Chapter 18 Hair Removal Flashcards
The scientific study of hair and its diseases
Trichology
Extremely soft and downy hair on a fetus
Lanugo
Short, fine, unpigmented downy hair that appears on the body, with the exception of the palms of the hands and the soles of the feet
Vellus hair
Longer, coarser hair found on the head, brows, lashes, genitals, arms, and legs
Terminal hair
A mass of epidermal cells forming a small tube, or canal; extend deep into the dermis
Hair follicle
Anchors hair to the skin cells and is part of the hair located at the bottom of the follicle below the surface of the skin
Hair root
Part of the hair located above the surface of the skin, consisting of the outer layer (cuticle), inner layer (medulla), and middle layer (cortex)
Hair shaft
Hair unit that contains the hair follicle and appendages; hair root, hair bulb, dermal papilla, sebaceous appendage, and arrector pili muscle
Pilosebaceous unit
Swelling at the base of the follicle that provides the hair with nourishment; it is a thick, club shaped, structure that forms the lower part of the hair root
Hair bulb
Cone shaped elevations at the base of the follicle that fit into the hair bulb. These are filled with tissue that contains the blood vessels and cells necessary for hair growth and follicle nourishment
Hair papilla
First stage of hair growth, during which new hair is produced
Anagen
Transition phase of hair growth; the hair shaft grows upward and erect and detaches from the hair bulb
Catagen
The final stage in the hair cycle that lasts until the fully grown hair is shed; also known as the resting phase
Telogen
Growth of an unusual amount of hair on parts of the body normally only bearing downy hair, such as the face, arms, and legs of women or the backs of men
Hirsutism
Condition of abnormal growth of hair characterized by the growth of terminal hair on areas of the body that normally only grow vellus hair
Hypertrichosis