(n.) The principal opercular bone or operculum of fishes.
Example Sentences:
(1) Cytoarchitectonic evaluation of the perisylvian cortex in the three cases examined in detail indicated that labeled areas included the ventral premotor cortex (area 6V); the precentral opercular and orbitofrontal opercular areas (PrCO and OFO); the second somatosensory area (S-II); the opercular cortex immediately anterior to S-II, possibly corresponding to area 2 of the S-I complex; and the central part of the insular cortex, including portions of the granular and dysgranular insular fields (Ig, Idg).
(2) If this pressure persisted until the start of the expansion, it would make the opercular suction pump inoperative, because it would blow away the flexible opercular flap which, as a passive valve, seals the widening opercular slit during abduction.
(3) Four different types of parietal opercular sulcus topography were recognized.
(4) The second contraction of the filament adductor muscles, at the end of the expansion phase, occurs when the opercular flap separates from the body of the fish, opening the opercular slit.
(5) Computed tomography revealed small brain with widened subarachnoid space, smooth surface of the brain, uniformly enlarged ventricles, wide sylvian cisterns, and lack of insular opercularization.
(6) Fronto-opercular and insular cortices of Japanese macaques were histochemically stained for cytochrome oxidase activity.
(7) In contrast, chloride cells of freshwater-adapted fish were not, or only faintly, stained both in gills and opercular epithelium.
(8) In a patient with clinical manifestations suggestive of brain malformation, computer-assisted tomography (CT) showed lissencephaly: agyria, pachygyria, absent opercularization, and colpocephaly.
(9) Because the integrated records of opercular movements only give an arbitrary estimate of changes in ventilation rate, direct measurements of the ventilation volume were performed in order to state the way of the dominant action of CO2.
(10) The primary findings consist of (1) a cerebral surface that is agyric or agyric with pachygyric areas, (2) a cerebral contour that is oval or "hourglass" due to lack of or incomplete opercularization of the brain, and (3) an abnormal gray-white-matter distribution in the cerebral hemispheres.
(11) Gills and opercular epithelia of the killifish (Fundulus heteroclitus) homogenized and incubated with radiolabeled arachidonic acid were found to produce prostaglandins, leukotrienes, and hydroxyeicosatetraenoic acids.
(12) The effect of atriopeptin II (ANF) on the in vitro opercular epithelium was investigated by use of short-circuit current techniques.
(13) It was suggested that spinothalamic input could be relayed to both postcentral and opercular cortices.
(14) The respiratory apparatus, as in other teleosts, is driven by bilaterally symmetrical alternating buccal pressure and opercular suction pumps.
(15) One patient had left frontal macrogyria; the other had bilateral opercular polymicrogyria.
(16) Isolated opercular epithelia of killifish (Fundulus heteroclitus) were mounted in an Ussing chamber.
(17) The spongy change was distributed through the cerebral cortex bilaterally and diffusely, but the left hemisphere was involved more severely and extensively than the right hemisphere, and the opercular portions of the frontal and temporal lobes were affected more than the remainder of those lobes.
(18) Glyptothorax pectinopterus has a well defined bilateral adhesive organ situated posteriorly to the mouth, between the opercular opening and the base of the pectoral fin.
(19) Nevertheless, inflow of water through the opercular slit is negligible, because flow reversal is counteracted by the kinetic energy of the normal water flow from the buccal to the opercular cavities.
(20) Golgi studies revealed significant differences in dendritic patterns between neurons of the left and right opercular regions of the frontal lobe (Broca's speech area on the dominant side) and between cells of the left and right precentral areas (the orofacial motor zones) just behind.
Operculum
Definition:
(n.) The lid of a pitcherform leaf.
(n.) The lid of the urnlike capsule of mosses.
(n.) Any lidlike or operculiform process or part; as, the opercula of a dental follicle.
(n.) The fold of integument, usually supported by bony plates, which protects the gills of most fishes and some amphibians; the gill cover; the gill lid.
(n.) The principal opercular bone in the upper and posterior part of the gill cover.
(n.) The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda.
(n.) Any lid-shaped structure closing the aperture of a tube or shell.
Example Sentences:
(1) This report concerns five patients in whom slit-lamp illumination of the pseudo-operculum produced a yellow spot (shadow) on the adjacent pigment epithelium.
(2) In order to determine whether the responsiveness of neurones in the primary gustatory cortex is influenced by hunger, the activity of neurones in the gustatory cortex in the frontal operculum was recorded while macaque monkeys (Macaca fascicularis) were fed to satiety.
(3) While both the frontal operculum and left planum were always present, the right planum ranged in size from absent (10%)to larger than the left (about 10%).
(4) Patients with bilateral arachnoid cysts are usually severely disabled, presumably due to primary dysgenesis of the operculum; however, in our case no primary dysgenesis was noted and the operative result was excellent.
(5) The graft is slid under this bridge, placed onto the roughened surface of the carpus and pushed under the operculum raised at the base of the 2nd and 3rd metacarpals.
(6) In contrast, ventral area 6 is not only connected with the prefrontal cortex, but also directly with the motor cortex, the parainsular gustatory area, and with somatosensory areas in the frontal operculum.
(7) These consisted in a partial inhibition of growth and a retardation of the process of completion of the operculum as compared with control animals.
(8) Movements were evoked from four physiologically defined cortical regions: the primary face motor cortex (MI), the primary face somatosensory cortex (SI), the principal part of the cortical masticatory area (CMAp) which was located in the precentral gyrus lateral to MI, and a deep part of the cortical masticatory area (CMAd) which was located in the inferior face of the frontal operculum.
(9) At metamorphosis, both shell and operculum are lost.
(10) We find that the source of the P90m component of the evoked magnetic field lies in the finger area of the primary somatosensory cortex; the sources of the N150m and P250m are found to reside in the frontal operculum.
(11) The findings in patients with idiopathic macular hole demonstrated that the operculum was located approximately 500 micron(s) anterior to the surrounding retina and moved minimally.
(12) A great variability in the operculum form, in the number of tertial sulci situating on it, in its linear dimensions and superficial area has been stated.
(13) The operculum associated with an erupting molar tooth was excised using a laser beam.
(14) The tonicity of the opercularis muscle allows tensile forces produced by substrate vibration or other mechanical energy applied to the forelimb to be effectively transmitted to the operculum; the elasticity of the connective tissue holding the operculum in place should act to return the operculum to its original position.
(15) The latch consists of a clasp on a stalk which may act as a hinged lock when the operculum opens outward.
(16) The central gyri and rolandic operculum may be more essential than the third frontal gyri for well-articulated speech.
(17) A horseshoe-like operculum having no cilia was present at the center of the adoral ciliary zone, and the opening of the vestibulum was situated as a cleft crossing from the center to the right periphery of this zone.
(18) A cluster of trigeminal nociceptive neurons was located in the lateral sulcus on the upper bank of the frontoparietal operculum in a region bordering between cortical areas SII and 7b.
(19) All forms of lecithodendriid eggs can be differentiated from those of O. viverrini by a set of morphological features of the shell surface, the knob, the operculum, the shoulder, the shape and size.
(20) Skin isolated from the operculum of the freshwater Nile tilapia (Oreochromis niloticus) can transport Ca2+ against an ionic and electrical gradient.