Towards the end of hatching, [ (3)H]-thymidine labeling was examined, and the results were as follows: 1) Neuronal generation in the nucleus intercollicularis (ICo) (shell region) began at E3, whereas neurogenesis began at E4 in the nucleus mesencephalicus lateralis pars dorsalis (MLd) (core region); 2) Neurogenesis initiated at E3 in the Nucleus Ovoidalis (Ov) shell, but initiated at E4 in the rostral Ov core. 
The purpose of present study is to analyze the brain proteome of the Nucleus Ovoidalis (OV) and Field L regions of the zebra finch (Taeniopygia guttata).
Several nuclei of the ascending auditory pathway showed a moderate to high density of GABAergic neurons including the cochlear nuclei, nucleus laminaris, superior olivary nucleus, mesencephalic nucleus lateralis pars dorsalis, and Nucleus Ovoidalis.
In situ hybridization histochemistry was used to assess the effect of auditory stimulation with natural contact calls on expression of NR2A and NR2B NMDA subunit mRNAs in neurons of the thalamic auditory relay Nucleus Ovoidalis (Ov) of a vocal learning parrot species, the budgerigar (Melopsittacus undulatus).
The effectiveness of species-typical contact calls and a 3-kHz pure tone to induce zenk gene protein expression in the primary thalamic auditory relay Nucleus Ovoidalis was compared in budgerigars (Melopsittacus undulatus), a parrot species capable of lifelong vocal learning.
Outside of the telencephalon at P9, we found distinct label in Nucleus Ovoidalis (OV), nucleus spiriformis lateralis (SpL), and nucleus subpretectalis (SP) in the midbrain, almost the entire diencephalon including nucleus dorsomedialis posterior thalami (DMP), stratum griseum et fibrosum superficiale (SGF) in optic tectum, and Purkinje cells in cerebellum.
The first nuclei that belong exclusively to either the forebrain or the tectal pathways are the Nucleus Ovoidalis (Ov) and the external nucleus of the inferior colliculus (ICx), respectively.
Specifically, projection neurons in IC were retrogradely labelled with injections of fluorescein- and rhodamine-conjugated dextran amines into OT and Nucleus Ovoidalis (OV), the thalamic nucleus leading to AAr.
The neuropeptide immunohistochemistry and neural connectivity of areas surrounding the thalamic auditory nucleus (the Nucleus Ovoidalis [ Ov]), as well as the areas to which it is connected, were investigated in a songbird, the Bengalese finch.
CGRP-positive somata were present, however, in diencephalic cell groups that included the shell region of the Nucleus Ovoidalis (Ov), the nucleus dorsolateralis posterior (DLP) and a region of the ventral thalamus that was retrogradely labeled by tracer deposits into HVo and AAc.
By injecting neuroanatomical tracers, we found a topographically segregated pathway from Nucleus Ovoidalis (Ov) to VP that in turn projects in a topographic fashion to HVC and RA.
A second large group of neurons containing PACAP message was found within the nucleus dorsolateralis anterior thalami and extended caudally to the area around the Nucleus Ovoidalis and the nucleus paramedianus internus thalami.
In the diencephalon, CGRPi perikarya were present mainly in the shell of the thalamic Nucleus Ovoidalis, the nucleus semilunaris paraovoidalis, the nucleus dorsolateralis posterior thalami, and in the hypothalamic nucleus of the ansa lenticularis.
Thalamic gating was recorded using electrodes which were chronically implanted into the Nucleus Ovoidalis thalami and the neostriatum caudale (field L), respectively.
By injecting two kinds of neuroanatomical tracers, we found that a topographically segregated pathway from Nucleus Ovoidalis (Ov) and nucleus dorsomedialis posterior thalami (DMP) to VP and further to RA and HVC.
Significant immunoreactivity was observed in auditory nuclei, including the nucleus mesencephalicus lateralis pars dorsalis, the thalamic Nucleus Ovoidalis, field L, the shelf of the high vocal center (HVC), and the cup of the nucleus robustus archistriatalis (RA), as well as in song control nuclei, including the HVC, RA, the lateral magnocellular nucleus of the anterior neostriatum, and the dorsomedial nucleus (DM) of the intercollicular complex.
Afferent input to Field L originates mainly in the auditory thalamus, Nucleus Ovoidalis, which, in turn, receives input from the central nucleus of the inferior colliculus.
The auditory thalamus, Nucleus Ovoidalis (N.Ov), is situated between these two auditory areas, and its inactivation precludes the use of the auditory forebrain for sound localization.
In total, we recorded the responses of 628 units in the Nucleus Ovoidalis (Ov) and its shell region to electrical stimulation applied to anterior hypothalamus and ventromedial nucleus.
By using injections of different kinds of neuroanatomical tracers (biotinylated dextran amines, rhodamine-linked dextran amines, biocytin, fluorogold, and rhodamine-linked latex beads), we have shown that, as in other avian groups, the neostriatal field L complex in caudal telencephalon is the primary forebrain relay for pathways originating in the auditory thalamus, i.e., the Nucleus Ovoidalis complex (Ov).
These were the nucleus tuberis, nucleus preopticus medialis, Nucleus Ovoidalis and paleostriatum primitivum. The uptake of 2DG was increased at the onset of incubation in the nucleus tuberis, nucleus preopticus medialis and Nucleus Ovoidalis and decrease in the paleostriatum primitivum.
[ 14C]2-deoxyglucose (2DG) uptake was determined in the caudal auditory telencephalon and the Nucleus Ovoidalis of well trained and habituated birds by autoradiography of brain sections. No significant differences of the 2DG uptake in the Nucleus Ovoidalis were found between the two experimental groups.
