Epithelium Flashcards
Epithelium function
provide protection(cover surfaces) and also function in secretion and absorption
Cancer of epithelial tissues
carcinomas
Basement membrane consists of
basal lamina and reticular lamina
Functions of basal lamina
1) Attachment 2) Filtration 3) Tissue compartmentalization 4) confers cell polarity and shape
What type of collagen is in basal lamina
Type IV Collagen
What type of collagen is in reticular lamina
Type III Collagen
Simple Squamous Epithelium
Lining of vascular system/Lining of body cavities/ lining of respiratory spaces in lung/Bowman’s capsule in kidney
Endothelium
lining of vascular system
Mesothelium
lining of body cavities
Stratified Squamous
Epidermis/lining of oral cavity/esophagus/lining of vagina
Simple Cuboidal
Small ducts of exocrine glands/ kidney tubules/ ovary “germinal” epithelium/thickness varies depending on location
Simple Columnar
Small intestine and colon lining/gallbladder lining/stomach lining and gastric glands
Pseudostratified Columnar Epithelium
Appears to have many layers, but all cells in contact with basal lamina. Found in trachea, bronchi lining/ lining of ductus deferens/ efferent ductules of epididymis
Stratified Cuboidal
Sweat gland ducts/ anorectal junction/ large ducts of exocrine glands
Largest exocrine gland ducts (salivary)
Stratified Columnar
Transitional Epithelium found in
Renal calyces/bladder/urethra/ureter
Exocrine glands
secrete products onto surface via ducts
Endocrine glands
no ducts. secrete into connective tissue spaces where they are absorbed into bloodstream by capillaries
Glands originate from an
epithelium and penetrates the connective tissue and form secretory units
Unicellular glands
composed of a single cell
Multicellular glands
composed of more than 1 cell
How are multicellular glands classified
1)based on duct branching as simple glands or compound glands 2) based on the shape of the secretory unit as acinar, alveolar, or tubular
Name 3 types of gland secretions
Mucus, serous, mixed
Mucus
viscous material, which protects and lubricates cell surfaces . In H and E stained sections, mucous appear translucent. Dark magenta with PAS stain
Serous secretions
watery secretions often rich in enzymes
Mixed secretions
contain both mucus and serous substances.
Only _________ glands can have mixed secretions
multicellular
Merocrine
cells release their contents by exocytosis
Apocrine
part of the secretory cell apical cytoplasm is released along with the contents
Holocrine
entire secretory cell and contents
