Spinal Afferent Innervation in Flat-Mounts of the Rat Stomach: Anterograde Tracing

Author:

Ma Jichao1,Nguyen Duyen1,Madas Jazune1,Kwiat Andrew M.1,Toledo Zulema1,Bizanti Ariege1,Kogut Nicole1,Mistareehi Anas1,Bendowski Kohlton1,Zhang Yuanyuan1,Chen Jin1,Li De-Pei2,Powley Terry L.3,Furness John B.4,Cheng zixi jack1

Affiliation:

1. University of Central Florida

2. University of Missouri

3. Purdue University

4. University of Melbourne

Abstract

Abstract The dorsal root ganglia (DRG) project spinal afferent axons to the stomach. However, the distribution and morphology of spinal afferent axons in the stomach have not been well characterized. In this study, we used a combination of state-of-the-art techniques, including anterograde tracer injection into the left DRG T7-T11, avidin-biotin and Cuprolinic Blue labeling, Zeiss M2 Imager, and Neurolucida to characterize spinal afferent axons in the flat-mounts of the whole rat stomach muscular wall. We found that spinal afferent axons innervated all regions with a variety of distinct terminal structures innervating different gastric targets: 1) The ganglionic type: some axons formed varicose contacts with individual neurons within myenteric ganglia. 2) The muscle type: most axons ran in parallel with the longitudinal and circular muscles and expressed spherical varicosities. Complex terminal structures were observed within the circular muscle layer. 3) The ganglia-muscle mixed type: some individual varicose axons innervated both myenteric ganglia and circular muscles, exhibiting polymorphic terminal structures. 4) The vascular type: individual varicose axons ran along the blood vessels and occasionally traversed the vessel wall. This work provides a foundation for future topographical anatomical and functional mapping of spinal afferent axon innervation of the stomach under normal and pathophysiological conditions.

Publisher

Research Square Platform LLC

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