Week 8 - the elbow

Question 1

What are the palpable bony landmarks in the elbow

Answer 1

The medial and lateral epicondyles of the humerus

Question 2

The capitulum of the humerus

Answer 2

Located on the lateral portion of the distal articular surface of the humerus
It articulates with the head of the fibula

Question 3

The trochlea of the humerus

Answer 3

Located on the medial portion of the distal surface of the humerus
Articulates with the ulna

Question 4

Radial fossa

Answer 4

A slight depression on humerus that gives space to the head of the fibula to fit during elbow flexion

Question 5

Coronoid fossa

Answer 5

A depression that fits with the coronoid process of the ulna during elbow flexion

Question 6

Radial tuberosity

Answer 6

Located proximally and medially on the radias and provides insertion point for the biceps

Question 7

Radial tuberosity

Answer 7

Located proximally and medially on the radius and provides insertion point for the biceps

Question 8

The olecranon of the ulna

Answer 8

Located at the posterior compartment of the ulna
It provides attachment for the triceps

Question 9

The radioulnar joint

Answer 9

There is a superior radioulnar joint and an inferior radioulnar joint
They allow for pronation and supination

Question 10

Ligaments in the elbow

Answer 10

The medial (ulna) collateral ligament
The lateral (radial) collateral ligament
Quadrate ligament
Annular ligamemt

Question 11

Annular ligament

Answer 11

Strong band of fibres that wrap around the head of the radius and attach to the ulna, thus stabilizing the radius bone in the elbow joint

Question 12

Interosseous membrane

Answer 12

Located between the radius and ulna
Provides stability and flexibility between the two bones

Question 13

Muscles that create flexion

Answer 13

Biceps brachii,, brachialis, brachioradialis

Question 14

What compartment of the elbow produces flexion/extension

Answer 14

The anterior compartment produces flexion (biceps brachii, brachialis and brachioradialis)
The posterior compartment produces extension (triceps)

Question 15

Why are the elbow flexors able to produce elbow flexion

Answer 15

They all cross over the elbow joint

Question 16

Muscles that create extension

Answer 16

Triceps brachii and anconeus

Question 17

What happens during pronation

Answer 17

the distal end of the radius rotates around the ulna from its position on the lateral side of the wrist to the medial side of the wrist
contraction of the aconeous creates abduction of the ulna

Question 18

Muscles that create pronation

Answer 18

Pronator quadratus, pronator teres

Question 19

Muscles that create supination

Answer 19

Biceps brachii, supinator