Week 3 Terms & Study Flashcards
Trichology
The scientific study of hair and its diseases and care. Greek word trichos
The Hair Root
Part of the hair located below the surface of the epidermis
The Hair Shaft
Portion of hair that projects above the epidermis
Hair Follicle
The tube-like depression or pocket in the skin or scalp that contains the hair root.
Hair bulb
The lowest part of the hair strand
Dermal Papilla
A small, cone-shaped elevation located at the base of the hair follicle that fits into the hair bulb. “The mother of hair” because it contains the blood and nerve supply that provides the nutrients needed for hair growth
Arrector Pili Muscle
The small involuntary muscle in the base of the hair follicle
Sebaceous glands
The oil glands in the skin that are connected to the hair follicles the sebaceous glands secrete a fatty or oily substance called sebum, sebum lubricates the skin.
The hair cuticle
Is the outer most layer of the hair
The cortex
The middle layer of the hair. It is a fibrous proteins core formed by elongated cells containing melanin pigment
The medulla
The inner most layer of the hair and is composed of round cells
Amino Chains
Proteins are made of long chains of amino acids they are units that are joined together end to end like pop beads
Side bonds
3 different types that link polypeptide chains together
Hydrogen hydrogen bond
A weak physical cross-linked side bond that is easily broken by water or heat
A salt bond
Also a weak physical cross-link side bond between adjacent polypeptide chains
A disulfide bond
A strong chemical side bond that is very different from the physical side bond of a hydrogen bond or salt Pond that the sulfide bond joins the sofa or atoms of two neighboring cysteine one third of the hairs overall length
Lanthionine Bonds
Hydroxide chemical hair relaxers break the sulfide bonds and then convert them to Lanthionene bonds
Melanin
Tiny grains of pigment in the cortex that give natural color to the hair
Eumelanin
Provides natural dark brown to black color to the hair and is the dark pigment predominant in black and brunette hair
Pheomelanin
The lighter pigment that provides natural colors ranging from red and ginger to yellow and blonde tones
Wave pattern
The wave pattern of hair refers to the shape of the hair strand it is described as straight wavy curly or extremely curly
Vellus Hair
lanugo hair short, fine, unpigmented, and downy hair that appears on the body.
Terminal hair
The long, course, pigmented hair found on the scalp, legs, arms, and the bodies of males and females.
The Anagen Phase
growth phase
The Catagen Phase
The brief transition. Between the growth and resting phases of a hair follicle
The telogen phase
Also known as resting phase is the final phase in the hair cycle and last until the fully grown hair is shed.
Hair loss
100-150 hairs per day
Hair loss for Women
Abnormal hair loss is not as common in women as it is in men, but it can be very traumatic and devastating for women who experience it.
Alopecia
Abnormal hair loss
Alopecia areata
An auto immune disorder that causes the infected hair follicle’s to be mistakenly attacked by a persons old immune system affects 5 million people in the US
Alopecia Totalis
This hair disorder usually begins with one or more small, round, smooth bald patches on the scalp and can progress to total scalp hair loss.
Postpartum alopecia
Is temporary hair loss experienced at the end of pregnancy
Trichoptilosis
Split ends
Trichorrhexis Nodosa
Knotted hair
Fragilitas
Brittle hair
Pityriasis
Dandruff
Malassezia
Naturally occurring fungus that is present on all human skin but causes the symptoms of dandruff when it grows out of control
Course Hair
Has the largest diameter
Hair texture
The thickness or a diameter of the individual hair strand
Hair density
Measures the number of individual hair strands on one square inch
Hair porosity
The ability of the hair to absorb moisture. The degree of hair porosity is directly related to the condition of the cuticle layer.
Hair elasticity
Is the ability of the hair to stretch and return to its original length without breaking
Hair stream
Hair flowing in the same direction
Whorl
When hair leaves follicles at an angle on the head
