College of Massage Therapists of British Columbia (CMTBC) Practice Exam

Which sensory area is associated with the ulnar nerve?

1. Lateral hand

2. Medial hand

3. Posterior upper limb

4. Anterior arm

The correct answer is: Medial hand

The ulnar nerve is primarily responsible for the sensory innervation of the skin on the medial side of the hand. This includes the little finger and half of the ring finger, along with the corresponding portion of the palm. The ulnar nerve also supplies sensation to the medial aspect of the hand in this region. Understanding the pathway and function of the ulnar nerve is important for recognizing its role in tactile sensation, particularly in contrast to other nerves that innervate different areas of the hand. In examining the other choices, the lateral hand is primarily innervated by the median nerve, whereas the posterior upper limb and anterior arm do not have direct sensory associations with the ulnar nerve. The median nerve and radial nerve serve those respective areas, distinguishing them from the sensory territory of the ulnar nerve. Thus, the correct association of the ulnar nerve with the medial hand provides a clear understanding of its role in the sensory system.