GENERAL HISTOLOGY

Detailed explanation-1: -The arrector pili muscle (APM) consists of a small band of smooth muscle that connects the hair follicle to the connective tissue of the basement membrane.

Detailed explanation-2: -A small muscle, the arrector pili, is attached to each hair follicle, with the exception of the small follicles that produce only fine vellus hairs. If this muscle contracts, the hair becomes more erect and the follicle is dragged upward. This creates a protuberance on the skin surface, producing…

Detailed explanation-3: -Hair follicles originate in the first and second layers of your skin (epidermis and dermis). Follicles holding your terminal hair, or the hair that grows on your scalp, eyelashes and eyebrows, extend into the first and second layer of your skin and sometimes into the third layer (subcutaneous tissue).

Detailed explanation-4: -Isthmus. The isthmus is the shortened segment of the hair follicle, extending from the attachment of the erector pili muscle (bulge region) into the entrance of the sebaceous gland duct.