A mass of epidermal cells forming a small tube, or canal extending deep into the dermis
Hair follicle
The scientific study of hair and its diseases
Trichology
The ______ gland secretes waxy substances which lubricate the skin and hair
sebaceous gland
Hair root
The three main layers of the hair shaft
Cuticle, cortex, medulla
Waxing
Thick, club shaped structure made from epithelial cells that surround the papilla
Hair bulb
What does the pilosebaecous unit contain?
Hair follicle, Hair root, hair bulb, hair papilla, hair shaft, arrector pili muscle and sebaceous glands
Where does cell mitosis take place?
The matrix
Explain the arrector pili muscle function
Contracts when affected by cold or other stimuli. Causes goosebumps. Causes the hair to stand erect in the follicle
Three stages of hair growth cycle
Anagen, catagen, telogen
During this phase of growth the club hair moves up the follicle and is ready to shed. Final, resting stage.
Telogen
Transition phase of hair growth. Mitosis ceases and the hair detaches from the papilla
Catagen
Growth stage. New hair is produced.
Anagen
Excessive growth of terminal hair in areas of the body that normally grow only vellus hair
Hypertrichosis
Define vellus hair
Peach fuzz. Found in areas that are not covered by coarse hair. Example: cheeks
Excessive hair growth on the face, chest, underarms and groin in women. Caused by excessive male androgen in the blood
Hirsutism
Define the two methods of hair removal categories.
Give examples of each method
Temporary and permanent. Permanent is considered hair reduction
Temporary- waxing, sugaring, threading
Permanent- electrolysis, laser
Define depilation & give examples
A process of removing hair at or near the skin level.
Shaving and chemical depilatories
Define epilation & give examples
The process of removing hair from the bottom of the follicle
Tweeting, waxing, sugaring, threading
Define lanugo hair
Soft downy hair found on a fetus. Sheds after birth
Shortest phase of hair growth
Catagen
The only proven method of permanent hair removal.
Electrolysis
The three main modalities that fall under the classification of electrolysis
Thermolysis, galvanic and blend
Define the two types of Keratin
Soft keratin and hard keratin