Posterior Arm Compartment | Triceps Brachii & Anconeus

The video tutorial covers the anatomy of the arm, focusing on the posterior compartment. It details the triceps brachii muscle, its three heads, origins, and functions, including elbow extension. The video also discusses the anconeus muscle, its role in elbow stabilization, and its relationship with the triceps. Blood supply and innervation of these muscles are explained, highlighting the radial and axillary nerves.

What is the primary muscle found in the posterior compartment of the arm?

• Triceps brachii

• Biceps brachii

• Brachialis

• Coracobrachialis

Which head of the triceps brachii is responsible for shoulder joint control?

• None of the above

• Lateral head

• Medial head

• Long head

Where does the long head of the triceps brachii originate?

• Radial groove

• Infraglenoid tubercle of the scapula

• Lateral epicondyle of the humerus

• Olecranon process

What is the common insertion point for all three heads of the triceps brachii?

• Infraglenoid tubercle

• Lateral epicondyle

• Radial groove

• Olecranon of the ulna

Which artery primarily supplies blood to the triceps brachii?

• Deep brachial artery

• Posterior circumflex humeral artery

• Axillary artery

• Recurrent interosseous artery

What is the main function of the anconeus muscle?

• Flexion of the elbow

• Pronation of the forearm

• Extension of the shoulder

• Assisting in elbow extension and preventing impingement

Which nerve innervates both the triceps brachii and the anconeus muscle?

• Ulnar nerve

• Musculocutaneous nerve

• Median nerve

• Radial nerve