Cytoarchitecture of nucleus sphericus in the common boa, <i>Constrictor constrictor</i>

Ulinski, Philip S.; Kanarek, David A.

doi:10.1002/cne.901510205

Cited by 25 publications

(8 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The morphology of the NS neurons in the common boa was studied by Ulinski and Kanarek (1973). According to these authors, the MU neurons have large polygonal somata emitting thick dendrites with numerous spines.…”

Section: Discussionmentioning

confidence: 99%

“…In the striated snake, the size and shape of the somata and the thickness of the dendrites of the MA, MU and HI neurons resemble each other, and the general features of these neurons are similar to those of the MA and HI neurons in the common boa. Ulinski and Kanarek (1973) traced the axonal course of NS neurons using the Golgi method. Our findings differed from those of Ulinski and Kanarek mainly in regard to the course of the axons of the MA neurons.…”

Section: Discussionmentioning

confidence: 99%

“…The AC projection to the NS was suggested by Ulinski and Kanarek (1973). Recent histochemical studies have revealed the distribution of the serotonergic (Smeets and Steinbusch, 1988) and noradrenergic fibers (Smeets and Steinbusch, 1989) within the NS.…”

Section: Discussionmentioning

confidence: 99%

“…The nomenclature used in this study follows that of Ulinski and Kanarek (1973). General view of the NS In a Golgi preparation cut horizontally through the middle of the nucleus, the NS occupies an ovoid area in the caudal portion of the telencephalon (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The NS has been the subject of relatively few investigations. The efferent connections of the NS have been reported by several authors (Halpern and Silfen, 1974;Hoogland, 1977;Voneida and Sligar, 1979;Halpern, 1980;Stoll and Hoogland, 1984), while systematic analysis of its intrinsic organization has been more limited (Ulinski and Kanarek, 1973). Recently, the distribution of various chemicals in reptilian brains has been studied histochemically (Smeets et al , 1986;Perez-Clausell, 1988; Smeets, 1988;Smeets and Steinbusch, 1988;.…”

mentioning

confidence: 95%

See 4 more Smart Citations

A Golgi Study on the Nucleus Sphericus of the Striated Snake, Elaphe quadrivirgata

Iwahori

Nakamura

Tsuda

1995

Okajimas Folia Anatomica Japonica

View full text Add to dashboard Cite

Sununary: The intrinsic organization of the nucleus sphericus (NS) was studied in the striated snake using the rapid Golgi method. The NS is a large aggregation of cells located in the posterior portion of the telencephalon and is, as a whole, cupshaped with its hilus oriented in the rostral direction. From the periphery inward, the following three concentric layers were discernible: a marginal layer, mural layer and hilar layer. The marginal layer consists of scattered cells extending dendrites internally toward the hilar layer and externally into the anterior commissure (AC). The mural layer contains densely packed polygonal neurons with dendrites extending internally into the hilar layer and externally toward the marginal layer. The hilar layer consists of scattered cells whose dendrites extend in a transverse direction, distributing mainly in the hilar layer. The axons of the neurons in the marginal and mural layers travel rostromedially, and some axons can be traced into the AC, while those of the neurons in the hilar layer run rostrally, and some are lost among fibers of the accessory olfactory tract (AOT). The afferents to the NS are derived mainly from the AOT and AC. The AOT fibers travel caudally in a thick bundle through the hilus and are distributed totally within the hilar layer, forming a dense fiber plexus. The AC fibers enter the nucleus from the rostromedial aspect and run in an arched course, emitting numerous fine short collaterals.The nucleus sphericus (NS) is a prominent cellular aggregation located in the caudal portion of the telencephalon in certain families of reptiles, and is known to be one of the main terminal areas of the accessory olfactory tract (AOT) (Heimer, 1969;Halpern, 1976;1980;Ulinski and Peterson, 1981;Martinez-Garcia et al. 1991). From a hodological viewpoint, the NS is frequently compared to the posteromedial cortical nucleus of the amygdala in mammals. However, the structure of these two nuclei is very different: the NS displays concentric laminar organization and is considered to be an invagination of the pallium protruding into the ventricle (Ulinski and Peterson, 1981). The NS has been the subject of relatively few investigations. The efferent connections of the NS have been reported by several authors (Halpern and Silfen, 1974;Hoogland, 1977;Voneida and Sligar, 1979;Halpern, 1980;Stoll and Hoogland, 1984), while systematic analysis of its intrinsic organization has been more limited (Ulinski and Kanarek, 1973). Recently, the distribution of various chemicals in reptilian brains has been studied histochemically (Smeets et al. , 1986;Perez-Clausell, 1988;Smeets, 1988;Smeets and Steinbusch, 1988;. Further information on the structure of the NS is needed. The present study was undertaken to elucidate the intrinsic organization of the NS in the striated snake using the rapid Golgi method. The results revealed detailed features of neuronal morphology and terminal patterns of the afferent fibers, and these are discussed in the context of previous cytoarchitectural, hodologi...

