(n.) Curtain or covering; -- applied to various membranous partitions, especially to the soft palate. See under Palate.
(n.) See Veil, n., 3 (b).
(n.) A thin membrane surrounding the sporocarps of quillworts Isoetes).
(n.) A veil-like organ or part.
(n.) The circular membrane that partially incloses the space beneath the umbrella of hydroid medusae.
(n.) A delicate funnel-like membrane around the flagellum of certain Infusoria. See Illust. a of Protozoa.
Example Sentences:
(1) MRI revealed cranium bifida and agenesis of anterior medullar velum.
(2) To compare biochemical differences between bivalves with and without endosymbiotic chemoautotrophic bacteria, specimens of Solemya velum, a bivalve species known to contain bacterial endosymbionts, and the symbiont-free soft-shelled clam Mya arenaria, were collected from the same subtidal reducing sediments during October and November 1988.
(3) The Z-plasties facilitate effective dissection and redirection of the palatal muscles to produce an overlapping muscle sling and lengthen the velum without using tissue from the hard palate, which permits hard palate closure without pushback or lateral relaxing incisions.
(4) We now report that, compared to controls, rats with acute EAE exhibit fewer detectable mast cells in their dura mater and velum interpositum.
(5) The superior medullary velum was not recognized in 10 cases and the corpus medullare in 5.
(6) Its efficacy is generally accepted, and its use, especially in cases of obstructive sleep apnea syndrome, is the only treatment of the palatal velum at present practiced.
(7) The axons originate in dorsal dendrites, run dorsally along the border of the gray matter and pierce the velum medullare on the contralateral side.
(8) While coughing the movement of the velum is purely passive because of the exspirational thrust.
(9) The velopharyngeal closure patterns can be grouped into five categories according to the manner of the velum and lateral pharyngeal wall movements.
(10) Few 5-HT nerve terminals occurred only on the roof of the fourth ventricle (velum medullare, lamina epithelialis of the tela chorioidea), and the surface of the choroid plexus epithelia was devoid of such nerves.
(11) The inferior medullary velum and tela choroidea were removed intact from the fourth ventricle, post-osmicated, dehydrated, critical point dried, coated with palladium-gold and examined in a Cambridge Stereoscan S4 scanning electron microscope.
(12) The clinical presentation, radiological findings, and surgical management of two cases of meningioma arising from the velum interpositum without dural attachment are described.
(13) The delta 13C and delta 15N ratios of the amino acids are very similar to the isotope ratios previously found in both the endosymbionts and whole tissues of S. velum.
(14) Five patients evaluated via multi-view videofluoroscopy were found to have incongruous movements between the velum and lateral aspects of the pharyngeal walls.
(15) They are lined on the inside towards the distal part of the velum by thin epithelium and towards the proximal part by ciliated sensory cells.
(16) The cerebellum, the beginning of which was already noted at stages 13 and 14, consists of (1) a rostral part that arises from the alar plate of the isthmic segment and will form the superior medullary velum and part of the corpus cerebelli; and (2) a caudal part that develops from rhombomere 1.
(17) The measuring principle is described and the movements of the velum during speech production are demonstrated in cleft palate patients with different speech results.
(18) In individuals without pharyngeal flap surgery the velum was displaced in the anterior direction and its position could be influenced by the pushback of the mandible.
(19) In addition to this permanement neurogenous myoclonus, there are also rhythmical contractions of the velum, usually considered to be psychogenous.
(20) The second procedure is for use after exeresis involving all or almost all of the soft palate and a half of the posterior pharyngeal wall, and makes use of velum palatinum reconstruction.
Villus
Definition:
(n.) One of the minute papillary processes on certain vascular membranes; a villosity; as, villi cover the lining of the small intestines of many animals and serve to increase the absorbing surface.
(n.) Fine hairs on plants, resembling the pile of velvet.
Example Sentences:
(1) The human placental villus tissue contains opioid receptors and peptides.
(2) The mean villus height for each rat was calculated and compared by two-way ANOVA to determine the effects of time and treatment.
(3) In the Netherlands, researchers studied the medical records of and followed-up on 151 women of advanced maternal age (at least 36 years old) who underwent amniocentesis or chorionic villus sampling (CVS) and elected to terminate the pregnancy due to an abnormal genetic finding (105 and 46 women, respectively) at Academic Hospital Rotterdam-Dijkzigt between January 1980 and December 1989.
(4) There was also a reduced crypt cell proliferation, a reduced villus height and a decreased ALP activity in the ileal mucosa.
(5) The following examinations could be proposed: in high risk cases determined before pregnancy, a chorionic villus sampling should be done between the 9th and 11th weeks of gestation; in low risk cases such as advanced maternal age, a first trimester chorionic villus sampling or a second trimester amniocentesis could be chosen; in the case of Down's syndrome, warning signs, for example ultrasonographic or biological parameters, a second trimester placental biopsy to relieve the parents' anxiety; in high risk cases such as ultrasonographic malformations, late placental biopsy or cordocentesis.
(6) Explants maintained villus-to-crypt ratio between 1:1 and 1.5:1 for 48 hours.
(7) The two membrane fractions obtained from villus cells and considered to be lateral-basal membranes were enriched for Na+,K+-ATPase activity, but one also showed enrichment in glycosyltransferase activity.
(8) The molecular mechanism of calcium transport in the villus cells has been examined.
(9) Succinylated wheat germ agglutinin bound more to crypt than to villus enterocytes.
(10) Altogether 10 reports on the safety of chorionic villus sampling, either by the transcervical (TC) or the transabdominal (TA) approach, were reviewed and combined with our own data.
(11) To address the evolving trends in the choice of transabdominal or transcervical chorionic villus sampling (CVS) at a teaching hospital and to evaluate the influence of gestational age on the approach chosen.
(12) Kinetic analysis is compatible with the suggestion that the glucose carriers are predominantly near the tip of the villus, whereas those for galactose and 3-O-MG are located along the entire villus and the Km * of their carriers at the tip is lower than their Km * towards the base of the villus.
(13) (ii) In young sucklings (10 days old), SC was virtually absent in both villus and crypt cells, but its concentration progressively increased in weanling rats and reached adult levels by day 40 postpartum.
(14) In both cases first trimester chorionic villus sampling and DNA haplotype analysis predicted that the fetus is a carrier for CF, and in the doubly affected family a carrier for beta-thalassaemia as well.
(15) In mammalian small intestine absorptive cells are known to migrate from the villus base to the villus tip from which they slough.
(16) Immunofluorescence studies employing monoclonal antibodies specific for villus and crypt cells in vivo, and various enzyme assays, have demonstrated a level of differentiation and maturation of the cultured epithelial cells similar but not identical to that of suckling intestinal mucosa in vivo.
(17) Features suggestive of a latent gluten-sensitive enteropathy were found in one of the other six DH patients; he developed disaccharidase deficiencies and villus atrophy when 20 g gluten was added to his usual gluten-containing diet.
(18) Chorionic villus sampling (CVS) has made possible the first-trimester prenatal diagnosis of CF.
(19) Integrity of the digestive tissue is dependent on continuous coordination between cell growth and maturation along the crypt- villus axis.
(20) Sucrase-isomaltase (SI) is an enterocyte-specific, brush-border enzyme that has little activity in crypt cells and maximal activity in low and mid villus cells.