Innervation Pattern of Acetylcholinesterase(AChE)-Positive Nerves in the Internal Carotid Artery and Cerebral Arterial Tree of the Pigeon.

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The pathway and distribution of nerves positive for acetylcholinesterase (AChE) in the internal carotid artery (ICA) and cerebral arterial tree were investigated histochemically in the pigeon. In this bird, cerebral perivascular AChE nerves originated mainly in AChE nerve cells within the ganglia found in the ICA near the cranial cavity. Some of the AChE fiber bundles from the ganglia made up very dense plexuses of AChE nerves throuhout the distal segment of the ICA. Others projected to the cerebral arterial tree via the cerebral carotid artery, and spread rostrally and caudally to send abundant AChE axons to the major cerebral arteries of both the internal carotid and vertebrobasilar systems (ICS, VBS). In addition to this major neuronal pathway, a substantial amount of AChE nerves also projected to the ICS via the internal ethmoidal artery and to the VBS via the vertebral artery. Consequently, the ICA and major cerebral arteries in the pigeon received the richest supply of AChE nerves among the avian species studied so far. This finding may suggest the great significance of cholinergic vasomotor actions for functioning of these arteries in the blood supply to the pigeon brain.
日本家禽学会の論文