What is the function of the ulnar nerve in terms of hand function?

The ulnar nerve plays a crucial role in hand function primarily by innervating the intrinsic muscles of the hand. These intrinsic muscles include the interossei, which are responsible for finger abduction and adduction, as well as the lumbricals, which aid in flexing the fingers at the metacarpophalangeal joints while extending them at the interphalangeal joints. This intricate control over fine motor movements is essential for tasks that require precision, such as gripping or manipulating objects.

The ulnar nerve also contributes to the function of the hypothenar muscles, which control the little finger, enhancing grip strength and dexterity. The overall coordination of these muscle groups allows for complex hand movements, making the ulnar nerve vital for skilled hand function in everyday activities.