Anatomy 125 Megee Layers of the Skin

hair shaft

epidermis

papillary layer

reticular layer

dermis

hypodermis (superficial fascia)

sensory nerve fiber

pacinian corpuscle

hair follicle receptor (root hair plexus)

letter J

dermal papillae

subpapillary vascular plexus

pore

eccrine sweat gland

arrector pili muscle

sebaceous (oil) gland

hair follicle

hair root

cutaneous vascular plexus

adipose tissue

located on the bottom of the dermis

stratum basale (basal layer)

-Deepest epidermal layer firmly attached to the dermis

single row of cell stems above the basement membrane

stratum spinosum (prickly layer)

Many layers of keratinocytes attached by desomomes

stratum granulosum (granular layer)

-thin; three to five cell layers in which cells flatten

-keratohyaline and lamellated granules accumulate

stratum lucidum (clear layer)

Thin layer, of cells superficial to the stratum granulosum

stratum corneum (horny layer)

-20-30 rows of dead, flat, keratinized membranous sacs

Melanocytes

Stratum basale, produces melanin

Thick skin

Contains 5 layers; soles of feet, palms of hands,

Thin skin

Covers most of the body, hair follicles, sebaceous glands and sweat glands

integument functions

Protection, barrier, preventing water gain/loss, regulation temperature, aiding metabolism,

kertain

tough water-repellent protein found in the epidermal cells

subcutaneous layer

connective and adipose tissue layer just under the dermis

arrector pili

tiny muscle that attaches to the hair follicle

tactile cells (merkel cells)

touch sensations

Come, Let's Get Sun Burned

Corneum,

Lucidum,

Granulosum,

Spinosum,

Basale