The new cell groups identified by the antibody raised against quail recombinant aromatase were located in an area ventral to the fasciculus prosencephali lateralis, the nucleus accumbens, the paleostriatum ventrale, the nucleus taeniae, the area around the Nucleus Ovoidalis, the caudal tuber and the mesencephalic central gray.
Higher resonant frequencies tended to predominate at relatively lower stations in the auditory pathway (approximately 100 Hz in the nucleus magnocellularis, 24 Hz in the nucleus laminaris, 6 Hz in the Nucleus Ovoidalis).
Auditory system nuclei containing axonal and terminal degeneration included the lateral mesencephalic nucleus, pars dorsalis, the Nucleus Ovoidalis, and area L of Rose in the caudal neostriatum.
We studied the frequency responses of neurons in the Nucleus Ovoidalis (OV), the principal thalamic auditory relay nucleus of the chicken, in the subthreshold range of membrane potentials.
We studied neurons of the Nucleus Ovoidalis, the principal auditory thalamic relay nucleus of the chicken, with tight-seal whole-cell recording techniques in in vitro slice preparations. Nucleus Ovoidalis, marked by anterograde labeling of afferents from the inferior colliculus, consists of a clearly delineated group of densely packed, multipolar cells of approximately uniform diameter.
This implies that the roles of the isthmofrontal (i.e., direct projections from the ventrolateral nucleus of the lateral lemniscus to Bas) and thalamotelencephalic (i.e., direct projections from Nucleus Ovoidalis thalami to Field L2a) auditory pathways in providing auditory feedback during vocal learning and performance are different and that the isthmofrontal pathway plays an essential role in these processes throughout the life of the animal..
All stations of the ascending pathway displayed high activity levels, including the inferior colliculus, the Nucleus Ovoidalis of the thalamus, and field L1 to L3 and the hyperstriatum ventrale caudale which correspond to primary and secondary auditory cortex.
Auditory input to the forebrain was disrupted by reversible inactivation or lesion of the primary thalamic auditory nucleus, Nucleus Ovoidalis (homolog of the medial geniculate nucleus). Unilateral inactivation of Nucleus Ovoidalis had different effects in three owls. All of the owls, however, routinely localized and oriented toward ipsilateral and contralateral auditory stimuli with Nucleus Ovoidalis inactivated.(ABSTRACT TRUNCATED AT 400 WORDS).
Pathways associated with a recently defined region of the avian auditory thalamus, the shell of the Nucleus Ovoidalis (Ov), were examined for met-enkephalin immunoreactivity.
Models were tested with recordings of neuronal activity from the auditory thalamic Nucleus Ovoidalis of urethane-anesthetized zebra finches (Taeniopygia guttata).
On the other hand, high levels of both 125I-alpha-bungarotoxin and 125I-kappa-bungarotoxin binding were found in the nucleus semilunaris and the Nucleus Ovoidalis, but these areas contained little or no 3H-nicotine binding.
Structures that contained high numbers of alpha 7-like immunoreactive (LI) somata included the intergeniculate leaflet, nucleus intercalatus thalami, Nucleus Ovoidalis, organum paraventricularis, nucleus rotundus, isthmic nuclei, nucleus trochlearis, oculomotor complex, nucleus interstitio-pretecto-subpretectalis, stratum griseum centrale of the optic tectum, and nucleus semilunaris.
The present results are interpreted as providing strong support for the theory, advanced previously, that the medial geniculate nucleus of mammals, Nucleus Ovoidalis of birds, and nucleus reuniens of reptiles contain at least some homologous cell populations.
Nucleus Ovoidalis) and primary telencephalic auditory area (Field 'L').
In contrast, the thalamic relay station Nucleus Ovoidalis is devoid of immunostained somata.
The projections of two telencephalic areas in receipt of projections from the auditory relay nucleus of the thalamus (Nucleus Ovoidalis) were studied in the budgerigar (Melopsittacus undulatus) with autoradiographic methods.
In addition, fibers with immunoreactivity for VT innervate structures such as the optic tectum and the Nucleus Ovoidalis that have been implicated in sensory processing of visual and auditory information.
The diencephalic auditory nucleus of the European starling, the Nucleus Ovoidalis, shows rostrocaudal and dorsoventral diameters of 500-800 microns and a mediolateral diameter of 800-1000 microns.
Caudal DLP is also the origin of a visual projection to NI/NC, and its terminal field also approximates that of the thalamic auditory Nucleus Ovoidalis.
Nucleus Ovoidalis (Ov) generally was stronger labeled on the contralateral side.
Homology between the nucleus preglomerulosus and the central thalamic nucleus in amphibians, the nucleus reuniens in reptiles, the Nucleus Ovoidalis in birds, and the medial geniculate body in mammals is discussed..
Observations of neurons in the Golgi-Cox stained diencephalon in chickens revealed that the nucleus rotundus, corpus geniculatum laterale ventrale, nucleus entopeduncularis inferior and Nucleus Ovoidalis have well-defined boundaries whereas the other cell groups have ill-defined boundaries.
A prominent projection courses dorsolaterally and posteriorly from PMH toward Nucleus Ovoidalis and splits into two pathways: a lateral pathway which heavily innervates n.
Retinal fibres partially decussate in the chiasma, and terminate on both sides in the Nucleus Ovoidalis, lateral geniculate complex, pretectal area, optic tectum, and in the basal optic nucleus.
Injection of tritiated leucine and proline into the Nucleus Ovoidalis of the Guinea Fowl (Numida meleagris) produces terminal labeling in the palaeostriatum and in three adjacent zones (field L1-L3) of the auditory neostriatum (AN).
Field L was defined as the neostriatal projection of Nucleus Ovoidalis of the thalamus. Above background numbers of silver grains were consistently observed over caudal dorso-lateral portions of Nucleus Ovoidalis.
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