Which muscle would be assessed when performing flexion at the humeroulnar and humeroradial joints?

When assessing flexion at the humeroulnar and humeroradial joints, the primary muscle involved is the biceps brachii. This muscle plays a significant role in elbow flexion by contracting to pull the forearm upward toward the shoulder.

While the palmaris longus is involved in wrist movement and may assist slightly in flexion of the hand, it does not have a primary role in flexing the elbow. The triceps brachii is primarily responsible for elbow extension, and the flexor carpi radialis, although it aids in wrist flexion, does not directly contribute to the flexion movement at the elbow joints.

Understanding these muscular functions helps clarify the mechanics involved during actions like elbow flexion.