Intergumentary System

Function of the skin

regulates temperature, serves as a blood reservoir, protection, excretion and absorption, synthesis of vitamin D.

Epidermis

The outer layer of the skin

stratified squamous epithelium

Protects underlying tissue in areas subjected to abrasion. Mouth Vagina

Keratinocyte

Keratin cells the most abundent ,To produce keratin fibrils

Keratin

Is a fibrous protein that gives the epidermis its durability and protective capability.

Melanocyte

Spidery black cells that produce the brown to black pigment melanin.

Melanin

Provides a protective pigment umbrella over the nuclei of the cells in the deep epidermal layers.

Stratum corneum

Most superficial layer 20-30 layers of dead cells

Stratum granulosum

One to five layers of flattend cells. Releases lipids

Stratum spinosum

Several layers of keratinocytes joined by desmosomes. Thick bundles of intermidate filaments made of pre-keratin

Stratum basale

Deepest epidermal layer

Dermise

The dense irregular connective tissue,

Papillary layer

The most superficial dermal region composed of aerolar connective tissue.

Reticular layer

The deepest skin layer.Dense irregular connective tissue

Dense irregular connective tissue

Provides structural strength.Joints

Subcutaneous layer (hypodermis)

beneath dermis

Adipose Tissue

Tissue that stores fat.

Dermal blood supply

Temperature regulation

Origin of accessory structures

Nail

Nail Body

Nail bed

Lunule

an opaque white crescent at proximal end of nail

hair follicle

Hair root

Hair Shaft

Arrector pili

sebaceous gland

Eccrine sweat gland

Apocrine gland