Autonomic Innervation of Intra- and Extra-Cranial Arteries in the Amphibia : Physiology

概要

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The pattern of adrenergic and cholinergic innervation in the intra- and extra-cranial arteries of the internal carotid and vertebro-basilar systems was investigated using histochemical techniques in three amphibian species, the Japanese toad, the clawed toad and the leopard frog. As a common feature among these three anuran species, the adrenergic and cholinergic innervation density in the major cerebral artery system was low when compared with the extra-cranial internal carotid artery. In the Japanese toad the adrenergic and cholinergic nerve supply to the two cerebral artery systems was more predominant in the internal carotid system than in the vertebro-basilar system. It was similar in the leopard frog. Adrenergic nerve plexuses in the major cerebral arteries in the Japanese toad were dense compared with those in the leopard frog, but the density of cholinergic nerve plexuses was quite similar in both species. In the clawed toad the nerve fibers showing catecholamine fluorescence or acetylcholin-esterase (AChE) activity were not observed in any pial arteries, except for very few aminergic and AChE-positive fibers in the cerebral carotid artery. The direct innervation by the adrenergic and cholinergic nerves of central origin was demonstrated in the intracerebral small vessels of the clawed toad.
社団法人日本動物学会の論文
1989-04-15