Musculus pronator quadratus

The pronator quadratus is a small, square muscle in the forearm, part of the deep flexors. It is the deepest forearm muscle, located beneath the flexor digitorum superficialis. Originating from the ulna, it attaches to the radius, facilitating pronation by rotating the radius medially. The median nerve, specifically its branch, innervates this muscle. The pronator quadratus is crucial for forearm pronation, distinguishing it from other deep flexors responsible for hand and finger flexion.

Explain why the pronator quadratus muscle is difficult to feel.

What nerve is responsible for the innervation of the pronator quadratus muscle?