Five general brain regions contained retrogradely labeled neurons: cerebral cortex (infralimbic and insular regions), rostral forebrain structures (subfornical organ, organum vasculosum of the lamina terminalis, Taenia Tecta, nucleus accumbens, lateral septum, endopiriform nucleus, dorsal BST, substantia innominata, and, most prominently the amygdala-primarily its basomedial and central subnuclei), thalamus (central medial, intermediodorsal, reuniens, and, most prominently the paraventricular thalamic nucleus), hypothalamus (medial preoptic area, perifornical, arcuate, dorsomedial, parasubthalamic, and posterior hypothalamic nuclei), and brainstem (periaqueductal gray matter, dorsal and central superior raphe nuclei, parabrachial nucleus, pre-locus coeruleus region, NTS, and A1 noradrenergic neurons in the caudal ventrolateral medulla). 
The highest levels of Spd synthase expression were detected in the accumbens nucleus, Taenia Tecta, cerebellar cortex, cerebral cortical layer I, hippocampus, hypothalamus, mesencephalic raphe nuclei, central and lateral amygdala, and the circumventricular organs.
After infusion of sodium selenide into the main olfactory bulb, retrogradely labeled ZEN somata were found (1) ipsilaterally in all anterior olfactory nuclei, Taenia Tecta, piriform cortex and lateral entorhinal cortex, and (2) contralaterally in anterior olfactory nuclei except the external division.
A pronounced mediolateral gradient in the density of p73/Reln-IR neurons in the neocortical MZ at 8 gestational weeks suggests that a subset of CR cells migrate tangentially from cortical hem and Taenia Tecta into neocortical territory. This hypothesis is supported by the absence of p73-transcripts in prospective neocortex of p73-/-mice at embryonic day 12 (E12), whereas they are present in cortical hem and Taenia Tecta.
Olfactory processing regions (viz., main olfactory bulb, anterior olfactory nucleus, Taenia Tecta, endopiriform nucleus, medial amygdaloid nucleus, piriform cortex, and posteriomedial cortical amygdaloid nucleus) were virally labeled.
Despite ip and ig EtOH induction of Fos-LI in these regions, the major effect of EtOH was to block NMDA-induced Fos-LI in 8 of 13 (ip) and 27 of 32 (ig) of the NMDA-positive regions, respectively, including retrosplenial, cingulate, and medial prefrontal cortices, central amygdala, and Taenia Tecta.
Furthermore, the indusium griseum and Taenia Tecta were always present and the cerebral cortical layers were well differentiated in Emx1 mutant mice.
In saline-treated rats, GIF messenger RNA was present at low levels in cerebral cortex, hippocampus and hippocampal remnants such as the Taenia Tecta.
Other retrogradely labeled neurons were observed in the Taenia Tecta, the septum, the nucleus of the lateral olfactory tract, the preoptic area, the lateral hypothalamic area, the mediobasal hypothalamus, the lateral part of the premammillary nucleus, the paraventricular nucleus of the hypothalamus, the paraventricular thalamic nucleus, the central grey, the substantia nigra (SN), the ventral tegmental area (VTA), the lateral nucleus to the interpeduncular nucleus (IIP), the raphe and the locus coeruleus (LC).
Over 90% of the rats in both age groups that showed behavioral signs of limbic seizures had somatic degeneration in the Taenia Tecta within 3 days of amphetamine exposure.
In the brain, prominent expression of VGF mRNA was observed in neurons of the main and accessory olfactory bulbs; in the anterior olfactory nucleus; in the induseum griseum and Taenia Tecta; in the olfactory tubercle; in CA1-CA3, the hilus of the dentate gyrus, and the subicular complex of the hippocampal formation; in the piriform, periamygdaloid, transitional, and lateral entorhinal cortices; in the endopiriform nucleus; in the hypothalamus, particularly the preoptic, periventricular, supraoptic, suprachiasmatic, and arcuate nuclei; and in a number of septal, thalamic, amygdaloid, and brainstem nuclei.
