BMS 250 Chapter Notes - Chapter 5: Eccrine Sweat Gland, Simple Columnar Epithelium, Exocytosis
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Pseudostratified columnar epithelium: this epithelium is not really stratified because all of its cells are in direct contact with the basement membrane. Pseudostratified ciliated columnar contains cilia on its apical surface. The ciliated form housed goblet cells that secrete mucin, which hydrates to become the mucus that traps foreign particles and is moved by the beating cilia. This type is found in the larger air passageways of the respiratory system. The nonciliated form is rare, lacks goblet cells and cilia, and occurs primarily in part of the male urethra and epididymis. Stratified squamous epithelium: has multiple cell layers, and only the deepest layer of cells in direct contact with the basement membrane. The cells in the basal layers have a cuboidal or polyhedral shape, whereas the apical cells display a flattened, squamous shape. The epithelium is adapted to protect underlying tissues from damage caused by abrasion and friction.
