Apparato locomotore 34: Muscoli del Braccio

Summary

This informative video delves into the anatomy of the arm's muscles, categorizing them into anterior and posterior groups. It highlights the biceps brachii, with its two heads responsible for flexion and supination; the coracobrachialis, which flexes and adducts the arm; and the brachialis, a key flexor of the elbow. The triceps brachii, the sole posterior muscle, is detailed for its three heads that primarily extend the forearm and assist in shoulder adduction. Overall, the video offers a comprehensive overview of these essential muscles and their functions.

Takeaways

• 😀 The arm muscles are divided into two main categories: anterior and posterior.
• 💪 The biceps brachii consists of two heads: the long head and the short head, each with distinct origins.
• 📍 The long head of the biceps originates from the supraglenoid tuberosity of the scapula.
• 📍 The short head originates from the apex of the coracoid process and merges with the long head to form a single tendon.
• 🔄 The biceps brachii flexes the forearm and assists in shoulder adduction, as well as supinates the forearm when in a pronated position.
• 🦵 The coracobrachialis originates from the coracoid process and inserts along the anterior margin of the humerus.
• 🔄 The coracobrachialis primarily flexes and adducts the arm.
• 🏋️ The brachialis, located in the distal half of the arm, is a strong flexor of the forearm at the elbow.
• 📍 The triceps brachii has three heads: long, lateral, and medial, each with different origins on the scapula and humerus.
• 🔄 The triceps brachii is the main extensor of the forearm at the elbow and also contributes to the adduction of the humerus.

Q & A

What are the two categories of muscles in the arm discussed in the video?

The two categories are the anterior muscles, which include the biceps brachii, coracobrachialis, and brachialis, and the posterior muscle, which is the triceps brachii.

What is the origin of the long head of the biceps brachii?

The long head of the biceps brachii originates from the supraglenoid tuberosity of the scapula.

Where does the biceps brachii insert?

The biceps brachii inserts on the radial tuberosity.

What is the function of the biceps brachii?

The biceps brachii flexes the forearm at the elbow and also acts as a supinator when the forearm is pronated.

What muscle is located deep to the biceps brachii?

The coracobrachialis and brachialis muscles are located deep to the biceps brachii.

What is the origin and insertion of the coracobrachialis?

The coracobrachialis originates from the coracoid process of the scapula and inserts on the anterior margin of the humerus at its mid-third.

What role does the brachialis play in arm movement?

The brachialis flexes the forearm at the elbow and is located beneath the biceps brachii.

How many tendons does the triceps brachii have, and where does it insert?

The triceps brachii has three heads that originate from different sites and inserts onto the olecranon of the ulna.

What are the origins of the three heads of the triceps brachii?

The long head originates from the infraglenoid tubercle of the scapula, the lateral head from the upper half of the posterior humerus, and the medial head from the lower half of the posterior humerus.

What is the main action of the triceps brachii?

The main action of the triceps brachii is to extend the forearm at the elbow joint.