Duct (anatomy)

Source: Wikipedia, the free encyclopedia.
For qualities of writing or speech, see Ductus (linguistics).
Duct
Striated muscular fibers cut across.
Identifiers
FMA30320
Anatomical terminology]

In

organ
.

Types of ducts

Examples include:

Duct From To Carries
Lactiferous duct mammary gland nipple milk
Cystic duct gallbladder common bile duct bile
Common hepatic duct liver common bile duct bile
Common bile duct common hepatic duct and cystic duct pancreatic duct bile
Pancreatic duct pancreas
hepatopancreatic ampulla
 bile and pancreatic enzymes
Ejaculatory duct vas deferens urethra semen
Parotid duct parotid gland mouth saliva
Submandibular duct submandibular gland mouth saliva
Major sublingual duct sublingual gland mouth saliva
Bartholin's ducts
Bartholin's glands
 vulva Bartholin's fluid
Cerebral aqueduct fourth ventricle third ventricle cerebrospinal fluid

Duct system

As ducts travel from the acinus which generates the fluid to the target, the ducts become larger and the epithelium becomes thicker. The parts of the system are classified as follows:

Type of duct Epithelium Surroundings
intralobular duct
simple cuboidal
 parenchyma
interlobular duct
simple columnar
 connective tissue
interlobar duct
stratified columnar
 connective tissue

Some sources consider "lobar" ducts to be the same as "interlobar ducts", while others consider lobar ducts to be larger and more distal from the acinus. For sources that make the distinction, the interlobar ducts are more likely to classified with

pseudostratified epithelium
), reserving the stratified columnar for the lobar ducts.

Intercalated duct

Intercalated duct (ducts of Boll)
Exocrine glands
Identifiers
FMA30320
Anatomical terms of microanatomy]

The intercalated duct, also called intercalary duct (ducts of Boll), is the portion of an

simple cuboidal.[1]

They are found in both the pancreas[2][3][4] and in salivary glands.[5][6][7]

Striated duct

Striated duct in parotid gland

A striated duct (Pflüger's ducts) is a

intercalated duct to an interlobular duct. It is characterized by the basal infoldings of its plasma membrane, characteristic of ion-pumping activity by the numerous mitochondria.[8][9]
Along with the intercalated ducts, they function to modify salivary fluid by secreting HCO3− and K+ and reabsorbing Na+ and Cl− using the Na-K pump and the Cl-HCO3 pump, making the saliva hypotonic.

Their

simple columnar.[10]

Striated ducts are part of the

intralobular ducts
.

They are found in the

sublingual duct, and the parotid gland, but are more developed in the parotid gland.[13]

They are not present in pancreas.

Intralobular duct

An intralobular duct is the portion of an

striated duct
.

In the human mammary gland, the intralobular duct is a part of the glandular system that resides within the lobules. Lobules contain clusters of ducts whose secretory alveolies are drained by the intralobular duct. The intralobular ducts are usually lined with simple cuboidal epithelial cells that are lined by myoepithelial cells as well.

The intralobular ducts of the lobules drain into the interlobular ducts between lobules.

They can be seen in:

See also

References

  1. ^ "Histology of Glands". Southern Illinois University. Retrieved 23 May 2011.
  2. ^ Anatomy photo: digestive/mammal/pancreas/pancreas1 - Comparative Organology at University of California, Davis - "Mammal, pancreas (LM, Medium)"
  3. ^ "Slide at uottawa.ca". Archived from the original on 2004-09-19. Retrieved 2019-05-29.
  4. ^ Nosek, Thomas M. "Section 6/6ch4/s6ch4_17". Essentials of Human Physiology. Archived from the original on 2016-03-24.
  5. ^ "Slide at usc.edu". Archived from the original on 2007-05-05. Retrieved 2019-05-29.
  6. ^ Anatomy photo: Digestive/mammal/salivary1/salivary3 - Comparative Organology at University of California, Davis - "Mammal, salivary glands (LM, Medium)"
  7. ^ Nosek, Thomas M. "Section 6/6ch4/s6ch4_4". Essentials of Human Physiology. Archived from the original on 2016-03-24.
  8. ^ Anatomy photo: Digestive/mammal/salivary2/salivary1 - Comparative Organology at University of California, Davis - "Mammal, salivary glands (EM, Low)"
  9. ^ Anatomy photo: Digestive/mammal/salivary1/salivary4 - Comparative Organology at University of California, Davis - "Mammal, salivary glands (LM, Medium)"
  10. ^ SIU SOM Histology GI
  11. ISBN 978-0195151732
    .
  12. ^ "Histology at umdnj.edu". Archived from the original on 2006-12-30. Retrieved 2019-05-29.
  13. ^ "Oral histology at usc.edu". Archived from the original on 2007-05-05. Retrieved 2019-05-29.
  14. ^ Nosek, Thomas M. "Section 6/6ch4/s6ch4_17". Essentials of Human Physiology. Archived from the original on 2016-03-24.
  15. ^ Overview in pancreas at downstate.edu
  16. ^ "Slide at uottawa.ca". Archived from the original on 2007-02-17. Retrieved 2019-05-29.
  17. ^ "Slide at uiowa.edu". Archived from the original on 2006-09-04. Retrieved 2019-05-29.

External links

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