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Epithelial Tissue

3.4--Epithelial Tissue

TermDefinition
EPITHELIAL TISSUE Consists of cells arranged in continuous sheets; either single or multiple tightly packed layers. Little to no matrix, no blood vessels (avascular)
3 FUNCTIONS OF EPITHELIAL TISSUE (1) SERVE AS BARRIERS TO LIMIT TRANSFER IN AND OUT OF BODY (2)RELEASE PRODUCTS BY CELLS ONTO FREE SURFACES (3)PROTECT AGAINST ENVIRON.
APICAL (FREE) SURFACE FACES BODY SURFACE, BODY CAVITY, LUMEN, OR DUCT.
LATERAL SURFACES FACE ADJACENT CELLS
BASAL SURFACE DEEPEST LAYER; ADHERES TO BASEMENT MEMBRANE
BASEMENT MEMBRANE "ANCHOR" MEMBRANE. CONSISTS OF PROTEINS SECRETED FROM THE EPITHELIAL CELLS WHICH MAKE UP THE BASAL LAMINA AND RETICULAR LAMINA. RESTRICT PASSAGE, SURFACE FOR GROWTH, ALSO BLOOD FILTRATION
BASAL LAMINA THIN LAYER, CONTAINS COLLAGEN AND LAMININ ON TOP OF RETICULAR LAMINA
RETICULAR LAMINA CLOSER TO CONNECTIVE TISSUE; CONNTAINS PROTEINS MOSTLY FROM CONNECTIVE TISSUE (COLLAGEN)
GLANDULAR EPITHELIUM MAKES UP SECRETING PART OF GLANDS
SIMPLE EPITHELIUM SINGLE LAYER OF CELLS -- FUNCTIONS IN OSMOSIS, FILTRATION, SECRETION, OR ABSORPTION
STRATIFIED EPITHELIUM MULTIPLE LAYER OF CELLS -- MULTIPLE LAYERS
PSEUDOSTRATIFIED EPITHELIUM APPEARS TO HAVE MULTIPLE LAYERS, BUT ALL CELLS TOUCH THE BASEMENT MEMBRANE. IF CILIATED MAY CONTAIN GOBLET CELLS. IF NOT, THEY DON'T
SQUAMOUS CELLS THIN, ALLOW FOR RAPID PASSAGE OF SUBSTANCE THROUGH THEM; STACKED AT TOP
CUBOIDAL CELLS AS TALL AS WIDE; MAY HAVE MICROVILLI AND FUNCTION AS SECRETION OR ABSORPTION
COLUMNAR CELLS MUCH TALLER THAN WIDE. PROTECT UNDERLYING TISSUE. MAY HAVE CILIA OR MICROVILLI; SECRETION AND ABSORPTION
TRANSITIONAL CELLS CHANGE SHAPE FROM SQUAMOUS TO CUBOIDAL AND BACK (INT. = COLUMNAR). NEEDED FOR ORGANS THAT COLLAPSE AND STRETCH (URINARY BLADDER)
GOBLET CELLS MODIFIED COLUMNAR CELLS THAT SECRETE MUCUS AT APICAL SURFACE
KERATIN TOUGH FIBROUS PROTEIN THAT RESULTS FROM DEAD SQUAMOUS EPITHELIAL CELLS THAT BECOME SEPARATED FROM BLOOD SUPPLY
KERATINIZED STRATIFIED SQUAMOUS HAS NO NUCLEI, OCCURS NEAR APICAL SURFACE. NO CILIA
UNICELLULAR GLANDS SINGLE CELLED GLANDS (GOBLET CELLS ARE EX.)
MULTICELLULAR GLANDS MOST EXOCRINE GLANDS
FUNCTIONAL CLASS--MEROCRINE GLANDS EXOCYTOSIS SECRETION
FUNCTIONAL CLASS--APOCRINE GLANDS ACCUMULATE SECRETORY PRODUCT AND PINCH OFF
FUNCTIONAL CLASS--HOLOCRINE GLANDS ACCUMULATE PRODUCT IN CYTOSOL; MATURE CELL RUPTURES, AND SECRETES
Created by: 100000434525601
 

 



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