| A | B |
|---|
| Hair types | Vellus or lanugo, terminal hair |
| Vellus or lanugo | Short, fine, downy hair found on infants or hairless areas |
| Terminal hair | Long hair found on scalp, legs, arms, body |
| Hair root | Hair living beneath the surface of the skin/scalp |
| Hair shaft | The portion of the hair above the skin |
| Follicle | A tube like pocket in skin or scalp containing the hair root and located all over the body, except palms and soles of feet |
| Bulb | Lowest area of strand. |
| Dermal papilla | Small cone shaped area located at teh base of the follicle containing the blood and nerve supply for hair growth |
| Hair root structure | Follicle, bulb, dermal papilla |
| Arrector pili | A tiny involuntary muscle that attaches to the base of the hair follicle that reacts to emotion/cold. Goosebumps |
| Sebaceous gland | The oil gland of the skin connected to the hair follicles that secretes oil call sebum |
| Hair growth patterns | Hair stream, whorl, cowlick |
| Hair stream | Hair that flows in the same direction or two hair streams that flow in the opposite direction from natural part |
| Whorl | Circular pattern |
| Cowlick | Portion of hair that stands straight upward |
| Hair growth cycles-repeats once every 4-5 years | Anlagen, Cartagena, telogen |
| Anagen | The hair growth phase in which new hair is produced. |
| How long does healthy hair grow per month | 1 inch |
| How much hair grows in the anagen phase | 90 percent |
| Catagen | The transitional phase after growth. It shrinks and detaches from dermal papilla. |
| How long does the catagen phase last? | One to two weeks |
| Telogen | Resting phase and final phase of hair cycle |
| How long does telogen last? | 3 to 6 months. Until the fully grown hair sheds |
| What does D.E.P.T.H.S stand for? | Density, Elasticity, porosity, texture and formation, hair history, scalp condition |
| Density | How this or thin hair is. High med and low |
| Elasticity | The amount of stretch and return hair has |
| Elasticity has no stretch | May need to moisture with conditioner and products with carbohydrates |
| Elasticity has no return | Need to deep condition with protein |
| Porosity | The ability to absorb moisture |
| Low porosity | Resistant hair, requires more to raise the cuticle |
| Average porosity | Normal hair |
| High porosity | Overly porous, dry, damaged, brittle, requires a less harsh solution to prevent further damage |
| Types of texture | Coarse, medium, fine |
| Texture | Thickness or diameter of the hair |
| Coarse | Largest diameter and stronger structure |
| Medium | Most common |
| Fine | Smallest diameter, more fragile, prone to damage |
| Formation | Straight, wavy, curly, coily |
| Hair History | What happened chemically and physically to the hair over the past year |
| Scalp condition | How healthy the scalp is |
