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What is the function of the pectoralis major?

Flexes and adducts the arm at the shoulder.

What does the deltoid muscle primarily do?

Facilitates abduction at the shoulder joint.

How does the supraspinatus differ from the deltoid?

Supraspinatus specifically initiates abduction.

What action does the infraspinatus perform?

Laterally rotates the arm.

What is the role of the teres major?

Extends and medially rotates the arm.

How do the teres minor and infraspinatus work together?

Both laterally rotate the shoulder.

What does the subscapularis muscle do?

Medially rotates the arm.

What is the function of the latissimus dorsi?

Extends, adducts, and medially rotates the arm.

What does the coracobrachialis assist with?

Flexion and adduction of the arm.

What are the main actions of the biceps brachii?

Flexes the elbow and supinates the forearm.

How does the brachialis assist the biceps brachii?

Acts as a synergist for elbow flexion.

What is the primary function of the triceps brachii?

Extends the elbow.

What role does the anconeus play?

Assists in elbow extension.

What does the brachioradialis do?

Flexes the forearm at the elbow.

What is the function of the extensor carpi radialis longus?

Extends the wrist.

How do the flexor carpi radialis and palmaris longus compare?

Both flex the wrist.

What does the flexor digitorum superficialis do?

Flexes the digits and wrist.

What is the role of the supinator muscle?

Supinates the palm.

How does the pronator teres function?

Pronates the palm.

What are the thenar muscles responsible for?

Control thumb movements.

What is the function of the opponens digiti minimi?

Facilitates movement of the little finger.