Glands Flashcards
Definition of gland
Organ
composed of cells specialized
for secretion
Glandular products
proteins
lipids
protein/carb complexes
Stroma
connective tissue
supports parenchyma
Parenchyma
epithelial tissue component of gland
Derivation of glands
invagination of epithelial surfaces
exocrine glands
ducts
secrete onto epithelial surfaces
endocrine glands
NO ducts
secrete into blood or lymphatic stream
mixed glands
both exocrine and endocrine components
eg. pancreas; testes
merocrine (eccrine) gland
cells remain intact
product released through membrane
apocrine gland
portion of cell is lost during secretary process
holocrine gland
entire cell leaves as product
serous gland
thin, watery secretion rounded nuclei near base of cell strongly basophilic free ribosomes and RER some granular material
mucus gland
viscous, slippery secretion
flattened nuclei near base of secretory unit
not basophilic
bubbly or foamy apical cytoplams
mixed gland
mucous and serous secretory portions
demilunes
demilunes
crescent-shaped groups of serous cells capping mucous secreting units
goblet cell
unicellular gland
guidelines for classifying multicellular glands
- extent of branching
2. shape of secretory unit
simple glands
no branching of ducts
compound glands
duct branches
tubular shape secretory unit
tubular
alveolar, acinar, saccular shape
shape of sac or alveolus
tubuloalveolar shape
portions of both tubular and alveolar secretory shapes
myoepithelial cells: occurrence
sweat glands
mammary glands
salivary glands
myoepithelial cells: structure
star-shaped
- central nucleus
- long cytoplasmic processes
myoepithelial cells: location
between basal lamina and base of secretory cells
myoepithelial cells: function
help secretory process by pressing on secretory cells
