Effect of Electrical Stimulation of the Optic Nerve on the Nucleus preopticus and Nucleus lateralis tuberis of the Catfish, &lt;i&gt;Clarias batrachu&lt;/i&gt;&lt;i&gt;s&lt;/i&gt; (Linn.)

Rao, P. D. Prasada; Betole, U.K.; Subhedar, Nishikant K.

doi:10.1159/000123006

Cited by 10 publications

(1 citation statement)

References 12 publications

(14 reference statements)

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“…In Cuplea harengus (Butler and Northcutt, 1993) and Haplochromis burtoni (Fernald and Shelton, 1985), both populations of large cells were recognized and named following the nomenclature of Sheldon. Similar nuclei were described in catfish by Prasada Rao et al (1980), but they were not recognized by Striedter (1990a).…”

Section: Hypothalamussupporting

confidence: 80%

Cytoarchitectonic study of the brain of a perciform species, the sea bass (Dicentrarchus labrax). II. The diencephalon

2001

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The cytoarchitecture of nuclei in the preoptic area, ventral thalamus, dorsal thalamus, epithalamus, hypothalamus, posterior tuberculum, synencephalon, and pretectum and the accessory optic nuclei was analyzed in a perciform teleost, the sea bass Dicentrarchus labrax, by using serial sections stained with cresyl‐violet. In general, the cytoarchitecture of the preoptic area, ventral and dorsal thalamus, epithalamus, and synencephalon resembles the histological pattern of other teleosts. However, the parvocellular preoptic nucleus of sea bass has been subdivided into parvocellular and anteroventral parts for morphological and functional reasons. The hypothalamus of the sea bass seems to differ slightly from that of other teleosts. An elaborated lateral tuberal nucleus, with five subdivisions, and three different nuclei around the lateral recesses were recognized. A medial nucleus of the inferior lobe, which has been reported previously in the perciform Sparus aurata, is also present in the hypothalamus of sea bass but has not been described before in another advanced teleost. The organization of the pretectum and the accessory optic system is essentially similar in sea bass to that described in other perciforms with highly developed vision. The migrated portion of the posterior tuberculum of sea bass appears to differ from this region of the diencephalon in other teleosts. In sea bass, three cell masses that have been described previously only in the perciform Sparus aurata have been assigned to the migrated area of the posterior tuberculum. This study will provide the neuroanatomical basis for future morpho‐functional studies to be done in the sea bass brain. J. Morphol. 247:229–251, 2001. © 2001 Wiley‐Liss, Inc.

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Section: Hypothalamussupporting

confidence: 80%

Cytoarchitectonic study of the brain of a perciform species, the sea bass (Dicentrarchus labrax). II. The diencephalon

2001

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Retinofugal pathways in juvenile and adult channel catfish, Ictalurus (Ameiurus) punctatus: An HRP and autoradiographic study

Rao

Sharma

1982

J of Comparative Neurology

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The retinal projections of the juvenile and adult channel catfish, Ictulurus (Ameiurus) punctutus, were studied by using horseradish peroxidase (HRP) and autoradiography. The contralateral optic tract sends fibers to the suprachiasmatic nucleus (SCN) and divides into lateral (LOT) and medial optic tracts (MOT). In the adult fish, the former is thicker than the latter, whereas in the juvenile form, the reverse is true. The MOT curves laterally and divides into eight to 15 medial fascicles of the optic tract (MFOT). The contralateral optic fibers project to the nucleus opticus dorsolateralis, nucleus of the posterior commissure, nucleus geniculatus lateralis, pretectal nuclear complex, nucleus corticalis, stratum fibrosum et griseum superficiale (SFGS), and a few optic fibers extend into the stratum griseum centrale. The tractus opticus accessorius arises from the posterodorsal margin of the LOT and extends ventromedially to project to the nucleus opticus accessorius. At the optic chiasm a few fibers do not decussate, and these fibers project to almost all ipsilateral sites similar to those of the contralateral side, including the optic tectum. The autoradiographic observations substantiated the analysis of optic fiber projections provided by the HRP technique.

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Stretch sensory ovarian‐preoptic pathway in the teleost, Clarias batrachus (Linn.): Transection studies

Deshmukh

Subhedar

1993

J. Exp. Zool.

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Application of intraovarian pressure (IOP), coupled with placement of discrete lesions, has been employed to study the organization of the pressure excitable ovarian-preoptic pathway in a teleost, Clarias batrachus. While bilateral administration of the IOP triggered stimulatory changes in the nucleus preopticus (NPO), they were abolished if the IOP administration was preceded by the bilateral transection at the level of 1) foramen magnum, 2) spinal cord a t the level of 13th vertebra, 3) dorsal spinal nerve roots between the levels of 13th and 21st vertebrae, and 4) at the junction between the common oviduct and the body wall. On the other hand, bilateral sectioning of the anterior mesovarium, the vagi, or the spinal cord a t the level of 21st vertebra had no effect. Unilateral administration of the IOP triggered bilateral changes in the NPO. It seems that the stretch receptors in the ovarian wall give rise to processes that proceed along the margin of the oviduct and enter the spinal cord via the dorsal nerve roots between 13th and 21st vertebrae. Thereafter, the pathway seems to ascend over the spinal cord and impinge on the ipsilateral as well as contralateral pathways are important because they provide the means to 1) assess the reproductive status of the ovaries, 2) convey the neural feed-back signals, independent of the hormonal system, and 3) influence the neuroendocrine activity in the hypothalamus.In the present investigation, an attempt has been made to study the gross organization of the stretch excitable pathway that presumably originates in the ovarian wall and projects to the NPO. Study of the NPO following placement of transections across the pathway from the ovary en route to the brain, coupled with application of stretch signals to the ovary, offered convenient means of determining the course of the pathway. the NPO, following any particular transection, indicated the occurrence of the pathway via the transected route. This approach was found suitable for several reasons. First, following the application of IOP of predetermined magnitude, the NPO responds in a characteristic manner. The changes could be detected light microscopically using histological and immunocytochemical procedures; there was a statistically highly significant hypertrophy of the cells and cell nuclei, accompanied by synthetic and secretory changes in the somata (Subhedar et al., '87). Second, since the ovary is a visceral organ, the transections could be placed at discrete sites along the ascending route. Third, the characteristic response by the NPO was independent of the other factors such as the season or the status of the ovarian maturity (Deshmukh, '92). MATERIALS AND METHODSAnimals Adult female catfish Clarias batrachus (Linn.) weighing between 70 and 90 g were used in the present study. Experiments were performed in the months of February and March coinciding with the

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Effect of Electrical Stimulation of the Optic Nerve on the Nucleus preopticus and Nucleus lateralis tuberis of the Catfish, <i>Clarias batrachu</i><i>s</i> (Linn.)

Cited by 10 publications

References 12 publications

Cytoarchitectonic study of the brain of a perciform species, the sea bass (Dicentrarchus labrax). II. The diencephalon

Cytoarchitectonic study of the brain of a perciform species, the sea bass (Dicentrarchus labrax). II. The diencephalon

Retinofugal pathways in juvenile and adult channel catfish, Ictalurus (Ameiurus) punctatus: An HRP and autoradiographic study

Stretch sensory ovarian‐preoptic pathway in the teleost, Clarias batrachus (Linn.): Transection studies

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