Elbow joint: A hinge type of synovial joint between the forearm and upper arm that allows for the flexion and extension of the forearm.
Flexion:A movement that decreases the angle between two body parts, such as bending the elbow to bring the forearm towards the upper arm.
Biceps brachii: A two-headed muscle located on the upper arm between the shoulder and elbow, known for its role in forearm flexion and supination