vitelline duct

vitelline duct,

(in embryology) the narrow channel connecting the yolk sac with the intestine. Also called umbilical duct.

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duct

a passage with well-defined walls, especially a tubular structure for the passage of excretions or secretions. See also ductus.

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accessory pancreatic duct

the duct of the dorsal pancreatic primordium that opens on the minor duodenal papilla. Called also Santorini's duct or duct of Santorini.

allantoic duct

see urachus.

alveolar duct

one of the final branches of the bronchial tree consisting of a tube whose walls are composed of alveoli.

bile duct, biliary duct

the passages for the conveyance of bile in and from the liver. See also bile duct.

cochlear duct

a spiral membranous tube in the bony canal of the cochlea divided into the scala tympani, scala vestibuli and spiral lamina.

common bile duct

a duct formed by the union of the cystic and hepatic ducts. See also bile duct.

cystic duct

the passage connecting the gallbladder neck and the bile duct.

efferent duct

any duct that gives outlet to a glandular secretion.

ejaculatory duct

the duct formed by union of the ductus deferens and the duct of the seminal vesicles, opening into the prostatic urethra on the colliculus seminalis. Found in the horse and ruminants.

endolymphatic duct

a canal connecting the membranous labyrinth of the ear with the endolymphatic sac.

epididymal duct

developed from the first part of the mesonephric duct.

excretory duct

one through which the secretion is conveyed from a gland.

duct of Gartner

see gartner's ducts.

hepatic duct

the excretory duct of the liver, or one of its branches in the lobes of the liver. See also bile duct.

incisive duct

one of a pair of ducts perforating the palate and which communicate between the mouth and the nasal cavity; they are thought to conduct chemicals for olfactory appraisal by the vomeronasal organ.

intralobar duct

ducts within lobes which provide drainage for secretions of lobes of glands.

intralobular duct

ducts found within lobules which provide drainage for secretions of lobules of glands.

lacrimal duct

one of the excretory ducts of the lacrimal gland. See also lacrimal apparatus.

lacrimonasal duct

nasolacrimal duct.

lactiferous duct

ducts conveying the milk secreted by the lobes of the mammary gland to the lactiferous sinuses or to the teats.

lobar duct

drains the secretions from the lobes of gland, connecting with the main excretory duct.

lobular duct

drains the secretions of lobules of glands.

lymphatic duct

larger lymph drainage vessels, e.g. thoracic duct.

lymphatic duct (left)

thoracic duct.

lymphatic duct (right)

a vessel draining lymph from the cranial right side of the body, receiving lymph from the right subclavian, jugular and mediastinal trunks when those vessels do not open independently into the right brachiocephalic vein.

mammary duct

lactiferous ducts.

mandibular duct

drainage duct of the mandibular salivary gland.

mesonephric duct

see mesonephric duct.

metanephric duct

the embryonic ureter.

müllerian duct

see müllerian duct.

nasal duct

the duct leading from the lacrimal sac, opening on the floor of the nasal vestibule. Called also nasolacrimal duct. See also lacrimal apparatus.

nasolacrimal duct

see nasal duct (above).

nasopalatine duct

see incisive duct (above).

pancreatic duct

the main excretory duct of the pancreas, which usually opens with the bile duct on the major duodenal papilla; may be a single duct, or two ducts which join, or two independent ducts opening into opposite sides of the intestine. See also bile duct. Called also Wirsung's duct.

papillary d's (kidney)

the straight excretory or collecting portions of the renal tubules, which descend through the renal medulla to a renal papilla or renal crest.

papillary duct (teat)

see teat canal.

paramesonephric duct

müllerian duct.

parotid duct

the duct by which the parotid gland empties into the mouth vestibule opposite the upper molars. See also parotid glands.

perilymphatic duct

see aqueduct of cochlea.

pronephric duct

the early embryonic duct from the primitive kidney which leads into the mesonephric duct in the embryo's later stages.

prostatic d's

minute ducts from the prostate, opening into or near the prostatic sinuses on the dorsal wall of the urethra.

salivary d's

the ducts of the salivary glands.

semicircular d's

the long ducts of the membranous labyrinth of the ear.

sublingual duct

the excretory ducts of the sublingual salivary glands.

submandibular duct

the duct that drains the submandibular gland and opens at the sublingual caruncle. Called also submaxillary duct.

submaxillary duct

submandibular duct (above).

tear duct

nasolacrimal duct.

thoracic duct

a duct beginning in the cisterna chyli and emptying into the venous system at the junction of the left subclavian and left jugular veins. It acts as a channel for the collection of lymph from the portions of the body caudal to the diaphragm and from the left side of the body cranial to the diaphragm.

thyroglossal duct

the transient, non-patent duct, from the thyroid gland to the floor of the pharynx which is the legacy of the development of the thyroid from the floor of the pharynx.

vitelline duct

see meckel's diverticulum.