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20 Cards in this Set

  • Front
  • Back
Functions of Skin
1. protection
2. Temperature Regulation
a. sweating
b. blood flow
3. Sense Organ
4. Excretion
5. Vitamin D synthesis-associated with Ca metabolism
Pigmentation

-Melanin
Black pigment - non in albinos
Pigmentation

-Carotene
Yellow to orange tint
Pigmentation

-Hemoglobin
Found in red blood cells
Skin Layers

-Epidermis
-Stratified Squamous Epithelium
-Avascular - without blood vessels
Skin Layers

-Dermis
Dense Irregular Connective Tissue
Skin Layers

-Hypodermis
-Also known as subcutaneus layer
-Loose adipose tissue
Epidermis

A.Stratum Germinativum - Deepest Layer
* Mitosis goes on in this layer
* Columnar to cuboidal in shape
* Some cells have melanin from melonocytes - protects from UV damage
Epidermis

-Stratum Granulosum - 2nd layer
* Granules in the cytoplasm
* Cells in this layer are beginning to denucleate, getting flatter, accumulating protein and dying
Epidermis


-Stratum Lucidum
* Lucidum=clear
* Keratin precursor is making it clear
* mostly flat, most are dead and w/o nucleus
Epidermis


-Stratum Corneum - outer most layer
* Hard due to keratin - fibrous protein
* cells are flat, dead, keratin filled flakes
Dermis


-Papillary Layer
* Made up of dermal papilla(e), finger like projections help with adhesion btw dermis and epidermis
* Also helps with diffusion btw layers
Dermis

-Reticular Layer - net like layer
* Dense irregular connective tissue
* Mostly collagen fibers
* Changing patern of lines in this layer is called Langer's lines
Contents of Dermis
1. Blood Vessels
2. Sweat Glands
3. Lymph Vessels
4. Hair Follicles
5. Nerves
Glands


-Sudoriferous Glands
a. eccrine - in most places of the body, made of primarily water & salt
Glands


-Apocrine glands
* apocrene secretion
* part of cell is lost with secretion
* bacteria feeds of parts brokendown cell and waste creates smell
* found in arm put or around genitals and anus
Glands


-Sebaceous Glands
* holocrine mode of secretion - whole cell lost with secretion
* created sebum -> oil rich
Glands

Others - Specialized
a. Ceruminous glands - wax

b. Lacrimal glands - tears

c. mammary glands - milk
Accessory Structure


-Nails (only in primates)
* Nail plate - derived from stratum corneum & lucidum

* Nail matrix - nail bed

* Lunula - where mitosis occurs that results in growth of nail
accessory Structures


-Hairs (pili)
* Hair shaft
* Errector pili - smooth muscle
* hair folicle
* sebaceous gland
* hair papilla - has blood vessels that givenutition to the cells at the root