The biceps brachii muscle does the following:
- Flexes the arm at the elbow.This means that the biceps brachii muscle bends the arm at the elbow joint such that there is a decrease in the angle between the forearm and the upper arm.
- Supinates the forearm.This means that the biceps brachii muscle rotates the forearm outward (i.e. if your arms are hanging by your sides it is the action of turning your palms forward, or if you forearms are held horizontally it is the action of turning your palms upward).
The muscular anatomy image shown here is in the public domain. It may have been modified by ShapeSense.com, but was originally acquired at the following address:http://en.wikipedia.org/wiki/File:Arm_muscles_front_superficial.png