Which nerve fibers primarily carry sensory impulses?

Afferent fibers are responsible for transmitting sensory impulses from sensory receptors to the central nervous system (CNS). These fibers carry information about various stimuli, such as touch, temperature, pain, and proprioception, to the brain, where the sensory information is processed.

In contrast, efferent fibers carry motor impulses from the CNS to muscles and glands, facilitating responses and actions like movement and secretion. Sympathetic and parasympathetic fibers are components of the autonomic nervous system, which controls involuntary bodily functions. While they influence the body's responses to stress and relaxation, respectively, they do not primarily transmit sensory information. Thus, when considering the function of nerve fibers in the context of sensory impulses, afferent fibers are the correct choice.