Biceps brachii and triceps brachii muscles of human body are associated with

The biceps brachii (front of upper arm) and triceps brachii (back of upper arm) are muscles that cross the elbow joint. Biceps brachii flexes the forearm (bends the elbow), while triceps brachii extends the forearm (straightens the elbow). These muscles insert on the radius and ulna bones of the forearm, making them responsible for all forearm movements rather than thigh or shoulder movements.