urachus


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Related to urachus: patent urachus

urachus

 [u´rah-kus]
a fetal canal connecting the bladder with the allantois, persisting throughout life as a cord (median umbilical ligament). adj., adj u´rachal.
patent urachus a condition in which the urachus remains a hollow tube connecting the bladder and the umbilicus, resulting in an umbilical urinary fistula.

u·ra·chus

(yūr'ă-kŭs),
That part of the allantois between the apex of the bladder and the umbilicus; postnatally, the urachus is normally merely a fibrous cord, the median umbilical ligament, but occasionally the allantoic lumen may persist as a urachal fistula.
[G. ourachos, the urinary canal of a fetus]

urachus

/ura·chus/ (u´rah-kus) a fetal canal connecting the bladder with the allantois, persisting throughout life as a cord (median umbilical ligament).u´rachal

urachus

[yo̅o̅r′əkəs]
Etymology: Gk, ourachos, urinary tract
in the fetus, an epithelial tube connecting the apex of the urinary bladder with the umbilicus. It persists throughout life as the median umbilical ligament.

urachus

A vestigial structure located at the bladder apex which connects the bladder with the allantois in the embryo. The lumen of the urachus may persist in one-third of adults and traverse the bladder wall as a tubular or cystic structure of little clinical significance.

ura·chus

(yūr'ă-kŭs)
That portion of the allantois between the apex of the bladder and the umbilicus; becomes the median umbilical ligament.
[G. ourachos, the urinary canal of a fetus]

urachus

A primitive structure in the embryo from which the bladder develops. Later it is represented by a fibrous cord that extends from the top of the bladder to the UMBILICUS.

urachus

a fetal canal connecting the bladder with the allantois via the navel. It mostly disappears in the neonatal period although a nipple-like projection may remain on the bladder and in some species a cord may persist along the cranial border of the median ligament of the bladder.

persistent urachus
failure of the urachus to obliterate at birth so that urine dribbles from it continuously. The urine may also be passed from the urethra. Retrograde infection from an omphalitis is common, resulting in cystitis. Called also pervious urachus.
References in periodicals archive ?
Glandular tumours of the urachus remain sparsely described due to rarity, degree of clinical correlation required to establish urachal origin, and lack of standardized nomenclature.
Other mucinous cystic lesions of the urachus include mucinous cystadenoma and cystadenocarcinoma.
The patent urachus in continuity with its associated allantoic cyst (Figure 1D).
The urachus is a cord or band of fibrous tissue extending from the bladder to the umbilicus.
Embryology, anatomy, and diseases of the umbilicus together with diseases of the urachus.
The tubular urachus undergoes progressive involution, resulting in an obliterated, fibrous cord by 32 weeks' gestation.
As this is a rare case, our initial diagnosis was carcinoma of urachus due to the tumour's site, so we removed the partial urachus nearby the bladder simultaneously.
In early fetal development, the ventral cloaca (precursor of the urinary bladder) is connected to the allantois via the urachus, which undergoes progressive involution, resulting in an obliterated, fibrous cord by 32 weeks' gestation.
Most cases arise in the dome, trigone or urachus of the urinary bladder.
These include the colon, stomach, gallbladder, pancreas, urachus, urinary bladder, uterine corpus, fallopian tube, breast and lung.