Upper arm Flashcards
(21 cards)
Which compartments divide the upper arm?
Anterior and posterior compartments.
What is the primary function of the arm muscles?
Movements at the elbow joint: flexion, extension, pronation, supination.
Where does the long head of the biceps brachii originate?
Supraglenoid tubercle of the scapula.
Where does the short head of the biceps brachii originate?
Coracoid process of the scapula.
Where does the biceps brachii insert?
Radial tuberosity and bicipital aponeurosis.
What nerve innervates the biceps brachii?
Musculocutaneous nerve.
What is the action of the biceps brachii?
Flexes forearm (especially when supinated), assists in shoulder flexion and forearm supination.
Where does the brachialis originate?
Distal half of the anterior humerus.
Where does the brachialis insert?
Coronoid process and tuberosity of the ulna.
What nerve innervates the brachialis?
Musculocutaneous and radial nerves.
What is the action of the brachialis?
Strong flexion of the forearm, particularly when pronated.
Where does the coracobrachialis originate?
Coracoid process of the scapula.
Where does the coracobrachialis insert?
Anteromedial surface of the humerus.
What nerve innervates the coracobrachialis?
Musculocutaneous nerve.
What is the action of the coracobrachialis?
Assists in flexion and adduction of the arm.
Where does the long head of the triceps brachii originate?
Infraglenoid tubercle of the scapula.
Where does the lateral head of the triceps brachii originate?
Posterior humerus (above radial groove).
Where does the medial head of the triceps brachii originate?
Posterior humerus (below radial groove).
Where does the triceps brachii insert?
Olecranon of the ulna.
What nerve innervates the triceps brachii?
Radial nerve.
What is the action of the triceps brachii?
Extends forearm, the long head also adducts the arm.
