Term
Trichology
(trih-kahl-ah-jee) |
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Definition
| * comes from the greek word Trichos (hair) and ology (the study of) |
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Definition
| The part of the hair located below the surface of the scalp |
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Definition
The portion of the hair that projects above the skin
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Term
| Main structures of the hair root? |
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Definition
| Follicle, bulb, papilla, arrector pili muscle, and sebaceous glands. |
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Definition
The tube-like depression or pocket in the skin or scalp that contains the hair root.
* distributed all over the body, except palms and soles.
*follicle extends downward from the epidermis (outer layer of skin) into the dermis (inner layer of skin), where it surrounds the dermal papilla. |
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Definition
minute, involuntary muscle fiber in the skin inserted in the base of the hair follicle.
*fear and cold cause it to contract causing "goosebumps" |
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Definition
oil glands of the skin, connected to the hair follicles.
* secretes Sebum. (oily substance that lubricates skin and hair)
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Term
| Three main layers of the hair shaft: |
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Definition
| Cuticle, cortex and medulla |
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Definition
outermost layer of hair.
*consists of a single, overlapping layer of transparent, scale-like cells that overlap like shingles on a roof.
*hairs primary defense against damage. |
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Definition
| raises the cuticle layer and opens the space between the scales, allowing liqui of penetrate. |
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| Why must Oxidation haircolors, permanent waving solutions, and chemical hair relaxers have an Alkaline PH balance? |
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Definition
| in order to penetrate the cuticle layer and reach their target within the cortex. (swells cuticle, makes space for penetration.) |
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Term
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Definition
Middle layer of the hair.
*fiberous protein core formed by elongated cells containing melanin pigment.
*90%of total weight of hair comes from cortex
*elasticity of hair and its natural color are result of the protein structures located in cortex.
*changes involved in oxidation haircoloring, wet setting, thermal styling, permanent waving, and chemical hair relaxing all take place within the cortex. |
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innermost layer of the hair. (AKA pith of the hair)
*composed of round cells
*common for fine or blonde hair to lack a medulla
*all male beard hair contains medulla. |
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Term
| Hair is composed of protein that grows from cells originating within the? |
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Definition
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Definition
| The process of being Kerantinized; as newly formed cells in the hair mature, they fill up with Keratin, move upward, lose their nucleus, and die; the hair shaft is a nonliving fiber composed of keratinized protein. |
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Term
| Hair is approximately ....% protein |
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Definition
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| The protein in hair is made up of? |
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Definition
| Long chains of amino acids |
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| The amino acids that make up the protein that make up the hair are made up of? |
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Definition
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| The 5 elements that make up human hair are? |
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Definition
| carbon, oxygen, hydrogen, nirtogen and sulfur. (also refered to as COHNS elements) |
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| Hydrogens % in normal hair |
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Definition
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| nitrogens % in normal hair |
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The units of structure in protein.
*linked together end to end.
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Definition
| The chemical bond that joins amino acids to each other |
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Definition
A ong chain of amino acids linked by peptide bonds.
*polypeptide chains intertwine around each other in a spiral shape called a Helix. |
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