Integumentary System Flashcards
Organ covering the external surface of the body
Skin
Major Tissue Layer of Skin
Epidermis
Dermis
Most superficial layer of skin
Layer of epithelial Tissue
Epidermis
prevents water loss and resist abrasion
Epidermis
thickness of epidermis and dermis varies, rests on the
Dermis
consists primarily of cell known as ____ which synthesize ____
Epidermis
Keratinocytes
Keratin
Cell change shape and chemical composition
Keratinization
Layer of dense connective tissue depending on the location
Dermis
On average, the dermis is __ to __ than epidermis
10 to 20 times thicker
responsible for most of the skin’s structural strength
Dermis
Where the skin rests which is also a layer of connective tissue
Subcotaneous Tissue
Deepest layer of epidermis
Consists cell undergoing cell division
Stratum basale
consists of cuboidal or
columnar cells that undergo
mitotic divisions about every
19 days
Stratum basale
consists of lipid-filled
vesicles called lamellar
bodies.
Stratum spinusom
composed of flat,
diamond-shaped cells that
accumulate more keratin and
release contents of lamellar
bodies to the extracellular
space.
stratum granulosum
thin clear zone between the
stratum granulosum and
stratum corneum
stratum lucidum
most superficial stratum of the epidermis
consists of dead squamous cells filled with keratin
Keratin gives the stratum its structural
strength.
cells are also coated and
surrounded by lipids, which
help prevent fluid loss
through the skin.
Stratum corneum
Excessive sloughing of stratum corneum cells from the surface of the scalp
Dandruff
Over a bony prominence, the stratum corneum can thicken to form a cone-shaped structure
corn
skin subjected to friction, the number of layers in the stratum corneum greatly increases, producing a thickened area
Callus (Hard Skin)
composed of dense collagenous connective tissue containing fibroblasts, adipocytes, and macrophages
Nerves, hair follicles, smooth muscles, glands, and lymphatic vessels extend into the dermis.
Dermis
Layer of Dermis
Papillary Layer
Reticular Layer
