Abstract
Pineal glands of yellow-bellied country-rats (Rattus losea Swinhoe) were studied with conventional electron microscopy and Wood’s glutaraldehyde-dichromate (GD) technique for primary monoamines. Nerve endings containing numerous granulated vesicles were frequently observed in the perivascular spaces and their extensions, and also in the parenchyma of the pineals processed with the conventional electron microscopy. In pineals treated with the GD technique, clusters of electron dense positive reavtive partivles, mainly located in the perivascular area, were identified as dense cores of granulated vesicles in the nerve endings. These observations indicated that granulated vesicles in the nerve endings contained monoamines and the nerve endings were monoaminergic in nature.
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