Duct (anatomy)

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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.

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Overview

In anatomy and physiology, a duct is a circumscribed channel leading from an exocrine gland or organ.

Types of ducts

Examples include:

Duct	From	To	Carries
Lactiferous duct	mammary gland	nipple	milk
Cystic duct	spleen	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

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

Additional images

Section of submaxillary gland of kitten. Duct semidiagrammatic. X 200.

Section of portion of mamma.

External links

• duct at eMedicine Dictionary
• d_29/12313857 at Dorland's Medical Dictionary
• Organology at UC Davis termscells&tissues/epithelial/exocrinegland/exocrinegland1 - "Exocrine gland (LM, Low)"
• Overview at uwa.edu.au
• Overview at siumed.edu

v • d • e Glands (Endocrine, Exocrine)
Classification	mechanism (Merocrine, Apocrine, Holocrine) shape (Tubular gland, Alveolar gland) secretion (Serous glands, Mucous glands, Serous demilune)
Ducts	Interlobar duct, Interlobular duct, Intralobular duct (Striated duct, Intercalated duct), Acinus

v • d • e WikiDoc Research Resources for Duct (anatomy)
Articles on Duct (anatomy)	Most recent articles on Duct (anatomy) • Most cited articles on Duct (anatomy) • Review articles on Duct (anatomy) • Articles on Duct (anatomy) in N Eng J Med, Lancet, BMJ
Media (Slides, Video, Images, MP3) on Duct (anatomy)	Powerpoint slides on Duct (anatomy) • Images of Duct (anatomy) • Photos of Duct (anatomy) • Podcasts & MP3s on Duct (anatomy) • Videos on Duct (anatomy)
Evidence Based Medicine Regarding Duct (anatomy)	Cochrane Collaboration on Duct (anatomy) • Bandolier on Duct (anatomy) • TRIP on Duct (anatomy)
Cost Effectiveness of Duct (anatomy)	Cost Effectiveness of Duct (anatomy)
Clinical Trials Involving Duct (anatomy)	Ongoing Trials on Duct (anatomy) at Clinical Trials.gov • Trial results on Duct (anatomy) • Clinical Trials on Duct (anatomy) at Google
Guidelines / Policies / Government Resources (FDA/CDC) Regarding Duct (anatomy)	US National Guidelines Clearinghouse on Duct (anatomy) • NICE Guidance on Duct (anatomy) • NHS PRODIGY Guidance • FDA on Duct (anatomy) • CDC on Duct (anatomy)
Textbook Information on Duct (anatomy)	Books and Textbook Information on Duct (anatomy)
Pharmacology Resources on Duct (anatomy)	Dosing of Duct (anatomy) • Drug interactions with Duct (anatomy) • Side effects of Duct (anatomy) • Allergic reactions to Duct (anatomy) • Overdose information on Duct (anatomy) • Carcinogenicity information on Duct (anatomy) • Duct (anatomy) in pregnancy • Pharmacokinetics of Duct (anatomy) •
Genetics, Pharmacogenomics, and Proteinomics of Duct (anatomy)	Genetics of Duct (anatomy) • Pharmacogenomics of Duct (anatomy) • Proteomics of Duct (anatomy)
Newstories on Duct (anatomy)	Duct (anatomy) in the news • Be alerted to news on Duct (anatomy) • News trends on Duct (anatomy)
Commentary on Duct (anatomy)	Blogs on Duct (anatomy)
Patient Resources on Duct (anatomy)	Patient resources on Duct (anatomy) • Discussion groups on Duct (anatomy) • Patient Handouts on Duct (anatomy) • Directions to Hospitals Treating Duct (anatomy) • Risk calculators and risk factors for Duct (anatomy)
Healthcare Provider Resources on Duct (anatomy)	Symptoms of Duct (anatomy) • Causes & Risk Factors for Duct (anatomy) • Diagnostic studies for Duct (anatomy) • Treatment of Duct (anatomy)
Continuing Medical Education (CME) Programs on Duct (anatomy)	CME Programs on Duct (anatomy)
International Resources on Duct (anatomy)	Duct (anatomy) en Espanol • Duct (anatomy) en Francais
Business Resources on Duct (anatomy)	Duct (anatomy) in the Marketplace • Patents on Duct (anatomy)
Informatics Resources on Duct (anatomy)	List of terms related to Duct (anatomy)

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .