(n.) A conductor, conduit, or artificial channel for conveying water, especially one for supplying large cities with water.
(n.) A canal or passage; as, the aqueduct of Sylvius, a channel connecting the third and fourth ventricles of the brain.
Example Sentences:
(1) In addition to the aqueduct other associated inner ear anomalies have been identified in 60% of this population including: enlarged vestibule (14); enlarged vestibule and lateral semicircular canal (7); enlarged vestibule and hypoplastic cochlea (4); and hypoplastic cochlea (4).
(2) When histamine (5 micrograms) was injected into three different levels of the ventricular system, the magnitude and duration of the resulting increases in plasma epinephrine and glucose were in the following rank order: the third ventricle greater than aqueduct much greater than fourth ventricle.
(3) The majority of the responsive neurons were located in regions surrounding the aqueduct and the medial part of PAG.
(4) When outcome was examined in patients who were stuporous or comatose on admission, a significant increase in septal shift was found among patients with a poor outcome, but there was no significant relationship between outcome and degree of pineal or aqueductal shift.
(5) This is the first case of a fulminant phase of mumps ventriculitis leading to aqueductal stenosis, which has been treated using a ventriculoscope for the first time.
(6) A series of 55 cases is described in which hydrocephalus associated with non-neoplastic narrowing of the Sylvian aqueduct produced symptoms for the first time in adult life.
(7) With systole there is downward (caudal) flow of CSF in the aqueduct of Sylvius, the foramen of Magendie, the basal cisterns and the dorsal and ventral subarachnoid spaces while during diastole, upward (cranial) flow of CSF in these same structures is seen.
(8) A patent cochlear aqueduct indicated on computed tomography scan was found and repaired through a posterior cranial fossa approach.
(9) Rats from the H-Tx strain develop hydrocephalus through a developmental obstruction of the cerebral aqueduct.
(10) In group A, kaolin was present in the fourth ventricle and Sylvian aqueduct.
(11) SE images obtained with gradient moment nulling did not allow confident distinction between patent and obstructed aqueducts.
(12) The signal intensity of the cerebrospinal fluid (CSF) in the cerebral aqueduct and lateral ventricles on magnetic resonance (MR) images was evaluated in 16 healthy individuals and in 32 patients with various forms of hydrocephalus (20 with chronic normal pressure hydrocephalus [NPH], seven with acute communicating hydrocephalus, and five with hydrocephalus ex vacuo [atrophy]).
(13) Tentorial herniation secondary to supratentorial mass lesions will cause aqueductal compression and raised intraventricular pressure.
(14) However, these cytoplasmic edema of the ependymal and glial cells totally subsided by day 30 postinjection, leaving an obliterated aqueduct with a few remnants of ependymal cells without reactive gliosis.
(15) The effect of intracranial pressure on cerebrospinal fluid formation has been studied in cats by ventricular perfusion with the aqueduct of Sylvius blocked (isolated ventricular perfusion).
(16) The disappearance of patency in the cochlear aqueduct is a progressive phenomenon reflecting the biological process of aging in the organism.
(17) The results suggest that under physiological conditions the CSF also flows through the cochleae aqueduct and the protein concentration in the Scala tympani decreases especially in the basal winding.
(18) We demonstrate that the stenosis of the aqueduct is a secondary phenomenon, not causally related to the pathogenesis of hydrocephalus, and discuss the significance of this finding to human aqueduct stenosis.
(19) In the other 71%, the pars rugosa in the vestibular aqueduct was surrounded by dura more commonly than normal.
(20) In this paper we attempted MR visualization of the vestibular aqueduct (VA) with a surface coil.
Noria
Definition:
(n.) A large water wheel, turned by the action of a stream against its floats, and carrying at its circumference buckets, by which water is raised and discharged into a trough; used in Arabia, China, and elsewhere for irrigating land; a Persian wheel.