KIN 100 - Bones and Joints of the Wrist (lecture 10)

Question 1

List the three types of bones in the hand and wrist and how many of each bone

Answer 1

8 carpals
5 metacarpals
14 phalanges

Question 2

What are the carpal bones lateral to medial in the proximal row (4)

Answer 2

1. Scaphoid
2. Lunate
3. Triquetrum
4. Pisiform

Question 3

What are the carpal bones lateral to medial in the distal row (4)

Answer 3

1. Trapezium
2. Trapezoid
3. Capitate
4. Hamate

Question 4

Which carpal bones have a tubercle

Answer 4

scaphoid and trapezium

Question 5

How many phalanges does the thumb have

Answer 5

2: proximal and distal

Question 6

How many phalanges does digits 2 through 5 have

Answer 6

3: proximal, middle, distal

Question 7

Descibe the radiocarpal joint

Answer 7

• aka the wrist joint
• condyloid, synovial joint
• allows flexion, extension, abduction, adduction

Question 8

What does the distal end of the radius and the articular disc of the distal radioulnar joint (DRUJ) articulate with

Answer 8

proximal row carpal bones (scaphoid, lunate, triquetrum)
- no ulna

Question 9

What are the intrinsic ligaments of the radiocarpal joint (4)

Answer 9

1. Dorsal radiocarpal ligament
2. Palmar radiocarpal ligament
3. Ulnar collateral ligament
4. Radial collateral ligament

Question 10

What ligaments of the radiocarpal joint ensure that the hand follows the radius during pronation and supination

Answer 10

Palmar and dorsal radiocarpal ligaments

Question 11

Describe Intercarpal joints

Answer 11

• Joints between adjacent bones in the proximal row, joint between bones in the distal row
• pisotriquetral joint
• plane joint
• gliding movements that increase the range of motion of the radiocarpal joint

Question 12

Describe the midcarpal joint

Answer 12

• a compound joint between the first and second rows of carpals that helps to augment flexion of the radiocarpal joint
• more than one synovial joint (compound)

Question 13

Describe the carpometacarpal joint of the thumb

Answer 13

the trapezium articulates with the first metacarpal

• classified as a saddle, synovial joint
• allows flexion, extension, abduction, adduction, circumduction, opposition

Question 14

Describe the carpometacarpal joints of digits 2 through 5

Answer 14

• the distal row of carpals articulates with th bases of metacarpals 2,3,4, and 5
• plane/synovial joints
• very little movement occurs at these joints

Question 15

describe Metacarpophalangeal joints

Answer 15

the heads of the metacarpals articulate with the bases of the proximal phalanges
- condyloid, synovial joints

• flexion, extension, abduction, adduction

Question 16

describe interphalangeal joints

Answer 16

The head of one phalanx articulates with the base of the next phalanx

• higne, synovial joint
• flexion and extension only