Triceps Brachii and Elbow Extensors | Origin, Insertion, Action, & More

The video tutorial explores the anatomy and function of the triceps brachii, focusing on its three heads: long, lateral, and medial. It discusses their origins, the triceps tendon, and insertion on the olecranon process. The triceps' role in elbow and shoulder extension is highlighted, noting its crossing of two joints. The video clarifies that forearm position does not affect triceps function, and explains the muscle's innervation by the radial nerve. Additionally, the anconeus muscle's role as an elbow extensor is covered.

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

• Anconeus

• Deltoid

• Triceps brachii

• Biceps brachii

How many heads does the triceps brachii have?

• One

• Two

• Three

• Four

Where does the long head of the triceps brachii originate?

• Supraglenoid tubercle

• Infraglenoid tubercle

• Lateral epicondyle

• Medial epicondyle

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

• Radial tuberosity

• Olecranon process

• Coracoid process

• Acromion

Why can't the triceps brachii participate in radial ulnar movements?

• It is a single-joint muscle

• It is innervated by the ulnar nerve

• It inserts on the ulna

• It inserts on the radius

Which nerve innervates the triceps brachii?

• Radial nerve

• Ulnar nerve

• Musculocutaneous nerve

• Median nerve

What is the role of the anconeus muscle in elbow extension?

• It initiates elbow flexion

• It stabilizes the shoulder joint

• It assists in elbow extension and prevents joint capsule impingement

• It is the primary elbow extensor