Abstract:
:Electron microscopy of the pineal receptor cells in light- and dark-adapted brook trout, Salvelinus fontinalis and the rainbow trout, Salmo gairdneri, revealed no significant differences in the tubular and filamentous elements of the inner segment, neck and supranuclear regions. However, changes in synaptic relations between the photoreceptor and nerve cell were induced by light and darkness. In the light-adapted state, the synaptic relationship between axon terminals and photoreceptor basal processes predominates, while in darkness the synapses between photoreceptor basal processes and ganglion cell dendrites are more prominent. Further, in darkness, the photoreceptor basal processes show a number of synaptic vesicles and synaptic ribbons. These findings suggest that the sensory function of the fish pineal is enhanced during darkness but inhibited by light, and that the synaptic relationships are involved in the control of sensory activity in the pineal photoreceptor and ganglion cells. These results corroborate those of electrophysiological studies in that the maximal spontaneous discharge frequency of the ganglion cells occurs in the dark, and it also shows a burst when light is removed. The "typical" chemical synapse between the axon terminal and the photoreceptor basal process in light seems to function as an inhibitor.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Omura Y,Ali MAdoi
10.1007/BF00234177subject
Has Abstractpub_date
1980-01-01 00:00:00pages
111-22issue
1eissn
0302-766Xissn
1432-0878journal_volume
208pub_type
杂志文章abstract::Their strategic location between blood and tissue and their constitutive properties allow endothelial cells (EC) to monitor the transport of plasma molecules, by employing bidirectional receptor-mediated and receptor-independent transcytosis and endocytosis, and to regulate vascular tone, cellular cholesterol and lipi...
journal_title:Cell and tissue research
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journal_title:Cell and tissue research
pub_type: 杂志文章
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journal_title:Cell and tissue research
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journal_title:Cell and tissue research
pub_type: 杂志文章
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