Term
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Definition
| The cellular covering of internal and external surfaces of the body. Consists of cells joined by small amounts of cementing substances. |
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Term
| Simple Squamous Epithelium |
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Definition
| Epithelium composed of a single layer of plate- or scalelike cells best suited for the transportation of substances across the cytoplasm |
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Term
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Definition
| The layer of flat cells derived from the mesoderm, that line the body cavity of the embryo. In Adults, it forms the simple squamous epithelium that covers the surface of all true serous membranes (peritoneum, pericardium, and pleura) |
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Definition
| The layer of epithelium cells that lines the cavities of the heart and the blood and lymph vessels. Sometimes applied to other internal epithelial surfaces. |
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Term
| simple cuboidal epithelium |
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Definition
| Epithelium composed of a single layer of cells that are generally cube shaped. Usually associated with secretion and/or absorption |
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Term
| simple columnar epithelium |
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Definition
| Single layered epithelium in which the height of individual cells easily exceed their width. Usually associated with secretion and absorption. Often possess a variety of cell modifications (microvilli, cilia, glycocalyx, etc.) |
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Term
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Definition
| : Slender, cylindrical, cytoplasmic processes from the free surface of a cell. They function to increase surface area for absorption |
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Term
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Definition
| Being an epithelium consisting of closely packed cells which appear to be arranged in layers but all of which are attached to the basement membrane |
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Term
| Stratified squamous epithelium |
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Definition
| The most common of the multilayered epithelia, covering most of the external body parts which functions to protect underlying tissue from dessication. |
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Term
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Definition
| Being converted into keratin (fibrous proteins forming horny epidermal tissue) |
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Term
| Stratified cuboidal/columnar epithelium |
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Definition
| Bilayered epithelium where one layer always touches the basement membrane, while the other always doesn’t |
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Term
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Definition
| Multilayered epithelium found only in the urogenital system capable of changing its shape between stratified squamous and stratified cuboidal epithelium |
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Term
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Definition
| The delicate extracellular supporting layer of mucopolysaccharides and protein underlying all epithelia. |
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Term
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Definition
| The cell layer of the basement membrane which lies next to the cell membrane of the basal epithelial cell and is made solely by the overlying epithelial cell |
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Term
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Definition
| Cell layer of the basement membrane that consists of small irregular bundles of small collagen fibrils with a layer of ground substance. Made by both epithelium and surrounding tissue |
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Term
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Definition
| Structures which provide points of adhesion to anchor cytoskeletal elements to basal cell membranes. Often randomly placed along the lateral sides of the epithelial cell |
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Term
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Definition
| Structure within tissue of a multicellular organism. Abundant epithelial cells, and consist of protein complexes, which function to provide contact between neighboring cells, or the cell and extracellular matrix |
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Term
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Definition
| tight junction” a cell junction that forms a morphological barrier between the intercellular spaces of adjacent cells. Part of the junctional complex of columnar epithelium |
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Term
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Definition
| “Zonula Adherens” Cell junction that functions to bind adjacent epithelial cells. Occurs as a band or zone that encompasses the entire apical perimeter of the cell in columnar or cuboidal epithelia. |
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Term
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Definition
| spot welds” that provide one of the structural units that bind epithelial cells together. Half units are called hemidesmosomes |
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Term
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Definition
| An attachment point between epithelial cells, typically composed to three components, the Zonula Occludens (Tight junctions), the Zonula Adherens , and Macula Adherens (Desmosomes). |
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Term
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Definition
| “Nexus” - Specialized platelike junctions that mediate the flow of current from one cell to another. Located on the deeper lateral surfaces of apposing cells. Typically hundreds if not thousands connect one cell to another |
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Term
| Cell Surface Specializations |
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Definition
| Modifications or specializations of the free or luminal surfaces of epithelial cells found among the different forms of epithelia |
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Term
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Definition
| Specialization of the free surface of a cell, consisting of minute cylindrical processes (microvilli) that increase surface area |
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Term
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Definition
| Glycoprotein surface coat that covers the entire cell and is prominent in intestinal cells with microvilli. |
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Term
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Definition
| Very long microvilli that line the luminal surface of certain columnar cells. Non-motile and possessing actin cores |
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Term
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Definition
| cell processes possessing an internal microtubular substructure designed for contractility. Move substances such as mucous by means of metachronal rhythm |
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Term
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Definition
| An aggregation of cells specialized to secrete or excrete materials not related to their ordinary metabolic needs |
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Term
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Definition
| An aggregation of cells specialized to secrete or excrete materials not related to their ordinary metabolic needs |
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Term
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Definition
| ductless glands that discharge their secretions(hormones) directly into the blood |
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Term
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Definition
| which discharge through ducts into luminal or free space |
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Term
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Definition
| Solitary mucus secreting cell primarily of the intestinal and respiratory epithelium. |
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Term
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Definition
| Glands which occur as sheets of epithelial cells with secretory functions |
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Term
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Definition
| Cluster of secretory cells (adenomeres) that connect to the surface by unbranched ducts |
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Term
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Definition
| straight configuration of simple glands with a tubular endpiece (adenomere |
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Term
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Definition
| coiled configuration of simple glands |
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Term
| Cuplike (acinus and alveolus) |
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Definition
| rounded configuration of adenomere |
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Term
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Definition
| Glands in which adenomeres empty into more than one duct. Can all be same type or mixed (tubular, or tubuloalveolar |
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Term
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Definition
| tubular configuration of gland with branched adenomere configuration |
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Term
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Definition
| Alveolar (acinar) configuration of gland with branched adenomere configuration |
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Term
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Definition
| mixed configuartion of compound gland including both tubular and alveolar adenomeres |
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Term
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Definition
| the basic unit of secretion in the gland |
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Term
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Definition
| round configuration of the adenomere |
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Term
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Definition
| round configuration of the adenomere ( same as acinus |
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Term
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Definition
| the blind terminal portion of the gland which is the functional portion of the organ the endpiece |
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Term
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Definition
| a passage with well defined walls for the passage of excretions or secretions |
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Term
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Definition
| a more or less well defined portion of an organ or gland |
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Term
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Definition
| a small segment of lobe, especially one of the smaller divisions making up the lobe |
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Term
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Definition
| Specialized epithelial cells that have contractile capability which are tightly woven as a single intermittent layer around the periphery of each adenomere, but inside the basement membrane. |
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Term
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Definition
| Cell aggregates of epithelial origin with common structures and secretory functions |
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Term
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Definition
| Manner in which exocrine glands secrete their products |
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Term
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Definition
| Secretion method by which glandular products are secreted by exocytosis. Cell product is delivered through the cell membrane by membrane-bound vesicles that are fused with the cell membrane and in this manner keeps the cell membrane intact |
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Term
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Definition
| the discharge from a cell of the particles that are too large to diffuse through the plasma membrane |
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Term
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Definition
| Secretion method by with part of the apical cytoplasm is discharged along with the secretory product. |
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Term
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Definition
| Secretion method involving cell detachment and subsequent death. The entire content of the cell contributes to the secretory product |
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Term
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Definition
| Chemical makeup of secretions from the glands |
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Term
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Definition
| Glands wich produce clear, watery proteinaceous fluid |
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Term
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Definition
| Glands which produce viscid fluid of glycoproteins and polysaccharides |
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Term
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Definition
| Glands which produce viscid fluid of glycoproteins and polysaccharides |
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Term
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Definition
| Glands that produce both serous and mucous secretions |
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