Journal ArticleDOI
Seasonal variations in the cerebrospinal fluid-contacting area of the pineal gland in the golden hamster (Mesocricetus auratus).
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The results reveal that in this area the ventricular surface is composed of glial cell processes and protruding pinealocytes, and the relative extent of these two components varies considerably and seems to be related to the season of the year.Abstract:
The cerebrospinal fluid-contacting area in the pineal recess of the golden hamster (Mesocricetus auratus) has been investigated light and electron microscopically. The results reveal that in this area the ventricular surface is composed of glial cell processes and protruding pinealocytes. The relative extent of these two components varies considerably and seems to be related to the season of the year: Morphometric analysis shows that in June, the mean size of the total cerebrospinal fluid-contracting area and, in addition, the relative extent of the area occupied by protruding pinealocytes is significantly larger than in November. The physiological significance of this finding remains to be determined.read more
Citations
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Journal ArticleDOI
Cellular lining of the sheep pineal recess studied by light-, transmission-, and scanning electron microscopy: morphologic indications for a direct secretion of melatonin from the pineal gland to the cerebrospinal fluid.
TL;DR: The results show that endocrine cells in this specialized area of the ventricular system are in direct contact with the cerebrospinal fluid, and this finding supports the physiological concept of a direct secretion of melatonin into the Cerebrosp spinal fluid of the sheep pineal recess.
Journal ArticleDOI
The ultrastructure of mammalian pinealocytes: a systematic investigation.
TL;DR: Whereas sufficient structural information now exists on cytoplasmic organelles such as synaptic ribbons and spherules, annulate lamellae, subsurface cisterns, and the several types of synaptic arrangements seen in relation to the pinealocyte soma and its processes, the functional role of these structures in pineal synthetic processes remains to be elucidated.
Journal ArticleDOI
Melatonin seems to be a mediator that transfers the environmental stimuli to oocytes for inheritance of adaptive changes through epigenetic inheritance system.
M.K. Irmak,T. Topal,S. Oter +2 more
TL;DR: It is suggested that melatonin induces epigenetic modifications by affecting the nuclear melatonin receptors that can in turn change the superstructure of DNA.
Book ChapterDOI
Mammalian pinealocytes: ultrastructural aspects and innervation.
TL;DR: In the mammalian pineal gland, pinealocytes contain organelles, the so-called 'synaptic' ribbons, histophysiological studies of which provide important insights into the structural and functional complexity of the organ.
Journal ArticleDOI
Development of the photoreceptor outer segment-like cilia of the CSF-contacting pinealocytes of the ferret (Putorius furo).
Béla Vigh,I. Vigh-Teichmann +1 more
TL;DR: The postnatal development of the pineal organ of the ferret was investigated electron-microscopically with special interest given to the cerebrospinal fluid-contacting pinealocytes and their large, vesiculated cilia to elucidate whether the early differentiation of the cilia and synapses indicates a timing of the circadian light rhythmicity in young ferrets by direct pineal photosensitivity.
References
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Journal ArticleDOI
THE USE OF LEAD CITRATE AT HIGH pH AS AN ELECTRON-OPAQUE STAIN IN ELECTRON MICROSCOPY
TL;DR: The stain reported here differs from previous alkaline lead stains in that the chelating agent, citrate, is in sufficient excess to sequester all lead present, and is less likely to contaminate sections.
Journal ArticleDOI
Improvements in epoxy resin embedding methods.
TL;DR: Epoxy embedding methods of Glauert and Kushida have been modified so as to yield rapid, reproducible, and convenientembedding methods for electron microscopy.
Journal ArticleDOI
The fine structure of the gastric mucosa in the bat.
Susumu Ito,Robert J. Winchester +1 more
TL;DR: The fine structure of the various cell types in this species is fundamentally similar to that of the corresponding cell types of other mammals, but the relative cell numbers and distribution are somewhat different.
Book ChapterDOI
Functional electron microscopy of the hypothalamic median eminence.
TL;DR: The functions of the median eminence are completely different from those of the pars nervosa; however, the Median eminence is an independent neuroendocrine organ.
Journal ArticleDOI
Pineal Rhythm in N-Acetyltransferase Activity in Rats under Different Artificial Photoperiods and in Natural Daylight in the Course of a Year
Helena Illnerová,Jiří Vaněček +1 more
TL;DR: Differences in the N-acetyltransferase rhythm and consequently in the rhythm ofmelatonin formation in natural daylight throughout the year and under different artificial photoperiods supports the hypothesis that the changing rhythmic pattern of melatonin release might be a mechanism by means of which a photic information is transformed into a humoral one.