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 95%

See 3 more Smart Citations

A Golgi Study on the Nucleus Sphericus of the Striated Snake, Elaphe quadrivirgata

Iwahori

Nakamura

Tsuda

1995

Okajimas Folia Anatomica Japonica

View full text Add to dashboard Cite

show abstract

Amygdalo-hypothalamic projections in the lizardPodarcis hispanica: A combined anterograde and retrograde tracing study

et al. 1997

View full text Add to dashboard Cite

The cells of origin and terminal fields of the amygdalo-hypothalamic projections in the lizard Podarcis hispanica were determined by using the anterograde and retrograde transport of the tracers, biotinylated dextran amine and horseradish peroxidase. The resulting labeling indicated that there was a small projection to the preoptic hypothalamus, that arose from the vomeronasal amygdaloid nuclei (nucleus sphericus and nucleus of the accessory olfactory tract), and an important projection to the rest of the hypothalamus, that was formed by three components: medial, lateral, and ventral. The medial projection originated mainly in the dorsal amygdaloid division (posterior dorsal ventricular ridge and lateral amygdala) and also in the centromedial amygdaloid division (medial amygdala and bed nucleus of the stria terminalis). It coursed through the stria terminalis and reached mainly the retrochiasmatic area and the ventromedial hypothalamic nucleus. The lateral projection originated in the cortical amygdaloid division (ventral anterior and ventral posterior amygdala). It coursed via the lateral amygdalofugal tract and terminated in the lateral hypothalamic area and the lateral tuberomammillary area. The ventral projection originated in the centromedial amygdaloid division (in the striato-amygdaloid transition area), coursed through the ventral peduncle of the lateral forebrain bundle, and reached the lateral posterior hypothalamic nucleus, continuing caudally to the hindbrain. Such a pattern of the amygdalo-hypothalamic projections has not been described before, and its functional implications in the transfer of multisensory information to the hypothalamus are discussed. The possible homologies with the amygdalo-hypothalamic projections in mammals and other vertebrates are also considered.

show abstract

Organization of anterior dorsal ventricular ridge in snakes

Ulinski

1978

J of Comparative Neurology

View full text Add to dashboard Cite

Anterior dorsal ventricular ridge (ADVR) is a major telencephalic structure in reptiles. The intrinsic, efferent, and afferent connections of ADVR were studied in water snakes (Natrix sipedon) and garter snakes (Thamnophis sirtalis) using orthograde degeneration and Golgi techniques.ADVR in these snakes contains four zones oriented concentric with the ventricular surface and named zones A, B, C, and D, with zone A being the most peripheral. Each zone contains a characteristic population of neurons. Zone A neurons have dendrites which extend obliquely through zone A and into zone B. Zone B neurons have dendrites with a high density of dendritic spines and axons which ramify in zone A concentric with the ventricle, typically bearing large varicosities about 5 p in length. Zone C neurons have dendrites with a low density of dendritic spines and axons which ramify within about 300 p of the soma, typically bearing small varicosities about 3 p in length. Zone D neurons resemble those in zone C, except that their axons may course ventrally out of ADVR into the subjacent striatum.Lesions placed superficially in ADVR produce terminal degeneration which is restricted to ADVR in Fink-Heimer preparations. Lesions which damage the ventral part of ADVR produce degeneration in striatal nuclei (medial striatal nucleus, intrapeduncular nucleus, and perifascicular complex) as well as in the ventral two-thirds of the posterior dorsal ventricular ridge. Unilateral transections of the midbrain produce degeneration in a system of thick caliber axons, with thin collaterals, which enters ADVR caudally behind the anterior commissure and rostrally through the lateral forebrain bundle. These fibers are oriented primarily along the radii of ADVR and confined predominantly to zones B, C, and D.Lesions of the dorsal thalamus produce degeneration in a system of thin caliber axons which enters ADVR rostrally through the lateral forebrain bundle. These fibers course radially through zones C and D and then turn to run concentric with the ventricle in zone B.These observations suggest that snake ADVR consists of two fundamentally different parts. Neurons in zones A and B interact strongly with neighboring neurons through somatosomatic and axodendritic contacts and participate in connections which run concentric with the ventricle. Neurons in zones C and D participate in connections which run radially. Some of the neurons in zone D, and possibly some in zone C, project to the striatum. Neurons situated near the ventral border of ADVR are the only source of ADVR efferents. Neurons in each zone interact with those in neighboring zones. all reptiles. They are of particular interest because they receive ascending thalamic projections which conduct auditory and visual information from the midbrain (Hall and Ebner, '70a,b; Butler and Ebner, '72; Pritz, '74, '75; Foster, '76 (Greenberg, '78) suggests that the striatum plays some role in controlling species specific motor acts. I t is, thus, likely that ADVR occupies an important place in the f...

show abstract

Cytoarchitecture of nucleus sphericus in the common boa, Constrictor constrictor

Cited by 25 publications

References 20 publications

A Golgi Study on the Nucleus Sphericus of the Striated Snake, Elaphe quadrivirgata

A Golgi Study on the Nucleus Sphericus of the Striated Snake, Elaphe quadrivirgata

Amygdalo-hypothalamic projections in the lizardPodarcis hispanica: A combined anterograde and retrograde tracing study

Organization of anterior dorsal ventricular ridge in snakes

Contact Info

Product

Resources

About