MICROANATOMY

Detailed explanation-1: -Answer and Explanation: The D. Dermis is not considered an accessory structure in the skin. The dermis is an actual layer of the skin that sits below the epidermis and contains many of the accessory structures in the skin such as hair follicles, hair, sebaceous glands, and sudoriferous sweat glands.

Detailed explanation-2: -The dermis also contains various structures, including hair follicles, glands (sweat and sebaceous glands), touch receptors, nails, a specialized muscle called arrector pili muscle that attaches to hair follicles and raises them up. Collectively, the structures are called skin adnexa or accessory structures.

Detailed explanation-3: -Accessory structures of the skin include hair, nails, sweat glands, and sebaceous glands. These structures embryologically originate from the epidermis and can extend down through the dermis into the hypodermis.

Detailed explanation-4: -Final Answer: Sebaceous glands are not accessory glands.