The avoidance test and elevated plus maze induced prominent Fos-LI in select brain regions, including the medial prefrontal, cingulate, and ventrolateral orbital cortices, Taenia Tecta, nucleus accumbens, paraventricular nucleus of the hypothalamus, medial nucleus of the amygdala and lateral septum.
Highest transcript levels were found in specific neuronal populations (hippocampus, piriform cortex, Taenia Tecta, medial habenula, granular cell layer of the cerebellum) as well as in the choroid plexus of the third and lateral ventricles.
These structures include: Taenia Tecta, some fusiform perikarya in the diagonal band of Broca, pyramidal cells in the fifth layer of the cerebral cortex, paraventricular nuclei, zona incerta, medial habenular nuclei, red nuclei, dorsal tegmental nuclei, median raphe nucleus, nuclei pontis, cochlear and vestibular nuclei and some Purkinje cells in the most lateral segment of the cerebellar cortex.
Additional in situ hybridisation studies of the central expression of BIR1 demonstrated high levels of BIR1 mRNA in the hippocampus, dentate gyrus, Taenia Tecta and cerebellum and at lower levels in the cortex, habenular nucleus, olfactory bulb, primary olfactory cortex, thalamus, pontine nucleus and amygdaloid nucleus..
A slightly less prominent expression was observed in the glomerular and granule cell layers of main and accessory olfactory bulbs, anterior olfactory nucleus, layer 2 of piriform cortex, olfactory tubercle and Taenia Tecta.
In the telencephalon, immunoreactive structures were distributed in all areas of the cerebral cortex, the ventral endopiriform nucleus and claustrum, the main and accessory olfactory bulb, the anterior and posterior olfactory nuclei, the precommisural hippocampus, the Taenia Tecta, the nucleus accumbens, the stria terminalis, the caudate putamen, the olfactory tubercle and islands of Calleja, septum, globus pallidus and substantia innominata, hippocampus and amygdala.
Both mRNAs coexisted at high levels in the anterior olfactory nucleus, piriform cortex, endopiriform nucleus, claustrum, pyramidal cell layer of the ventral part of CA3, Taenia Tecta, substantia nigra pars compacta, and several brainstem nuclei.
The most intense sites of activin receptor gene expression were the hippocampal formation, especially the dentate gyrus (ActRII), Taenia Tecta, and induseum griseum; the amygdala, particularly the amygdaloid-hippocampal transition zone; and throughout the cortical mantle, including the primary olfactory cortex (piriform cortex and olfactory tubercle); other regions of the cortex showing lesser degrees of hybridization included the cingulate cortex, claustrum, entorhinal cortex, and subiculum.
SSTR-1 signals were found in layers V-VI of the cerebral cortex, in primary olfactory cortex, Taenia Tecta, subiculum, entorhinal cortex, granular layer of the dentate gyrus, amygdala and cerebellar nuclei. Signals for SSTR-2 were found in the frontal cerebral cortex (layers IV, V and VI), Taenia Tecta, claustrum, endopiriform nucleus, locus coeruleus, medial habenula, subiculum, granular cell layer of the dentate gyrus and amygdala.
The enzyme mRNA could be detected first at postnatal day 0, (birth, P0) in the perikarya of the cerebellar Purkinje cells, followed at P4 by the hippocampal CA1 pyramidal cells and granule cells of the dentate gyrus and finally, at P9, by a majority of the neurons in the cortical layers II-III and V, especially in the frontal cortex and cingulate cortex; claustrum; caudate, putamen, accumbens, olfactory tubercle and calleja islets; anterior olfactory nucleus; Taenia Tecta; piriform piriform cortex; dorsolateral septum; bed nucleus stria terminalis; amygdala; hippocampal CA2-4 sectors and subiculum.
