摘要:

The distribution of synapses and synaptic bouton types in the mesencephalic trigeminal (Me5) nucleus was examined in a quantitative electron-microscopical study. Of 588 terminal boutons that were counted in the compact caudal part of the Me5 nucleus, less than 8% formed synapses on the somata of the predominantly unipolar Me5 neurons. About 79% formed synapses on fibres located between the Me5 somata, while about 13% of the vesicle-containing terminals had no clear synaptic specialization. All of these non-synaptic terminals were G type boutons, with pleomorphic and large characteristic dense-core vesicles. Approximately 60% of the axosomatic synapses were of the S type, containing spherical vesicles and an asymmetrical or symmetrical synaptic specialization. About 20, respectively 15% of the axosomatic synapses, were of the F, respectively P type; both are symmetrical synapse types containing either a majority of flat or pleomorphic vesicles. Less than 10% of the axosomatic synapses were of the G type. Although some proportional differences were noted, an almost similar bouton type distribution pattern was found for the axodendritic synapses suggesting that the axosomatic and axodendritic synapses in the Me5 nucleus are part of the same afferent fibre plexus covering the Me5 nucleus.

ISSN:1422-6405    

DOI:10.1159/000147231

出版商:S. Karger AG    

年代:1992

数据来源: Karger

摘要:

In order to establish the prevalence of solid cell nests (SCN) in adult thyroids, we studied 100 consecutive glands at necropsy. These were serially sectioned and stained with routine and immunoperoxidase techniques in order to detect calcitonin, carcinoembryonic antigen, thyroglobulin and keratin. SCN may be considered as normal thyroid gland components, and they share with C cells a common origin in the ultimobranchial body.

ISSN:1422-6405    

DOI:10.1159/000147232

出版商:S. Karger AG    

年代:1992

数据来源: Karger

摘要:

The pattern of the digestive vasoactive intestinal polypeptide (VΙP)-ergic innervation is described immunohistochemically in the hedgehog Erinaceus europaeus. This animal is a small-sized, wild, nocturnal, lower eutherian mammal whose gastrointestinal tract shows some similarities with the avian gut. The myenteric plexus of the stomach, the mucosa of the small intestine and the circular muscle layer of the large intestine are the best VIP-innervated structures. The pattern of the positive innervation is similar to that described in other mammals and in some bird species. The widespread diffusion of the neuropeptide in the gut is probably due to the importance of its functions in the digestive physiology

ISSN:1422-6405    

DOI:10.1159/000147233

出版商:S. Karger AG    

年代:1992

数据来源: Karger