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Glossary of Anatomy - Epithelial Tissues

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endothelium
(endo = within; -thelium = covering); The layer of simple squamous epithelium that lines the cavities of the heart, blood vessels, and lymphatic vessels. (G-13, 789)
Bowman's capsule
The space between the two layers of the glomerular capsule. (923)
mesothelium
(meso = middle); The type of simple squamous epithelium that lines the epithelial layer of serous membranes. (107)
CILIATED PSEUDOSTRATIFIED COLUMNAR EPITHELIUM
Columnar cells with cilia on the free surface Shorter, unciliated cells are Interspersed between the taller cells. All cells touch the basement membrane, but not all cells reach the free surface. Some of the tall cells are GOBLET CELLS, which secrete mucus. Found lining the lumen of the trachea and bronchi.
SIMPLE CUBOIDAL EPITHELIUM
A single layer of cells roughly cube or pyramidal In shape. May be arranged in sheets as In the liver or In tubes as In the kidney or In spheres as In the acini of the salivary glands and pancreas.
free surface
aka "apical surface"; may be exposed to a body cavity, the lumen of an Internal organ, or the exterior of the body. (106)
KERATINIZED STRATIFIED SQUAMOUS EPITHELIUM
Many layers of cells. The surface cells are dead, flattened and lack nuclei. Deeper cells can be cuboidal or spindle shaped. Found only on the skin.
non-keratinized stratified squamous epithelium
photo here
mesentery
A fold of the peritoneum attaching the small Intestine to the posterior abdominal wall. (G-23, 822)
SIMPLE COLUMNAR EPITHELIUM
A single layer of cells, each taller than wide with central nuclei. Found In the digestive tract from stomach to (but not Including) the rectum.
brush border = microvilli
Microfilaments that provide mechanical support for cell extensions. They are nonmotile, microscopic fingerlike projections of the plasma membrane. Within a microvillus is a core of parallel microfilaments that supports it an attaches to the cytoskeleton. (77-78, 115)
simple squamous epithelium
photo here
TRANSITIONAL EPITHELIUM
Cells at the free surface are either SPHERICAL or BRICK-SHAPED The number of cell layers depends upon the stretch Imposed on It. Cells may contain two nuclei per cell. The cells can slip over each other. Found lining the ureter, urinary bladder and renal pelvis.
glomerulus
A rounded mass of nerves or blood vessels, especially the microscopic tuft of capillaries that is surrounded by the glomerular (Bowman's) capsule of each kidney tubule. (G-16)
cilium
Numerous, short, hair-like projections that extend from the surface of the cell. Each cilium contains a core of microtubules surrounded by plasma membrane. (79)
epithelium
Consists of cells arranged in continuous sheets, in either single or multiple layers. The cells are densely packed, held tightly together by numerous cell junctions, and there is little extracellular space between adjacent plasma membranes. (105)
mucus
The thick fluid secretion of goblet cells, mucous cells, mucous glands, and mucous membranes. (G-25)
lumen
The space within an artery, vein, Intestine, renal tubule, or other tubeline structures. (G-22)
basement membrane
The attachment between the basal surface and the connective tissue in the form of a thin extracellular layer Commonly consists of two layers the basal lamina and reticular lamina. Supports epithelial tissue and serves as a filter in the kidneys and guides cells as they migrate during growth and tissue repair. (106)
acinus
Massive cells in the pancreas that secrete digestive enzymes. (G-2)

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