MarkeciaBogard20 (Components of the Integumentary System (consist of skin…
Components of the Integumentary System (consist of skin and its appendages.
Composed of 4 types of cells keratinocytes, melanocytes, tactile epithelial cells and dendritic cells.
.Well supplied with blood vessels and nerves. 20% of Papillary layer and 80% of Reticular layer
The part that is superficial to the skin.
Hypodermis or Superficial fascia:
underlies the skin, primarly composed of adipose tissue.
Sensory nerve,Lamellar corpuscle, Hair follice receptor
Appendages of skin:
Eccrine sweat gland, arrector pili muscle, sebaceous gland, hair root, hair follicle
Arrector pili muscle is a smooth muscle that relax and erect the hair. (muscle that controls hair raising when a person gets goosebumps.
Hair follicles extend from the epidermal surface into the dermis.
Hair root is embedded into the skin within follice.
Sweat glands helps to prevent the body from overheating.
Apocrine sweat glands
Apocrine secretion allows the cells to secrete a portion of the apical cells that includes proteins and lipids.
Function is odor producing. Bacteria decomposes the proteins and lipids to create the odor.
Located in axillary region, anal and genital areas.
Exocrine sweat glannds:
Function is evaporative cooling
Located nearly everywhere
Mercocrine secretion allows the cell to just realease the product such as watery sweat and some salts.
Function is to produce an oil and collect dirt
Located everywhere except palms of hands and soles of feet. Also associated with hair
Subpapillary vaascular plexus
Dermal vascular plexus
A knot of capillaries that deliver sunstances that will stimulate and supply nutrients to grow hair.
Function: Protects fingertips and toe tips
Structure: Dead cells filled with keratin
General Function of Integumentary System and Hypodermis
Production of vitamin D:
Use UV radiation to synthesize vitamin D. Vitamin D is need for absorbing calcium.
Associated with the nerve endings. These receptors keep us aware of conditions on the body surface, Such as, touch, pressure,tempertaure and pain.
: Sweat glands and blood vessels help keep thermal regulation throughout the body
Helps to excrete urea, salts and water through sweat
from external harm, including UV radiation
: Mostly adipose tissue. Usage of Nutrients storage, insulation, and cushioning
Layers of the Epidermis and special features and functions.
Special contact epithelial cells called tight junctions are present.
1 to 5 layers of flattened keratinocyers cells are present
Helps prevent loss of water
Th spines of the desmosomes hang onto each other.
Thick and protective
Only in located thick skins such as palms and soles of feet.
Some keratinocytes are present.
10% - 25% of cells are melanocytes
Mostly stem cells present
Basal Layer of cells/ Deepest layer of epidermid
Mostly stem cells present
Glycolipids in extracelluar matrix
Several layer of dead keratinocytes
Superficial layer of epidermis
Cell types located in Epidermis
Known to take a pathogen to the lymph nodes to eventually get destroy it.
Tactile epithelial cells (Merkel cells):
Receptor cells that are sensitive to touch.
Create the pigment melanin and helps protects against harmful UV radiation
Creates more keratinocytes.
: Contains tough fibrous protein called keratin and connect together with special contacts called desmosomes.