Question

In the upper limb, which nerve is associated with cutaneous sensation?

A) Radial nerve
B) Median nerve
C) Ulnar nerve
D) Axillary nerve

Answer 1

The radial nerve is responsible for cutaneous sensation in the upper limb, as it contains sensory fibers originating from the brachial plexus and relaying touch and temperature information to the CNS.

Step-by-step explanation:

In the upper limb, the nerve associated with cutaneous sensation is the radial nerve. The radial nerve is a systemic nerve of the arm that arises from the brachial plexus and contains fibers that serve both sensory and motor functions. Specifically, it has fibers that extend from cutaneous surfaces and send action potentials into the central nervous system (CNS), enabling sensations such as touch and temperature to be felt. It also has motor fibers that cause skeletal muscles to contract within its target regions. Therefore, for questions related to sensation in the upper limb, particularly cutaneous sensation, the radial nerve is often the focus.