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Functional segregation within the pelvic nerve of male rats: a meso- and microscopic analysis.
J Anat. 2020 Jun 29 [Online ahead of print]JA

Abstract

The pelvic splanchnic nerves are essential for pelvic organ function and have been proposed as targets for neuromodulation. We have focused on the rodent homologue of these nerves, the pelvic nerves. Our goal was to define within the pelvic nerve the projections of organ-specific sensory axons labelled by microinjection of neural tracer (cholera toxin, subunit B) into the bladder, urethra or rectum. We also examined the location of peptidergic sensory axons within the pelvic nerves to determine whether they aggregated separately from sacral preganglionic and paravertebral sympathetic postganglionic axons travelling in the same nerve. To address these aims, microscopy was performed on the major pelvic ganglion (MPG) with attached pelvic nerves, microdissected from young adult male Sprague-Dawley rats (6-8 weeks old) and processed as whole mounts for fluorescence immunohistochemistry. The pelvic nerves were typically composed of five discrete fascicles. Each fascicle contained peptidergic sensory, cholinergic preganglionic and noradrenergic postganglionic axons. Sensory axons innervating the lower urinary tract (LUT) consistently projected in specific fascicles within the pelvic nerves, whereas sensory axons innervating the rectum projected in a complementary group of fascicles. These discrete aggregations of organ-specific sensory projections could be followed along the full length of the pelvic nerves. From the junction of the pelvic nerve with the MPG, sensory axons immunoreactive for calcitonin gene-related peptide (CGRP) showed several distinct patterns of projection: some projected directly to the cavernous nerve, others projected directly across the surface of the MPG to the accessory nerves and a third class entered the MPG, encircling specific cholinergic neurons projecting to the LUT. A subpopulation of preganglionic inputs to noradrenergic MPG neurons also showed CGRP immunoreactivity. Together, these studies reveal new molecular and structural features of the pelvic nerves and suggest functional targets of sensory nerves in the MPG. These anatomical data will facilitate the design of experimental bioengineering strategies to specifically modulate each axon class.

Authors+Show Affiliations

Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, Vic., Australia. Department of Visceral Surgery, CHU de Nîmes, Nîmes, France. Montpellier Laboratory of Informatics, Robotics and Microelectronics (LIRMM), ICAR Team, French National Centre for Scientific Research (CNRS), Montpellier University, Montpellier, France.Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, Vic., Australia.Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, Vic., Australia.Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, Vic., Australia.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32598494

Citation

Bertrand, Martin M., et al. "Functional Segregation Within the Pelvic Nerve of Male Rats: a Meso- and Microscopic Analysis." Journal of Anatomy, 2020.
Bertrand MM, Korajkic N, Osborne PB, et al. Functional segregation within the pelvic nerve of male rats: a meso- and microscopic analysis. J Anat. 2020.
Bertrand, M. M., Korajkic, N., Osborne, P. B., & Keast, J. R. (2020). Functional segregation within the pelvic nerve of male rats: a meso- and microscopic analysis. Journal of Anatomy. https://doi.org/10.1111/joa.13221
Bertrand MM, et al. Functional Segregation Within the Pelvic Nerve of Male Rats: a Meso- and Microscopic Analysis. J Anat. 2020 Jun 29; PubMed PMID: 32598494.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Functional segregation within the pelvic nerve of male rats: a meso- and microscopic analysis. AU - Bertrand,Martin M, AU - Korajkic,Nadja, AU - Osborne,Peregrine B, AU - Keast,Janet R, Y1 - 2020/06/29/ PY - 2020/03/11/received PY - 2020/04/22/revised PY - 2020/04/27/accepted PY - 2020/6/30/entrez KW - autonomic ganglion KW - bioelectronic medicine KW - inferior hypogastric plexus KW - parasympathetic KW - pelvic ganglion KW - splanchnic nerve KW - sympathetic KW - urinary tract KW - visceral nerve JF - Journal of anatomy JO - J. Anat. N2 - The pelvic splanchnic nerves are essential for pelvic organ function and have been proposed as targets for neuromodulation. We have focused on the rodent homologue of these nerves, the pelvic nerves. Our goal was to define within the pelvic nerve the projections of organ-specific sensory axons labelled by microinjection of neural tracer (cholera toxin, subunit B) into the bladder, urethra or rectum. We also examined the location of peptidergic sensory axons within the pelvic nerves to determine whether they aggregated separately from sacral preganglionic and paravertebral sympathetic postganglionic axons travelling in the same nerve. To address these aims, microscopy was performed on the major pelvic ganglion (MPG) with attached pelvic nerves, microdissected from young adult male Sprague-Dawley rats (6-8 weeks old) and processed as whole mounts for fluorescence immunohistochemistry. The pelvic nerves were typically composed of five discrete fascicles. Each fascicle contained peptidergic sensory, cholinergic preganglionic and noradrenergic postganglionic axons. Sensory axons innervating the lower urinary tract (LUT) consistently projected in specific fascicles within the pelvic nerves, whereas sensory axons innervating the rectum projected in a complementary group of fascicles. These discrete aggregations of organ-specific sensory projections could be followed along the full length of the pelvic nerves. From the junction of the pelvic nerve with the MPG, sensory axons immunoreactive for calcitonin gene-related peptide (CGRP) showed several distinct patterns of projection: some projected directly to the cavernous nerve, others projected directly across the surface of the MPG to the accessory nerves and a third class entered the MPG, encircling specific cholinergic neurons projecting to the LUT. A subpopulation of preganglionic inputs to noradrenergic MPG neurons also showed CGRP immunoreactivity. Together, these studies reveal new molecular and structural features of the pelvic nerves and suggest functional targets of sensory nerves in the MPG. These anatomical data will facilitate the design of experimental bioengineering strategies to specifically modulate each axon class. SN - 1469-7580 UR - https://www.unboundmedicine.com/medline/citation/32598494/Functional_segregation_within_the_pelvic_nerve_of_male_rats:_a_meso-_and_microscopic_analysis L2 - https://doi.org/10.1111/joa.13221 DB - PRIME DP - Unbound Medicine ER -
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