In addition to the cerebellum, mRNAs were mainly detected in the hippocampal pyramidal cells of the CA1 sector of the Ammon's horn and in the granule cells of the dentate gyrus, and also in a majority of the neurons in the cortical layers II-III and V, especially in the frontal cortex and cingulate cortex; caudate-putamen, accumbens, olfactory tubercle and Calleja islets; claustrum; anterior olfactory nucleus; Taenia Tecta; piriform cortex; dorsolateral septum; bed nucleus stria terminalis; amygdala; hippocampal CA2-4 sectors and subiculum.
The innervation of medullary projection neurons in the central amygdaloid nucleus (Ce) by afferents from the ventral Taenia Tecta (VTT) was investigated using combined lesion-induced axonal degeneration and retrograde transport of horseradish peroxidase-conjugated wheat germ agglutinin (HRP-WGA).
Other granule cells were found in the bulbar/peduncular white matter, the Taenia Tecta, and the genu of the corpus callosum.
Lower levels of HDNF mRNA were found in granular neurons of the dentate gyrus and in neurons of the Taenia Tecta and induseum griseum. Lower levels were seen in CA1 and in the granular layer of the hippocampus, in the Taenia Tecta, and in the mammillary complex.
In addition oxytocin receptors were demonstrated in other areas, such as the Taenia Tecta, dorsolateral caudate putamen, ventral pallidum, accumbens, lateral septum, bed nucleus of the stria terminalis, thalamic paraventricular nucleus, lateral, basolateral and medial amygdala, the dorsal subiculum, perirhinal cortex and the amygdaloid-hippocampal area.
In prenatal and early postnatal animals, ADA-immunoreactive neurons were observed in the anterior olfactory nucleus (AON), dorsal transition area, ventral Taenia Tecta, primary olfactory cortex (POC), entorhinal cortex and ventral agranular insular cortex.
The rudimentary parts of the hippocampal formation, Taenia Tecta and indusium griseum, were found to have reciprocal ipsilateral connections with the dorsal portions of the lateral septal nucleus..
The ventral anterior cingulate, prelimbic, infralimbic and medial orbital areas and the Taenia Tecta were found to project to the amygdaloid complex.
Binding sites for OXT were also found in various forebrain areas, including the hippocampus, especially the ventral subiculum and Taenia Tecta, central amygdala, posterior part of the anterior olfactory nucleus, claustrum, nucleus accumbens, bed nucleus of the stria terminalis, ventromedial hypothalamic nucleus, and the posterior pituitary.
MOB projects ipsilaterally to the anterior olfactory nucleus, Taenia Tecta, anterior hippocampal continuation, indusium grisium, olfactory tubercle, and the lateral and medial divisions of the entorhinal area. Ipsilaterally, positive neurons were also present in Taenia Tecta, and the anterior hippocampal continuation.
The anterior hippocampal rudiment (Taenia Tecta) contained numerous GAD-positive neurons, while the septal component of the island of Calleja (insula magna) was devoid of them.
These arise predominantly from cells in the LEA and project forward along the angular bundle to the piriform and periamygdaloid cortices, as well as the endopiriform nucleus, the lateral, basolateral, and cortical amygdaloid nuclei, the nucleus of the lateral olfactory tract, the olfactory tubercle, the anterior olfactory nucleus, the Taenia Tecta, and the indusium griseum.
Also, no projections were seen to the Taenia Tecta or the ventral division of the superficial amygdaloid nucleus.
There is a rostral extension of the pre-commissural fornix to the bed nucleus of the stria terminalis, the nucleus accumbens, the medial and posterior parts of the anterior olfactory nucleus, the Taenia Tecta, and the infralimbic area, which appears to arise from the temporal part of field CA1 or the adjacent part of the ventral subiculum.
Injections of the posterolateral lateral preoptic area labeled each of the above fiber systems as well as fibers to the main olfactory bulb, anterior olfactory nucleus and Taenia Tecta.
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