- Duct (anatomy)
Duct Dissection of a lactating breast.
1 - Fat
2 - Lactiferous duct/lobule
3 - Lobule
4 - Connective tissue
5 - Sinus of lactiferous duct
6 - Lactiferous duct
Section of the human esophagus. Moderately magnified. The section is transverse and from near the middle of the gullet.
a. Fibrous covering.
b. Divided fibers of longitudinal muscular coat.
c. Transverse muscular fibers.
d. Submucous or areolar layer.
e. Muscularis mucosae.
f. Mucous membrane, with vessels and part of a lymphoid nodule.
g. Stratified epithelial lining.
h. Mucous gland.
i. Gland duct.
m’. Striated muscular fibers cut across.
Types of ducts
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 Submaxillary duct submaxillary gland mouth saliva Major sublingual duct sublingual gland mouth saliva Bartholin's ducts Bartholin's glands Vulva Bartholin's fluid
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 simple columnar epithelium (or pseudostratified epithelium), reserving the stratified columnar for the lobar ducts.
- duct at eMedicine Dictionary
- Organology at UC Davis termscells&tissues/epithelial/exocrinegland/exocrinegland1 - "Exocrine gland (LM, Low)"
- Overview at uwa.edu.au
- Overview at siumed.edu
Epithelial cells Surface epithelium Gland/
endocrine)MechanismShapeSecretionSerous glands · Mucous glandsComponents
see also Template:Epithelial neoplasms This anatomy article is a stub. You can help Wikipedia by expanding it.