Arm

Question 0

What are the three muscles in the anterior compartment of the arm and what innervates them?

Answer 0

Biceps brachii, brachialis, and coracobrachialis. All innervated by the musculocutaneous nerve.

Question 1

Only movements of the arm

Answer 1

Flexion, Extension, Pronation, Supination

Question 2

What is the muscle of the posterior compartment and what innervates it?

Answer 2

Triceps brachii. Radial Nerve

Question 3

What does the anconeus muscle do?

Answer 3

It helps the triceps extend the forearm and also abducts the ulna during pronation of the forearm.

Question 4

What is Popeye Deformity?

Answer 4

When the long head of the biceps tears from its attachment to the supraglenoid tubercle of the scapula and forms a ball near the center of the distal part of the anterior arm.

Question 5

What is the Bicipital Myotatic Reflex?

Answer 5

A routine muscle spindle test where the arm is supinated and the bicipital tendon is firmly held down and then struck to observe a response. A positive response indicates an intact musculocutaneous nerve whereas a prolonged response indicates central or peripheral NS disease.

Question 6

What is the clinical sign of radial nerve injury?

Answer 6

Wrist drop. The extensors of the wrist cannot overcome gravity and the tonus of the flexors.

Question 7

What is Ischemic Compartment Syndrome (Volkmann ischemic contracture)?

Answer 7

When a laceration occurs on the brachial artery, scar tissue can form and cause the involved muscles to shorted permanently, producing a flexion deformity.

Question 8

What is the cubital fossa?

Answer 8

A shallow triangular depression on the anterior surface of the elbow.

Question 9

What are the boundaries of the cubital fossa?

Answer 9

Superiorly=> an imaginary line connecting the medial and lateral epicondyles
Medially=> pronator teres
Laterally=> brachioradialis

Question 10

What forms the floor of the cubital fossa?

Answer 10

1. ) Brachialis

2. ) Supinator

Question 11

What forms the roof of the cubital fossa?

Answer 11

1. ) Continuity of the brachial and antebrachial fascia
2. ) Bicipital aponeurosis
3. ) Subcutaneous tissue and skin

Question 12

What are the contents of the cubital fossa?

Answer 12

1. ) Brachial, radial, and ulnar arteries
2. ) The accompanying veins of the arteries
3. ) Biceps brachii tendon
4. ) Median nerve
5. ) Radial nerve
   
   • superficial and deep branches

Question 13

What are the boundaries of the Triceps Hiatus?

Answer 13

• Teres Major
• Long head Triceps
• Humerus

Question 14

What are the contents of the Triceps Hiatus?

Answer 14

• Deep artery of arm

- Radial nerve

Question 15

What are the boundaries of the Quadrangular Space?

Answer 15

Superiorly => Teres Minor
Inferiorly => Teres Major
Medially => Long head of triceps
Laterally => Surgical neck of humerus

Question 16

What are the contents of the Quadrangular Space?

Answer 16

• Posterior Circumflex Humeral Artery

- Axillary Nerve