Intercalated and Striated ducts

NOTE : all this from my reading in some scientific website and articles

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1. striated Ducts


Intercalated Ducts


intercalated duct secretory end pieces Receive the
1 ry saliva
from
columnar with a centrally placed nucleus and pale, acidophilic
cytoplasm.
 Lined by a simple cuboidal epithelium , central nucleus
and myoepithelial cells.
 Centrally placed nuclei.
 . Small rER.
 . Small Golgi complex.
 Few small secretory granules in the apical cytoplasm.
 The apical surface has a few short microvilli projecting
into the lumen
The duct
cells
Tight junctions.
2. Junctional complex.
(but lack of gap junctions).
1. Apical junctional complex.
2. Scattered desmosomes.
3. Gap junctions .
4. Folded processes of adjacent cells.
lateral
surfaces are
joined by
• contains:
1. Small secretory granules (filled with proteins).
2. Vesicles (endocytosis from lumen).
3. Numerous lysosomes.
4. Peroxisomes (get rid of toxic substances like hydrogen peroxide,
or other metabolites)
5. Gylcogen deposits (in perinuclear cytoplasm).
Few small secretory granules The apical
cytoplasm
• Largest portion of the duct system.
• Located within the lobules (intralobular).
• Undifferentiated cells (stem cell) in the intercalated ducts
may proliferate and undergo differentiation to replace
charactristic

2. • The lumen is larger than those of secretory cells and
intercalated ducts.
• Surrounded by a basal lamina The duct cells show basal
striations result from numerous RADIALLY arranged
mitochondria (why) in narrow cytoplasmic partitions,
separated by highly infolded basolateral membrane (EM).
•
damaged or dying cells in the end pieces and striated
ducts.
• Because of their small size, the duct are difficult to
identify in routin histologic sections.

• Modification of 1ry saliva by reabsorption and secretion of
electrolytes (Ca
2+, Cl
-, Na
+, HCO
- , K
+).

replace damaged or dying cells in the end pieces and
striated ducts.
function