Which of the following is NOT part of the pilosebaceous unit?

• A. Arrector Pili Muscle
• B. Sudoriferous gland
• C. Hair Follicle
• D. Sebaceous Gland

Answer: (B)

The pilosebaceous unit consists of a hair follicle with the hair shaft, the sebaceous gland that oils the follicle and hair, and the arrector pili muscle that attaches to the follicle and causes hair to stand up. Sweat glands (sudoriferous glands) are separate skin glands that produce sweat for cooling and do not form part of this unit. Even though some sweat glands in certain areas (like apocrine glands) are located near hair follicles, they are not considered integral components of the pilosebaceous unit. Therefore, the sudoriferous gland is not part of the pilosebaceous unit.