Myology Of The Elbow

Question 1

Elbow Extension

Answer 1

Triceps brachii, Anconeus

Question 2

Elbow Flexion

Answer 2

Biceps brachii, brachioradialis, brachialis

Question 3

Elbow Pronation

Answer 3

Pronator teres, pronator quadratus

Question 4

Elbow Supination

Answer 4

Supinator, coracobrachialis

Question 5

Triceps Brachii

Answer 5

O- Long head: Infraglenoid tubercle
Lateral head: posterior, lateral surface of proximal 1/2 of humerus
Medial head: Posterior humerus, below and medial to lateral head.
I- Posterior aspect of olecranon
N- Radial nerve C6-C8/ T1
A- All heads: extension at elbow
Long head: Extend and abduct shoulder

Question 6

Aconeus

Answer 6

O- Lateral epicondyle of the humerus
I- Lateral surface of olecranon and upper 1/4 of posterior ulna
N- Radial nerve C7,8
A- Extend the elbow

Question 7

Biceps Brachii

Answer 7

O- Long head: Supraglenoid tubercle
Short head: Coracoid process
I- Radial tuberosity
N- Muscular cutaneous nerve C5,6
A- Forearm supination and flexion

Question 8

Brachioradialis

Answer 8

O- Upper 2/3rds of anterior surface of lateral supracondylar ridge of humerus.
I- Lateral surface of radius just above styloid process.
N- Radial Nerve C5-C7
A- Elbow flexion
Returns arm into mid position from extreme pronation/supination

Question 9

Brachialis

Answer 9

O- Distal 2/3rds of anterior surface of humeral shaft.
I- Ulna tuberosity, Elbow joint capsule, inferior coronoid process
N- Radial Nerve C5-C6
A- Elbow flexion
Pulls joint capsule from joint during flexion

Question 10

Pronator Teres

Answer 10

O- Humeral head: Lower part of medial supracondylar ridge, Medial epicondyle.
Ulnar Head: Pronator ridge (medial to coronoid process).
I- Middle to lateral surface on elbow.
N- Median Nerve C6-C7
A- Pronate Arm, assist to flex elbow

Question 11

Pronator Quadratus

Answer 11

O- Distal 1/4 anterior surface of ulna.
I- Distal 1/4 anterior surface of radius, just superior to ulna notch.
N- Median Nerve C8, T1
A- Protects the inferior radioulnar joint, pronates the arm.

Question 12

Supinator

Answer 12

O- Lateral epicondyle, radial collateral ligament, Annular ligament.
I- Posterior, lateral and anterior aspects of proximal radius.
N- Radial Nerve C5, C6
A- Supinate the forearm.

Question 13

Coracobrachialis

Answer 13

O- Apex of coranoid process, shares tendon with short head of biceps tendon.
I- Midway down medial aspect of humeral shaft
N- Muscular cutaneous nerve C6, C7
A- Flexion at elbow (very weak)

Question 14

Cubital Fossa

Answer 14

Triangular space on the anterior aspect of the elbow.
Lateral border: Brachioradialis
Medial border: Pronator teres
Apex: 2 muscles meet
Floor: Brachialis
Roof: Deep and superficial fascia.

Contents (Lateral to medial): Median nerve, brachial artery, biceps tendon and the radial nerve.
Can palpate the pulse of the brachial artery.