Chapter 11: Properties of the Hair and Scalp (pt. 1)

(a)   is the scientific study of hair and its diseases and care.

(a)   means, "the study of".

A mature strand of human hair is divided into two parts:

(a)  

Part of the hair strand located below the surface of the epidermis.

• hair shaft

• hair root

Part of the hair strand that projects above the dermis.

• hair shaft

• hair root

Small, cone-shaped elevation located at the base of the hair follicle that fits into the hair bulb.

• hair follicle

• hair bulb

• dermal papilla

• arrector pili muscle

• sebaceous gland

The tube-like depression or pocket in the skin or scalp that contains the hair root.

• hair follicle

• hair bulb

• dermal papilla

• arrector pili muscle

• sebaceous glands

Small, involuntary muscle in the base of the hair follicle.

• hair follicle

• hair bulb

• dermal papilla

• arrector pili muscle

• sebaceous glands

The oil glands in the skin that are connected to the hair follicles.

• hair follicle

• hair bulb

• dermal papilla

• arrector pili muscle

• sebaceous glands

The thickened, club-shaped structure that forms the lower part of the root.

• hair follicle

• hair bulb

• dermal papilla

• arrector pili muscle

• sebaceous glands