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Hair Theory
Pivot Point Trichology
| Question | Answer |
|---|---|
| Trichology | Technical term for the study of hair |
| Hair bulb | The only part of the hair that is alive. |
| hair fiber | The part of the hair that extends beyond the skin. hair shaft. |
| hair strand | The part of the hair that extends beyond the skin. hair fiber |
| hair follicle | The shaft hair grows out of. The size of this determines the diameter of the hair. The shape of this determines if hair is straigh, wavy or cury. |
| basal layer | Cell division takes place. |
| Epicermis | Outermost layer of the skin. |
| Primitive hair germ | The cluster of cells at the basal layer of the epidermis |
| Dermal layer | Underlying or inner layer of the skin. contains connective tissues and a portion the hair follicle. |
| Hair root | Portion of hair that is inside the hair follicle under the skin's surface |
| Papilla | hair structure filled with capillaries that supplies |
| Keratinize | Cells change shape, dry out and form this protein: the cells are no longer alive. |
| Cuticle | overlapping transparent outer covering of the hair shaft. |
| Cortex | The second layer of the hair consisting of protein |
| Medulla | The central core of the hair: sometimes absent in fine hair |
| Sebacceous glands | oil glands |
| Sebum | secretion of fatty oil substance |
| Acid mantle | mixture of sebacceous glands (oil) and sudoriferous glands (sweat) to keep skin and hair soft and supple |
| Arrector pilli muscle | The muscle that couses hair to stand on end when scared or cold |
| anagen | Active or growing stage of hair |
| Catagen | Brief transitional stage of hair cycle in which cell dividion stops |
| Telogen | The resting stage of the hair cycle in which hair has no attached rooth sheat and falls out. |
| Cilia | Eyelash hair |
| melanin | Pigment that give hair and skin its color |
| Melanocytes | pigment producing cells |
| Eumelanin | pigment that gives hair brown or black color. The more present in hair, the darker hair is. |
| Pheomelanin | Pigment that gives hair its red color. |
| Albinism | Lack of produciton of the melanocytes |
| broken hair | results from improper brushing of hair. |
| split ends | brittle hair or trichoptilosis: cracks deep in the cutile into the cortex layer |
| matting | pilica polonica: tangled hair, as in excessive back combing |
| Nodules | Trichorrexis nodosa: knotted haiar with presnce of lumps or swelling alon the shaft: from vigorously rubbing as in towel drying |
| Canities | greying or white hair: loss of pigment as someone ages |
| ringed hair | alternating bands of grey and dark hair |
| hypertrichosis | abnormal coverage of hair on areas of the body usually covered in lanugo hair |
| moniletrix | beads or nodes formed on the hair shaft |
| Psoriasis | thick crusty patches of red irritated scalp |
| Dandruff | pityriasis: chronic scalp condition with excessive flaking |
| pityriasis capitis simplex | dry flakes attached to the scalp or hair |
| pityriasis steatoids | oily flakes combined with sebum |
| Tinea | Ringworm: red circular patches of small bilsters |
| tinea capitis | enlarged open hair follicles surrounded by red or black spots |
| tinea favosa | dry, yellow, encrusted areas on the scalp: shiny pink or odor |
| scabies | itch mites: red and watery: burrows under the skin |
| pediculosis capitis | head lice |
| postpartum alopecia | hair loss occurs after giving birth |
| alopecia areata | loss of hair in round or irregular patches: no obvious skin disorder. |
| telogen effluvium | Premature shedding of hair in the telogen (resting) phase of hair. caused by stress. |
Created by:
annalder
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