skin structure

SKIN STRUCTURE

Ms. SmithSkin Care

Introduction

Skin Facts Skin care is a multi-billion dollar

business. Skin is the largest organ of the

human body. (Average adult’s skin = 8 pounds and covers 22 square feet.)

The skin has many important functions.

We lose about 50 million skin cells a day!

Objectives

Objectives List the functions of the skin. Describe the structure and composition of

the skin. Define important terms relating to the skin.

Assessments Written – Test on Friday Practical – Facial exchange on Thursday

Word List

Dermatology Dermatologist Esthetician Dermis Epidermis Stratum Layers (5) Adipose Tissue Reticular Layer Body Temperature Papillary Layer Subcutaneous tissue

Sweat gland Sebaceous gland Sebum Follicle Collagen and Elastin Fibers

Dermatology

The study of skin Dermatologist vs.

Esthetician

Functions of Skin

Protection Sensation Heat regulation Excretion Secretion Absorption

Three Main Layers

Epidermis Dermis Subcutaneous

Subcutaneous

Fatty layer, also called adipose Bottom most layer of the skin Varies in thickness Gives smoothness and contour to the

body Energy source Protective cushion for the outer skin

Dermis

Above subcutaneous layer Sensitive layer of connective tissue that contains:

Blood vessels Lymph vessels Nerves Sudoriferous glands - sweat Sebaceous glands - oil Hair follicles Arrector pili muscles papillae

Two layers Reticular layer(deeper layer) Papillary layer (dermal papillae, tactile corpuscles, melanin)

Collagen fibers and elastin Allow skin to stretch and contract as necessary Weakened fibers = wrinkles, sagging, cellulite

Epidermis

Outermost layer (also called cuticle) No blood vessels Small nerve endings 5 layers

Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale

Structure of the Skin

Questions/Discussions

What gives skin its color? What gives skin its strength,

form, and flexibility? Name the 3 main layers of the

skin. Name the 5 layers of the

epidermis from top to bottom.