Microscopic Anatomy Of The Gland Flashcards
During fetal development epithelial cells proliferate and penetrate the underlying connective tissue and differentiate into
glandular epithelial tissue.
If secretion from the glandular tissue reach to the surface of the lining or covering epithelium by a duct lined with epithelium,
then gland is called exocrine gland.
The glandular tissue if loses its connection with lining epithelium from which it developed, and then it develops into
Endocrine gland
The cells of endocrine glands, which secrete hormones, are arranged in the form of
cords or in the form of follicles with lumens for storing the secretory product.
From either the cords or follicles of endocrine cells, the secretory product is released outside the cells and taken up by the
blood vessels for distribution throughout the body.
Exocrine and endocrine gland are covered by
connective tissue capsule
Unicellular glands
Single cell as a gland
Simple tubular
- Large intestine
- Intestinal glands of colon
Simple
Alveolar/Acinar
Urethra
Paraurethral glands
Compound tubular
Duodenum
Brunner’s glands
Compound alveolar/Avinar
Pancreas
Compound Tubuloalveolar/Acinar
Submandibular,
lacrimal glands
cell produces a signal to induce changes in nearby cells
Paracrine glands
Unicellular glands
Goblet cells
Most exocrine glands are
Merocrine glands
Example of merocrine
Pancreatic acinar cells, Salivary glands
Holocrine
-Sebaceous glands of hair follicles -Tarsal (Meibomian) glands of the eyelids
Holcrine
Both secretory products and cell debris are discharged into lumen of the gland.
involves loss of a large membrane-enclosed portion of apical cytoplasm, usually containing one or more lipid droplets.
Apocrine
Apocrine gland
Mammary glands
- Ciliary gland of eyelid
Serous gland
Thin & watery
Mucous
Viscous & slimy secretion
Serous acinar cells are roughly pyramid-shaped
with its apex at the lumen
Serous cells nucleus is
Rounded or oval shaped
Mucous cells
Sublingual salivary glands, Gland in the respiratory tract, and the genital tract.
Seromucous
submandibular salivary glands have both mucous and serous secretory units,
muscle like cells located between the bases of epithelial cell and the basal lamina.
Myoepithelial cells.
Specialized for contraction-have actin and myosin
Myoepthelial cells
the expulsion of secretory products into the duct is aided by
The Contraction of the myoepithelial cell compresses the acinus
