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Membranes and type of Skins Heidi Martinez Period 1 (Epithelial Membrane…
Membranes and type of Skins
Heidi Martinez
Period 1
Layers of skins
Epidermis (outer layer)
-keratinized stratified squamous epithelium
-avascular (without blood vessels)
-oxygen/nutrients diffuse from derism
Dermis (inner layer)
-dense fibrous ct
-thicker
-elastic fibers
Hypodermis (under lining leyer)
-its the subcutaneous
-adipose tissue
-amchors skin to the underlining structure
Epithelial Membrane
Cutaneous membrane
-skin
-protect the rest of the body's tissues and organs from physical damage
Serous membrane
-membrane that lines body cavities and
covers organ surface
-double membrane layers
Muscus Membrane
-covers the surface of internal organs
-lines various cavities in the body
-consists of one or more layers of epithelial cells overlying a layer of loose connective tissue.
Dermis : connective tissue and strong / flexible
Papillary layer
-thin superficial layer
-loose connective tissue
-protects that protrude into epidermis
Reticular layer
-dense connective tissue
-matrix contains thick bundle
of collagen fibers
-highly vasular lots of blood vessels
Cutaneous gland-
-broken-down cell that are replaced by mitosis at the base of the gland
Sudoriferous gland-
discharge sweat by tiny openings
in the surface of the skin.
Eccrine gland-
secrete water to the skin surface,
where it cools the body by evaporation.
Apocrine gland-
Bacteria eats organic molecules
In the sweat and causes body odor.
Cerumionous gland-
To deter insects and blocks entry of
foreign material
Sebaceous gland- it's all over the body except on
Palms and sole of feet
Nail plate- hard part of the nail
Free edge- overhangs the tip of the nail
Nail body- visible, attached part of the nail
Nail root - umder the overhanging skin
Nail bed- skin under the plate
Nail matrix- growth zone
Luncle- white crescent proximal end of the nail
Basal cell carcinoma:
least maignani but most common skin cancer.
stratum basal but proliferate / invalue the dermis and hypodermis.
Squamous cell carcinoma:
-second most common skin cancer
arise from keratinocytes of the stratum
spinosum
grow/ meta stasized to lymph nodes quickly
-
Malignant melanoma:
most deadly skin cancer
highly metastatic/ resistant to chemotherapy
-cancer of metanocytes
Melanin:
-ranges from dark brown to yellow
-pigment protects deeper organs from the UV radiation found in sunlight
-freckle / moles local concentration of melanin
Cartene:
yellow/ orange pigment
cartene can be converted to vitamin A inthe liver
essential for normal vision / protection of epithelial tissue
Hemoglobin:
-Dark red molecules in red blood cell
Layers of dermis
Glands
Nails
Types of skin cancer
3 pigments