Muscles of the Elbow & Radioulnar Joint

Question 1

Biceps Brachii (Basic Origin; Insertion; and Action)

Answer 1

O (Long head): Above superior lip of glenoid fossa.
O (Short head): Coracoid process.
I: Tuberosity of Radius
A: Elbow flexion and Supination of RU Joint

Question 2

Brachialis

Answer 2

O: Distal half, anterior shaft of humerus.
I: Coronoid process of Ulna.
A: Elbow flexion.

Question 3

Brachioradialis

Answer 3

O: Distal lateral condyloid ridge of humerus.
I: Distal end of radius, styloid process.
A: Elbow flexion, Pronation of forearm from SUP to NEUT, and Supination of forearm from PRO to NEUT.`

Question 4

Pronator Teres

Answer 4

O: Humerus, medial side of Ulna.
I: Middle third, lateral surface of radius.
A: Pronation of RU Joint.

Question 5

Pronator Quadratus

Answer 5

O: Distal fourth, anterior of Ulna.
I: Distal fourth, anterior of Radius.
A: Pronation of RU Joint.

Question 6

Triceps Brachii

Answer 6

O: Posterior surface of humerus (lateral and medial head) and infraglenoid tubercle (long head).
I: Olecranon process of Ulna.
A: Elbow extension, Shoulder extension.

Question 7

Anconeus

Answer 7

A: Elbow extension.

Question 8

Supinator

Answer 8

A: Supination RU joint.