Which fibers are dispersed to sweat and oil glands?

The correct answer is the secretory nerve fibers. These fibers are responsible for the stimulation of sweat and oil glands in the skin. When the body needs to cool down or maintain hydration, the secretory nerve fibers activate these glands to produce sweat, which then evaporates from the skin's surface, helping to regulate body temperature.

In addition to sweat glands, these fibers also interact with sebaceous glands, which produce oil to keep the skin lubricated and protected. This action is crucial for maintaining skin health, as the proper function of both types of glands helps to manage moisture levels and barrier function.

Motor nerve fibers, while involved in muscle movement, do not directly influence the activity of sweat and oil glands. Sensory nerve fibers are primarily responsible for transmitting sensations like touch, pain, and temperature from the skin to the central nervous system, rather than regulating glandular function. Corticosteroid fibers are not a well-defined category within the context of nerve fibers associated with glandular activity. Thus, secretory nerve fibers are clearly the most relevant choice in this scenario.