17 terms

Anatomy 2-Integumentary System

STUDY
PLAY

Terms in this set (...)

Functions
-Protecting the body from damage
-retains water
-protects from abrasion
What is it made up of?
Skin and its appendages
-hair
-scales
-Feathers
-Hooves
-Nails
Skin
The largest organ of the human body; several layers deep
Epidermis
Made up of stratified squamous epithelium; avascular- no blood supply of its own
Stratum Corneum (Outermost)
-15 to 30 cells thick
-Outermost layer
-No nuclei: all dead cells
-Very flat and Compacted
-Lipids between cells
-Keratinized; lipids
Stratum Lucidum (2nd layer)
-Composed of flattened, dead cells
-Nuclei are broken down
-Very thin layer; almost translucent
-precursor and keratin found here
Stratum Granulosum (3rd layer)
-Thin layer
-Cells contain lamellar granules
- Release lipids to cells above
-Give rise to hydrophobic envelope
Stratum Spinosum (4th layer)
-Thickest layer of living keratinocyte cells
- cells are irregular, polygon in shape
-have tiny spine-like extensions
-Cells are switching from mitotic roles to keratin production
Stratum Basale (5th and deepest layer)
-Found closest to dermal blood supply
-Serve as stem cells for epidermis
-Go through mitosis
Melanocytes (Stratum Basale)
-Create melanin- gives skin its color
-Protect DNS from UV rays
Merkel Cells (Stratum Basale)
Touch receptors (Nervous system)
Immune Cells (Stratum Basale)
Help against infection
Basement Membrane
Thin, non-cellular region; separates epidermis from dermis
Dermis
-Made up of connective tissue
-2 layers
-Contains Hair roots, glands, and blood vessels
Hypodermis
-Deepest, lower-most layer
-Anchors skin to fascia
-fat storing and protective
Hair
-Majority of skin is covered in hair
-What do we see?: Terminal endings; the shaft
-Root: Anchored in a tube in the epidermis
Hair Follicle
Surrounds the root, extends into the derrmis