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Peripheral autonomic nervous system in the pancreas of the lizard Lacerta dugesii was investigated under light, fluorescence and electron microscopy.1. A low nerve fiber density was remarked both in the exocrine and endocrine tissues of the pancreas.2. The nerve fibers were distributed uniformly in various gland areas.3. The distribution of both adrenergic and cholinergic components of the innervation appeared fairly well balanced in the acinar and islet tissue.4. Nervous cell elements (Cajal interstitial cells or ganglionary cells) were absent.5. The direct juxtaposition of two axons was observed occasionally and was considered as evidence for the existence of axo-axonal synapses postulated by EHINGER et al. (1970).6. No close contact was recognized between the nerve fibers and the exocrine and endocrine cells.7. In the islets of Langerhans were detected: biogenic monoamines, probably in B-cells; and acetylcholinesterase (AChE), mainly in B- and A (A2)-cells.The above observations and others concerning the fine structure and nature of nerve fibers as well as the ultrastructural localization of AChE activity in the nerve fibers, endocrine cells and connective tissue are discussed in connection with the results of other authors.

archivum histologicum japonicum

Innervation of the Pancreas of the Lizard &lt;i&gt;Lacerta dugesii&lt;/i&gt; (M.-Edw.) Studied by Light, Fluorescence and Electron Microscopy, with Special Regard to the Acetylcholinesterase Activity in the Islets of Langerhans