Chaper 4 Hands And Fingers

Question 1

What is the ulnar notch?

Answer 1

A small depression on the medial aspect of the distal radius.

The head of the ulna fits into the ulnar notch to form the distal radioulnar joint.

Question 2

Where is the head of the ulna located?

Answer 2

Near the wrist at the distal end of the ulna.

Question 3

Where is the head of the radius located?

Answer 3

At the proximal end of the radius near the elbow joint.

Question 4

What is the body (shaft) of both the radius and ulna called?

Answer 4

The long midportion.

Question 5

Which bone of the forearm is directly involved in the wrist joint?

Answer 5

The radius.

Question 6

What happens during the act of pronation?

Answer 6

The radius rotates around the more stationary ulna.

Question 7

What are the two beaklike processes of the proximal ulna called?

Answer 7

The olecranon and the coronoid processes.

Question 8

What is the large concave depression that articulates with the distal humerus in the ulna called?

Answer 8

The trochlear (semilunar) notch.

Question 9

What is the small, shallow depression located on the lateral aspect of the proximal ulna called?

Answer 9

The radial notch.

Question 10

Proximal radioulnar joint

Answer 10

Articulation between the head of the radius and the radial notch of the ulna

Located near the elbow joint

Question 11

Radial notch (on ulna)

Answer 11

Depression on the ulna that articulates with the head of the radius

Forms part of the proximal radioulnar joint

Question 12

Head (of radius)

Answer 12

The round, disc-shaped structure at the proximal end of the radius bone

Articulates with the radial notch of the ulna

Question 13

Neck (of radius)

Answer 13

Constricted region of the radius bone just below the head

Connects the head to the body of the radius

Question 14

Radial tuberosity

Answer 14

Bony projection on the medial side of the radius, just below the neck

Serves as the attachment site for the biceps brachii muscle

Question 15

Olecranon process

Answer 15

Prominent bony projection on the proximal end of the ulna

Forms the point of the elbow

Question 16

Coronoid process

Answer 16

Anterior projection on the proximal end of the ulna

Located below the olecranon process

Question 17

Coronoid tubercle (medial)

Answer 17

Small bony prominence on the medial side of the coronoid process

Aids in stabilizing the elbow joint

Question 18

Body (shaft) - Radius

Answer 18

The main cylindrical portion of the radius bone

Extends from the neck to the distal end of the bone

Question 19

Ulnar notch (on radius)

Answer 19

Notch on the radius that articulates with the head of the ulna

Forms part of the distal radioulnar joint

Question 20

Head (of ulna)

Answer 20

Prominent, knob-like structure at the distal end of the ulna bone

Articulates with the ulnar notch of the radius

Question 21

Styloid process (ulna)

Answer 21

Pointed bony projection at the distal end of the ulna

Provides attachment for ligaments in the wrist joint

Question 22

Styloid process (radius)

Answer 22

Pointed bony projection at the distal end of the radius

Aids in stabilizing the wrist joint

Question 23

Lateral (distal radioulnar joint)

Answer 23

Articulation between the head of the ulna and the ulnar notch of the radius

Located near the wrist joint on the lateral side

Question 24

Medial

Answer 24

Refers to the side of the body that is closer to the midline

Opposite of lateral

Question 25

What is the lateral epicondyle?

Answer 25

The lateral epicondyle is the small projection on the lateral aspect of the distal humerus above the capitulum. ## Footnote Example sentence: The lateral epicondyle is easily identified on an X-ray image of the elbow.

Question 26

What is the medial epicondyle?

Answer 26

The medial epicondyle is larger and more prominent than the lateral epicondyle and is located on the medial edge of the distal humerus. ## Footnote Additional information: The medial epicondyle can be used as a reference point for proper positioning of the elbow during imaging.

Question 27

What are the two shallow anterior depressions on the distal humerus?

Answer 27

The two shallow anterior depressions are the coronoid fossa and the radial fossa. ## Footnote Example sentence: The coronoid fossa and radial fossa are important landmarks for identifying specific structures in the elbow joint.

Question 28

What is the deep posterior depression of the distal humerus?

Answer 28

The deep posterior depression of the distal humerus is the olecranon fossa. ## Footnote Additional information: The olecranon fossa is where the olecranon process of the ulna fits when the arm is fully extended.

Question 29

What is depicted by specific fat pads located within the deep olecranon fossa?

Answer 29

Soft tissue detail is depicted by specific fat pads located within the deep olecranon fossa. ## Footnote Example sentence: The presence or absence of fat pads in the olecranon fossa can provide valuable information for diagnosing elbow joint trauma.

Question 30

What parts of the proximal radius and ulna are clearly shown in the lateral view of the elbow?

Answer 30

The head and neck of the radius, the radial tuberosity, and the trochlear (semilunar) notch are clearly shown in the lateral view of the elbow. ## Footnote Additional information: The trochlear notch is a large concave structure that articulates with the humerus to form the elbow joint.