Which type of nerve fibers regulate the secretion of perspiration and sebum?

The correct choice pertains to secretory nerve fibers, which play a vital role in regulating the secretion of perspiration and sebum from the skin's glands. These fibers are part of the autonomic nervous system, specifically involved in controlling the function of glands that are responsible for producing sweat and oil.

Perspiration is primarily controlled by sweat glands, which are stimulated by secretory nerve fibers to release sweat in response to changes in body temperature or during physical activity. Similarly, sebaceous glands, responsible for sebum production that helps moisturize and protect the skin, are also influenced by these secretory fibers.

Understanding the function of secretory nerve fibers is essential for those in the cosmetology field, as it enables them to grasp the underlying physiological processes related to skin care and the regulation of skin secretions.