Elbow bones

Question 1

How many bones and which ones compose the elbow?

Answer 1

3 bones: the ulna, radius and humerus

Question 2

Which bone is on the lateral side and which one on the medial side of the forearm?

Answer 2

The ulna is always on the medial side and the radius is on the lateral side (same as the thumb) of the forearm

Question 3

The distal end bony points of the humerus on the posterior side are:

Answer 3

olecranon fossa (receives the olecranon process of ulna), lateral and medial epicondyle, lateral and medial supracondylar ridges,

Question 4

The distal end bony points of the humerus on the anterior side are:

Answer 4

coronoid fossa (at the medial side of the humerus,proximal to trochlea, receives the coronoid process of ulna), radial fossa (on the lateral side of the humerus,proximal to the capitulum, receives the head of the radius), the trochlea (articulates with the trochlea notch of ulna making a hinge joint)

Question 5

What are the joints in the elbow?

Answer 5

• The distal humerus and the proximal ulna articulate to form the humero-ulnar joint
• The distal humerus articulates with the radius to form the humero-radial joint

Question 6

The ulna sits on the medial or lateral side of forearm?

Answer 6

Sits on the medial side of the forearm and runs parallel with the radius bone

Question 7

Ulna allows supination and pronation because it is a

Answer 7

stabilising bone allowing the radius to move around it

Question 8

At the proximal ulnar end the joints present are

Answer 8

• humero-ulnar joint (elbow joint)

- proximal radio-ulnar joint

Question 9

Bony points of the proximal end of the ulna are:

Answer 9

• olecranon process (pos./triceps brachi insertion/ articulates with the olecranon fossa of humerus)
• coronoid process (ant./brachialis insertion)
• trochlear notch (articulates with trochlea of humerus)
• radial notch (lateral aspect/ accomodates the head of the radius

Question 10

The ligament that attaches to the anterior and posterior of radial notch and wraps around the head of radius holding it in place

Answer 10

ANULAR LIGAMENT

Question 11

The ANULAR LIGAMENT

Answer 11

It attaches to the anterior and posterior of radial notch and wraps around the head of radius holding it in place

Question 12

The ulnar shaft has how many borders and surfaces, name them

Answer 12

3 borders:

• anterior
• posterior
• interosseous

3 surfaces:

• anterior
• posterior
• medial

Question 13

The distal end of the ulna is _____ than the proximal end in diameter

Answer 13

smaller

Question 14

The head of ulna (distal) articulates with the ulnar _____ of the ______

Answer 14

notch/ radius

Question 15

Distal ulna has a styloid process, articular disc present and its not part of the ______ joint

Answer 15

joint

Question 16

The humerus articulates with the ulna and the radius, the articulations are known as

Answer 16

> humero-ulnar joint

>humero-radial joint

Question 17

The radius is positioned on the _____ side of the forearm

Answer 17

lateral

Question 18

The radius pivots around the

Answer 18

ulna