elbow muscles

Question 1

the origin, insertion, and action of biceps brachii

Answer 1

O: Long head - supraglenoid tubercle (B)
Short head - coracoid process (A)
I: Radial tuberosity

A : Elbow flexion,
Forearm supination
Assists: shoulder flexion

Question 2

the origin, insertion, and action of brachioradialis

Answer 2

O: Lateral supracondylar ridge of the humerus

I: Styloid process of the radius

A: Elbow flexion

Question 3

the origin, insertion, and action of triceps brachii

Answer 3

O: Long head - Infraglenoid
tubercle (A)

Lateral head - Inferior to
greater tubercle of
posterior humerus (B)

Medial head - Posterior
surface of humerus (C)

I: Olecranon process of ulna

A: Elbow extension

Question 4

the origin, insertion, and action of anconeus

Answer 4

O:Lateral epicondyle of humerus

I:Lateral and inferior to olecranon process of ulna

A: Not a prime mover in any joint action

• Stabilizer in pronation/supination
• Prevents annular ligament from getting
  pinched in olecranon fossa

Question 5

the origin, insertion, and action of pronator teres

Answer 5

O: Medial epicondyle humerus and coronoid process ulna

I: Lateral aspect of radius at its midpoint

A: Pronation,
Assists elbow flexion

Question 6

the origin, insertion, and action of pronator quadratus

Answer 6

O: Distal 1/4 of ulna
I: Distal 1/4 of radius
A: Forearm pronation

Question 7

the origin, insertion, and action of supinator

Answer 7

O: Lateral epicondyle of humerus and adjacent ulna

I:Anterior surface of proximal radius

A: Forearm supination

Question 8

which muscles has Musculocutaneous C5,C6

Answer 8

brachial and biceps

Question 9

which muscles has radial nerve

Answer 9

brachiradialirs, Anconeus, triceps, supinator

Question 10

which muscles has median nerve

Answer 10

pronator teres and quadratus