Fine Structures of the Cerebrospinal Fluid-Contacting Neurons in the Hypothalamus of the Lamprey, &lt;i&gt;Lampetra japonica&lt;/i&gt;

Nakai, Yasumitsu; Shioda, Seiji; Tashiro, Naosuke; Honma, Yoshio

doi:10.1679/aohc1950.42.337

Cited by 10 publications

(7 citation statements)

References 26 publications

(22 reference statements)

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“…The present work suggests the possibility that the supraependymal neurons may regulate the function of the CSF-contacting neurons as was stated previously by NAKAI et al (1979). Thus, involvement of the supraependymal neurons in the hypothalamic neuroendocrine system of the lamprey is implied.…”

Section: Discussionsupporting

confidence: 85%

“…They occurred not only in the preoptic, infundibular and posterior recesses (NAKAI et al, 1979), but also in other regions within the third ventricle such as the lamina terminalis and the most anterior part of the lateral wall adjacent to the interventricular foramen.…”

Section: Discussionmentioning

confidence: 98%

“…Furthermore, it has been suggested that these neurons may release the monoamines (KONSTANTINOVA, 1973) or the granular content (NAKAI et al, 1979) into the ventricle.…”

Section: Discussionmentioning

confidence: 99%

“…The blocks were sputter-coated with gold and observed with a scanning electron microscope (Hitachi S-500) under the accelerating voltage of 15 kV. The procedure for transmission electron microscopy has been described elsewhere (NAKAI et al, 1979).…”

Section: Methodsmentioning

confidence: 99%

“…The CSFcontacting neurons in the third ventricular wall of the lamprey brain have been studied in various ways: fluorescence microscopy (HONMA, 1969;HONMA and HONMA, 1970;BAUMGARTEN, 1972;KONSTANTINOVA, 1973;OCHI and HOSOYA, 1974), Golgi impregnation in combination with retrograde axonal transport studies (YUI and HONMA, 1979) and scanning and transmission electron microscopy (SHIODA et al, 1977;NAKAI et al, 1979). However, little is known of the structure and distribution of the supraependymal neurons in the lamprey (NAKAI et al, 1979). In this study, both scanning and transmission electron microscopic observations were performed to clarify the surface fine structure and topographical distribution of the supraependymal neurons in the third cerebral ventricle of the lamprey.…”

mentioning

confidence: 99%

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Scanning and transmission electron microscope studies of the supraependymal neurons in the third ventricular wall of the arctic lamprey,Lampetra japonica.

Chibá

Honma

Nakai

et al. 1981

Arch. Histol. Jap., Arch. Histol. Jpn

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 98%

“…Furthermore, it has been suggested that these neurons may release the monoamines (KONSTANTINOVA, 1973) or the granular content (NAKAI et al, 1979) into the ventricle.…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Scanning and transmission electron microscope studies of the supraependymal neurons in the third ventricular wall of the arctic lamprey,Lampetra japonica.

Chibá

Honma

Nakai

et al. 1981

Arch. Histol. Jap., Arch. Histol. Jpn

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Descending brain‐spinal cord projections in a primitive vertebrate, the lamprey: Cerebrospinal fluid‐contacting and dopaminergic neurons

Barreiro‐Iglesias

Villar-Cerviño

Anadón

et al. 2008

J of Comparative Neurology

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We used Neurobiotin as a retrograde tract tracer in both larval and adult sea lampreys and observed a number of neuronal brainstem populations (mainly reticular and octaval populations and some diencephalic nuclei) that project to the spinal cord, in agreement with the results of previous tracer studies. We also observed small labeled neurons in the ventral hypothalamus, the mammillary region, and the paratubercular nucleus, nuclei that were not reported as spinal projecting. Notably, most of the labeled cells of the mammillary region and some of the ventral hypothalamus were cerebrospinal fluid-contacting (CSF-c) neurons. Combined tract tracing and immunocytochemistry showed that some of the labeled neurons of the mammillary and paratubercular nuclei were dopamine immunoreactive. In addition, some CSF-c cells were labeled in the caudal rhombencephalon and rostral spinal cord, and many were also dopamine immunoreactive. Results with other tracers (biotinylated dextran amines, horseradish peroxidase, and the carbocyanine dye DiI) also demonstrated that the molecular weight or the molecular nature of the tracer was determinant in revealing diencephalic cells with very thin axons. The results show that descending systems afferent to the spinal cord in lampreys are more varied than previously reported, and reveal a descending projection from CSF-c cells, which is unknown in vertebrates. The present results also reveal the existence of large differences between agnathans and gnathostomes in the organization of the dopaminergic cells that project to the spinal cord.

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The hypothalamo-hypophysial system in Acipenseridae

Polenov¹,

Efimova²,

Konstantinova³

et al. 1983

Cell Tissue Res.

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"Falck-positive" monoaminergic neurosecretory cells (M-NSC) are found in stage I-II sturgeon larvae in the dorsal zone of the preoptic nucleus (PN) by means of fluorescence and electron microscopy. Single poorly differentiated M-NSC are located mostly among the ependymal cells. At this stage the M-NSC have very short dendrites protruding into the third ventricle. In the process of differentiation the M-NSC move subependymally and their dendrites become longer. Axons of the M-NSC can be clearly traced only in stage IV larvae. Perikarya and dendrites of M-NSC contain little rough endoplasmic reticulum and numerous neurosecretory granules (NSG) 60-150 nm in diameter. Ventricular dendrites of the "Gomori-positive" peptidergic neurosecretory cells (P-NSC) containing NSG 110-200 nm in diameter are observed within the PN in stage III larvae. Thus the M-NSC differentiate earlier than the P-NSC. The intraventricular terminals have kinocilia and show typical macroapocrine secretion. This fact supports the view of a receptory as well as a secretory function of the M-NSC and P-NSC. It is proposed that in early ontogeny monoamine as well as peptide neurohormones are secreted into the cerebrospinal fluid. This transventricular pathway is considered phylogenetically ancient.

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Fine Structures of the Cerebrospinal Fluid-Contacting Neurons in the Hypothalamus of the Lamprey, <i>Lampetra japonica</i>

Cited by 10 publications

References 26 publications

Scanning and transmission electron microscope studies of the supraependymal neurons in the third ventricular wall of the arctic lamprey,Lampetra japonica.

Scanning and transmission electron microscope studies of the supraependymal neurons in the third ventricular wall of the arctic lamprey,Lampetra japonica.

Descending brain‐spinal cord projections in a primitive vertebrate, the lamprey: Cerebrospinal fluid‐contacting and dopaminergic neurons

The hypothalamo-hypophysial system in Acipenseridae

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