Skin & Hair Definitions

40 terms by tinalaflamme

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Stratum

a layer of the skin or epidermis

Epidermis

scarf skin--the outer surface of skin visible to the eye

Stratum Corneum

horny layer—flat dead keratonized skin cells that form a protective layer on the surface of the skin.

Stratum Lucidum

clear layer—found only on area of the body where no hair follicles are, such as palms and soles.

Stratum Gransulosum

granual layer where cells are filled with keratohyalin, which helps form keratin. Eleiden is present

Stratum Spinosum

prickle cell layer—cells appear to have little spines on the outside of the membrane.

Keratin

a tough fibrous protein that is part of the other layer of the skin's epidermis, hair, and fingernails.

Dermis

True skin--below the epidermis. Composed mostly of elastin and collagen. Connective tissue foundation of the skin. Many nerve endings, hair follicles, glands are here.

Papillary layer

the upper sublayer of the dermis. Composed of cone like projections responsible for ID markings...finger prints.

Reticular layer

the lower sublayer of the dermis

Collagen

large long chain molecular proteins that lie on the top of the skin and bind water. Also helps to prevent water loss

Elastic Fibril

is intertwine throughout the reticular layer of dermis and give skin firmness and elasticity

Subcutaneous Layer

the fatty layer of the skin found under the dermis..adipose

Sudoriferous Glands

sweat glands

Eccrine Glands

common smaller coiled sweat glands found all over the body. Have their own orifice, duct and fundus. Excrete water and salt like substance. Regulates body temperature

Appocrin Glands

larger coiled sweat glands located in groin and armpits. Produce thicker form of sweat responsible for producing the substance that when in contact with bacteria produces odor

Sebaceous Glands

multi lobed oil glands found in the dermis

Sebum

a semi liquid oil secreted by the sebaceous gland to lub skin. Also acts as an insulator

Melanin

a dark pigment found in the skin and hair. Produces melanocytes (pigment cells)

Arrector Pili Muscle

involuntary muscle attached to the hair follicle at an obtuse angle. Reacts to sensation of cold and fright.

Vellus Hair

soft downy type hair found everywhere on the body

Terminal Hair

deep seated course hairs which grow from the scalp, underarms, pubic region and other parts

Hair follicle

a pore like indentation of the skin from shich the hair grows

Hair Shaft

the portion of the hair above the skin surface

Root

the portion of the hair which lies beneath the skin in the follicle

Dermal Papilla

a separate organ that supplies blood and other element essential for hair growth. Cells make up the Medulla of the hair

Hair bulb

enlarge base of the hair root

Matrix

lower part of the hair bulb where cells begin Mitotic activity. Cells make up the Cortex of the hair

Connective Tissue "sheath"

a continuation of the dermis that surrounds the follicle and sebaceous glands and provides nerve endings and blood supply

Outer Root Sheath

a continuation of the Stratum Malpighii. It surrounds the Inner Root Sheath

Inner Root Sheath

Made up of Cuticle, Huxley, and Henle's Layer. Surrounds the hair as far up as the sebaceous gland ducts

Cuticle Layer of the IRS

Innermost layer of the Inner Root Sheath that Interlocks with the cuticle of the hair

Huxley's layer

middle and thickest layer of the Inner Root Sheath

Henle's layer

Outermost layer of the Inner Root Sheath

Cuticle of the Hair

Outermost layer of the hair that interlocks with the IRS anchoring the hair in the follicle.

Cortex of the hair

Middle layer, Matrix responsible for this layer, elongated cells

Medulla of the hair

innermost center layer of the hair, Dermal Papillae is responsible for this layer

Anagen

active or growing stage

Catagen

Transitional stage--lower half of the follicle degenerates

Telogen

resting stage of growth

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