muscles of the arm Flashcards
(13 cards)
Which muscles are the primary flexors of the arm?
Coracobrachialis; biceps brachii; and brachialis muscles.
What is the main action of the coracobrachialis muscle?
Flexion and adduction of the arm at the shoulder joint.
What are the main actions of the biceps brachii muscle?
Supination and flexion of the forearm; and flexion of the arm at the shoulder joint.
What is the main action of the brachialis muscle?
Flexion of the forearm at the elbow joint.
What nerve supplies the primary flexors of the arm?
Musculocutaneous nerve.
Which muscles are the primary extensors of the arm?
Triceps brachii and anconeus muscles.
What is the main action of the triceps brachii muscle?
Extension of the forearm at the elbow joint.
What is the main action of the anconeus muscle?
Assists the triceps in the extension of the forearm.
What nerve supplies the primary extensors of the arm?
Radial nerve.
Which nerve supplies all the muscles in the anterior (flexor) compartment of the arm?
Musculocutaneous nerve (C5-C7).
Which nerve supplies all the muscles in the posterior (extensor) compartment of the arm?
Radial nerve (C5-T1).
Does the median nerve have any branches in the arm?
No; the median nerve (C5-T1) has no branches in the arm.
Does the ulnar nerve have any branches in the arm?
No; the ulnar nerve (C8-T1) usually does not have any major branches in the arm.
