Muscles of Forearm

Question 1

What is the origin insertion and action for pronator teres

Answer 1

Origin - medial epicondyle of humerus + coronoid process of ulna
Insertion - middle of lateral surface of radius
Action - pronates forearm and assists elbow flexion

Question 2

What is the origin insertion and action for pronator quadratus

Answer 2

Origin - distal part of anterior surface of shaft of ulna
Insertion - distal part of anterior surface of shaft of radius
Action - pronates forearm and stabilises the bones (inf RU jt) in weight bearing

Question 3

What are muscles are in the anterior compartment

Answer 3

Pronator teres

Pronator quadratus

Question 4

What muscles are in the posterior compartment

Answer 4

Brachioradialis

Supinator

Question 5

What is the origin insertion and action for brachioradialis

Answer 5

Origin - lateral supracondylar ridge of humerus
Insertion - lateral surface of radius above the styloid process
Action - flexes elbow when forearm is mid prone, returns forearm from full supination or full pronation to mid range

Question 6

What is the origin insertion and action for supinator

Answer 6

Origin - Lateral epicondyle of humerus, radial collateral and annular ligaments, supinator fossa and crest of ulna
Insertion - lateral posterior and anterior surfaces of proximal 1/3 of radius
Action - supinates forearm