Epithelial Tissue Flashcards
How can the basement membrane be stained?
With the Periodic Acid Schiff (PAS) reaction
Describe, in order of most proximal to the epithelial layer to most distal, the basement membrane.
Lamina lucida: low in density, so clear when stained
Lamina densa: electron-dense, stains darkly, composed mainly of proteoglycans and a certain type of collagen
Reticular lamina: composed of reticular fibers, connects lamina densa to subepithelial connective tissue
Give an example of simple squamous epithelium.
lining of blood vessels, pleural and peritoneal cavities, pulmonary alveoli, and glomerular capsule
Give an example of simple cuboidal epithelium.
thyroid gland, collecting tubules, collecting ducts of the kidney
Give an example of simple columnar epithelium.
stomach, intestine, and gall bladder
Give an example of pseudostratified columnar epithelium.
trachea and brinchi (both are also ciliated)
Give an example of stratified squamous epithelium.
keratinized: skin
non-keratinized: cornea
Give an example of stratified cuboidal epithelium.
lining of the excretory duct of glands
Give an example of stratified columnar epithelium.
parotid and mandibular gland ducts
Give an example of transitional epithelial.
urinary bladder and urethra
Give an example of a tissue with straight tubular glands.
large intestine
Give an example of a tissue with coiled tubular glands.
sweat gland
Give an example of a tissue with simple branched tubular glands.
stomach
Give an example of a tissue with simple alveolar/acinar glands.
sebaceous gland
Give an example of a tissue with simple branched alveolar/acinar glands.
large sebaceous gland
Give an example of a tissue with simple tubulo-acinar gland
minor salivary gland of oral cavity
Give an example of a compound alveolar/acinar gland tissue.
parotid gland
Give an example of a compound tubulo-acinar gland tissue.
pancreas
Describe serous glands.
They produce a thin, watery secretion with zymogen granules. The nucleus is positioned in the center of the cell.
Give an example of a serous gland
parotid gland
Describe mucous glands.
Produce a thick secretion that acts as a protective covering. They stain lightly with H&E because of mucin. The nuclei are flattened and displaced towards the basal part of the cell
Give an example of a seromucous gland.
mandibular salivary gland
Which mode of release secretes granules via exocytosis?
Merocrine
Which mode of release secretes membrane-bounded granules with cytoplasm? Give an example.
Apocrine, eg. sweat and mammary glands
Which mode of release has the entire cell as the secretory product? Give an example.
Holocrine, eg. sebaceous glands
Which mode of release secretes products directly from one cell to the next? Give an example.
Cytocrine, eg. transfer of melanin pigment from melanocytes to keratinocytes
