Muscle
Biceps brachii
Chief supinator of the forearm
High-yield
Strongest supinator (esp. flexed elbow) - "corkscrew" action. Musculocutaneous nerve; biceps reflex tests C5-C6.
Overview
The two-headed anterior arm muscle that flexes the elbow and is the most powerful supinator of the forearm, especially with the elbow flexed.
Reference facts
- Origin
- Long head: supraglenoid tubercle of the scapula. Short head: apex of the coracoid process
- Insertion
- Radial tuberosity and, via the bicipital aponeurosis, the deep forearm fascia
- Action
- Supinates the forearm and flexes the elbow; long head weakly flexes the arm
- Innervation
- Musculocutaneous nerve (C5, C6)
- Blood supply
- Brachial artery (muscular branches)
Frequently asked questions
What does the biceps brachii do?
The biceps brachii supinates the forearm and flexes the elbow; long head weakly flexes the arm.
What nerve innervates the biceps brachii?
The biceps brachii is innervated by the musculocutaneous nerve (C5, C6).
Where does the biceps brachii attach?
Origin: Long head: supraglenoid tubercle of the scapula. Short head: apex of the coracoid process. Insertion: Radial tuberosity and, via the bicipital aponeurosis, the deep forearm fascia.
What is the blood supply of the biceps brachii?
The biceps brachii is supplied by the brachial artery (muscular branches).