What is the primary role of the ulnar nerve?

The primary role of the ulnar nerve is to innervate the muscles of the hand, particularly those responsible for fine motor movements. It plays a crucial role in the function of intrinsic hand muscles, including the hypothenar muscles (which control the little finger), as well as the adductor pollicis and some lumbrical muscles. This nerve allows for actions such as gripping and manipulating objects with precision.

Understanding the ulnar nerve's function highlights its importance in hand coordination and dexterity, particularly in activities that require the use of the little finger and the ring finger. Its injury can result in significant impairments, such as decreased grip strength and coordination, often referred to as "claw hand" when it affects the intrinsic muscles of the hand, which further emphasizes its primary role in hand movement and functionality.