Hair Structure

The study of hair is called ________________.

• Dermatology

• Endocrinology

• Trichology

• Technology

Full-grown human hair is divided into two principle parts, which are the hair __________ and the hair ________.

• Root and cuticle

• dermal papilla and follicle

• cuticle and medulla

• root and shaft

The thickened, club-like structure that forms the lower part of the hair root is known as the _________.

• cuticle

• hair bulb

• dermal papilla

• medulla

The small, involuntary muscle attached to the underside of the hair follicle is called the _______.

• dermal papilla

• arrector pili

• cortex

• medulla

Oil glands, which consist of a sac-like structure in the dermis, are also called __________.

• trichology

• melanin

• sebaceous glands

• arrector pili

An oily substance secreted from the sebaceous glands which keeps the skin surface soft and supple is ___________.

• salt

• emollients

• melanin

• sebum

The outermost layer of the hair is called ________.

• cuticle

• cortex

• medulla

• melanin

The _______ is the portion of the hair that is located below the surface of the skin or scalp.

• hair shaft

• hair root

• medulla

• cortex

The innermost layer of the hair which may be missing in fine hair is _________.

• cortex

• cuticle

• sebum

• medulla

The layer that contains melanin and gives strength and elasticity to the hair is ____________.

• cortex

• salt bonds

• cuticle

• medulla