Fluorescence Microscopic Observations on the Brain of the Lamprey, <i>Lampetra japonica</i>

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

“…They are the peptidergic neuron belonging to the nucleus preopticus (TSUNEKI and GORBMAN, 1975;YUI and HONMA, 1979) and two types of aminergic neurons, i.e., cathecholamine-and indolealkylamine (most probably 5-hydroxy-triptamine or serotonin)-containing cells (HONMA, 1969;KONSTANTINOVA, 1973;OCHI and HOSOYA, 1974). 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.…”

“…The neuronal elements in the cerebral ventricles have been reported in different vertebrates from cyclostomes to mammals (LEONHARDT and PRIEN, 1968;HONMA, 1969;VIGH and VIGH-TEICHMANN, 1973;PAULL et al, 1974;EVAN et al, 1976 a, b;SCOTT et al, 1976;MITCHELL and CARD, 1978). In general, these elements are divisible into two categories: the supraependymal neurons and the cerebrospinal fluid (CSF)-contacting subependymal neurons with an intraventricular process.…”

“…In general, these elements are divisible into two categories: the supraependymal neurons and the cerebrospinal fluid (CSF)-contacting subependymal neurons with an intraventricular process. 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).…”

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

“…Occurrence of monoamine-containing subependymal cells that possess an apical process which is in contact with the cerebrospinal fluid (CSF) has been demonstrated in the hypothalamus of the lamprey by fluorescence microscopy (HONMA, 1969;HONMA and HONMA, 1970;BAUMGARTEN, 1972;KONSTANTINOVA, 1973 KONSTANTINOVA (1973). Using a new filter system for fluorescence microscopy, OCHI and HOSOYA (1974) have also identified two kinds of fluorescent subependymal cells in the hypothalamus and spinal cord of the lamprey, or the blue-green catecholamine-containing cells and the yellow indolalkylamine-containing cells.…”

“…It has been reported that in the hypothalamus of the lamprey examined by 10 11 means of the fluorescence microscope, the fluorescent CSF-contacting nerve cells were distributed around the posterior recess and in the lateral wall of the infundibular recess (HONMA, 1969;HONMA and HONMA, 1970), in the ventral part of the third ventricle, immediately superior to the preoptic recess and in the infundibular and posterior recesses (KONSTANTINOVA, 1973). OCHI and HOSOYA (1974) reported that yellow fluorescent cells containing indolalkylamine (most probably 5-hydroxytryptamine) were less frequently encountered than the blue-green fluorescent cells containing catecholamine in the lateral wall of the third ventricle in the hypothalamus caudal to the optic chiasm.…”