Which of the following is the innermost layer of the hair follicle?

• A. Cuticle
• B. Sebaceous gland
• C. Medulla
• D. Cortex

Answer: (C)

Verified step by step guidance

1. Understand the structure of the hair follicle: The hair follicle is composed of multiple layers, including the medulla, cortex, and cuticle. These layers are organized from the innermost to the outermost part of the hair shaft.
2. Define the medulla: The medulla is the innermost layer of the hair shaft. It is composed of loosely packed cells and air spaces, and it is present in thicker hairs but may be absent in finer hairs.
3. Define the cortex: The cortex is the middle layer of the hair shaft. It contains keratin and melanin, which provide strength, elasticity, and color to the hair.
4. Define the cuticle: The cuticle is the outermost layer of the hair shaft. It consists of overlapping cells that protect the inner layers and contribute to the hair's shine and smoothness.
5. Clarify the sebaceous gland: The sebaceous gland is not part of the hair shaft itself but is associated with the hair follicle. It secretes sebum, an oily substance that lubricates the hair and skin.