Lab Chapter 3: Histology: Epithelium Flashcards
1. Recognize each major tissue type found on the virtual slides. 2. Recognize each specific epithelial tissue by its complete name. 3. State the function and location in the body of each specific tissue type. 4. Locate and identify all boldface terms (structures, etc.) on slides, models, and/or specimens (as appropriate).
Four Major Classes of Tissues
epithelial tissue, connective tissue, muscle tissue and nervous tissue
Epithelium
tissue composed of tightly bound cells that covers or lines all external and internal body surfaces and forms glands
Basement Membrane
found between the epithelium and the underlying connective tissue; thin layer made of intercellular substances
Avascular
no blood vessels within the tissue
Squamous
Cells that are flat and scale-shapped
Cuboidal
Cells that are approximately as wide as they are tall
Columnar
Cells are rectangular or column-shapped
Tissues
Aggregations of cells and cell products of similar structure and embryonic origin
Histology
The study of tissues
Simple Epithelium
Epithelial tissues that are arranged in a single layer with every cell having direct contact with the basement membrane; can be found where there is not much wear and tear or where diffusion or absorption occurs through a membrane
Stratified
Epithelial tissues with multiple layers of cells with only the deepest layer in contact with the basement membrane
Simple Squamous Epithelium
Single layer of flat, scale-like cells that function in diffusion and filtration
Location: lining of ventral body cavity, lining of heart and blood vessels (endothelium), kidney (glomerular capsule), covering all internal organs, alveoli of lungs
Simple Cuboidal Epithelium
Single layer of cube-shaped cells with round, dark-stained nuclei located in center of cell; cells resemble a string of beads. They function in secretion and absorption
Location: glands, ducts and kidney tubules
Simple Columnar Epithelium
Single layer of rectangular cells with oval-shaped nuclei located at basal end of cell that you can draw a line through all nuclei; they function in secretion and absorption
Location: lining of digestive tract, gallbladder, uterine tubes and collecting ducts of kidney
Goblet Cells
Specialized columnar cells that secrete a protective layer of mucus along the lumen of intestines and trachea
