Biceps Brachii Flashcards
(13 cards)
What is the origin of the short head of the biceps brachii?
Coracoid process of the scapula.
What is the origin of the long head of the biceps brachii?
Supraglenoid tubercle of the scapula.
Where does the biceps brachii insert?
Radial tuberosity and bicipital aponeurosis.
Which nerve supplies the biceps brachii?
Musculocutaneous nerve (C5–C7).
What are the main actions of the biceps brachii?
Flexes elbow and shoulder; supinates forearm.
Which part of the biceps brachii tendon forms the bicipital aponeurosis?
The distal tendon continues as the bicipital aponeurosis medially.
What is the function of the bicipital aponeurosis?
Protects underlying structures like the brachial artery and median nerve; helps transmit force from biceps contraction.
Why is the biceps brachii a powerful supinator?
Because its insertion on the radial tuberosity allows it to rotate the radius over the ulna during supination.
Which action is most affected when the biceps brachii is paralyzed?
Forearm supination (especially when the elbow is flexed).
Name two joints crossed by the biceps brachii.
Shoulder joint and elbow joint.
Does the biceps brachii participate in shoulder movement?
Yes, it assists in shoulder flexion.
Which muscle lies deep to the biceps brachii in the arm?
Brachialis.
What is the clinical importance of the bicipital aponeurosis?
It protects vital structures during venepuncture in the cubital fossa.
