11
Q

What does the Radial Ligaments prevent when taut?

A

Excessive Ulnar Deviation

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12
Q

What does the Ulnar Ligaments prevent when taut?

A

Excessive Radial Deviation

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13
Q

What is the importance of the scapulolunate ligament being intact? (2)

A
  1. Guide motion between the scaphoid
    and lunate
  2. Facilitate wrist stability
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14
Q

What motion is especially noted at the Scapulolunate ligament?

A

Gliding Motion

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15
Q

Carpal bones within the Proximal Carpal Row glide during which motions?

A

Flexion & Extension
Radial Deviation & Ulnar Deviation

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16
Q

What is hand stability provided by?

A
  1. BONY CONFIGURATION OF JOINTS
  2. LIGAMENT (STATIC) STABILIZERS
    at CMC, MCP, PIP, DIP, IP joints
  3. MUSCLE (DYNAMIC) STABILIZERS
    muscles that cross the finger joints
17
Q

What does the Thumb CMC joint ligaments prevent?

A

excessive movements of thumb CMC during grasp
and prehension

18
Q

What does the Thumb CMC joint consist of?

A

Base 1st metacarpal
Distal End Trapezium

19
Q

What do the Dorsal and Palmar Carpometacarpal Ligaments connect?

A

Distal carpal row to bases metacarpal II-V

20
Q

What do the Dorsal and Palmar Interacrpal Ligaments connect?

A

Adjacent BASES of metacarpals I-V

21
Q

What do the Dorsal and Palmar Carpometacaprl and Intercarpal ligaments prevent?

A

Excessive movements of CMC joints II, III, IV, V

22
Q

What does the Deep Transverse Metacarpal Ligaments permit and prevent?

A
  1. Permit flexible distal
    transverse arch
  2. Prevent excessive finger
    abduction
23
Q

What does the Deep Transverse Metacarpal Ligaments connect and bind to?

A
  • Connect to palmar plates at heads of MCP joints and - - loosely bind adjacent
    HEADS of metacarpals II, III, IV, V
24
Q

What are the Volar/Palmar Plates?

A

Fibrocartilaginous plates at palmar surfaces
MCP and IP/PIP/DIP joints of each digit

25
Q

What is the purpose of the Volar/Palmar Plates?

A
  • Stabilize joint when finger in extension
  • Prevent excessive hyperextension at
    MCP/PIP/DIP/IP joints
26
Q

The Volar/Palmar Plates are taut in what motion?

A

Finger Extension

27
Q

The Volar/Palmar Plates slide proximally and are loose in what motion?

A

Finger Flexion

28
Q

The Radial & Ulnar Collateral Ligaments prevent what?

A

Lateral-Medial movement of MCP/PIP/DIP/IP Joints

29
Q

Ligaments provide joint stability when –

A

Taut

Anatomy Unit 2 (9 decks)

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