Hand

Question 1

Hand Function

Answer 1

• important sensory organ for perception of one’s surroundings
• primary effector organ for complex motor behaviors
• helps express emotions through gesture, touch, music, and art

Question 2

Articulations in the Hand

Answer 2

Carpometacarpal (CMC) joint
Metacarpophalangeal (MCP) joint
Interphalangeal (IP) joint
Proximal interphalangeal (PIP joint
Distal interphalangeal (DIP) joint

Question 3

What type of joint is the thumb?

Answer 3

Saddle Joint

Question 4

Characteristic Features of Thumb

Answer 4

-longitudinal diameter of articular surface of trapezium generally concave from palmar to dorsal direction
- transverse diameter on articular surface of trapezium is convex in ML direction

Question 5

Kinematics

Answer 5

CMC has 2 degrees of freedom
abd and add occur in saggital plane
flex and ext occur in frontal plane
axis of rotation for each plane of movement passes through convex member of articulation

Question 6

Arthrokinematics of CMC of thumb

Answer 6

Abduction: roll anterior, slide posterior
Flexion: roll and slide both medial
Extension: roll and slide both lateral

Question 7

Metacarpophalangeal Joint movement

Answer 7

• flexion and extension in sagittal plane
• abduction and adduction in frontal plane

Question 8

Arthrokinematics of MCP joints

Answer 8

flexion: roll and slide anterior
extension : roll and slide posterior
abduction: roll and slide lateral

Question 9

Interphalangeal joints movement

Answer 9

flexion and extension

Question 10

Taut during thumb CMC abduction

Answer 10

anterior oblique ligament
intermetacarpal ligament

Question 11

Taut during thumb Flexion

Answer 11

radial collateral ligament

Question 12

Taut during thumb extension

Answer 12

anterior oblique ligament

Question 13

Taut during MCP Flexion

Answer 13

radial collateral ligament

Question 14

Taut during MCP extension

Answer 14

palmar plate

Question 15

Taut During MCP abduction

Answer 15

ulnar collateral ligament