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Sympathetic Tales: Subdivisons of the Autonomic Nervous System and the Impact of Developmental Studies Uwe Ernsberger* and Hermann Rohrer

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Sympathetic Tales: Subdivisons of the Autonomic Nervous System and the Impact of Developmental Studies Uwe Ernsberger* and Hermann Rohrer Ernsberger and Rohrer Neural Development (2018) 13:20 https://doi.org/10.1186/s13064-018-0117-6 REVIEW Open Access Sympathetic tales: subdivisons of the autonomic nervous system and the impact of developmental studies Uwe Ernsberger* and Hermann Rohrer Abstract Remarkable progress in a range of biomedical disciplines has promoted the understanding of the cellular components of the autonomic nervous system and their differentiation during development to a critical level. Characterization of the gene expression fingerprints of individual neurons and identification of the key regulators of autonomic neuron differentiation enables us to comprehend the development of different sets of autonomic neurons. Their individual functional properties emerge as a consequence of differential gene expression initiated by the action of specific developmental regulators. In this review, we delineate the anatomical and physiological observations that led to the subdivision into sympathetic and parasympathetic domains and analyze how the recent molecular insights melt into and challenge the classical description of the autonomic nervous system. Keywords: Sympathetic, Parasympathetic, Transcription factor, Preganglionic, Postganglionic, Autonomic nervous system, Sacral, Pelvic ganglion, Heart Background interplay of nervous and hormonal control in particular The “great sympathetic”... “was the principal means of mediated by the sympathetic nervous system and the ad- bringing about the sympathies of the body”. With these renal gland in adapting the internal milieu to the chan- words Langley [1, 2] summarized the ideas of Winslow ging external challenges the organism meets. [3] on connectivity and function of the intercostal nerve In this review we first describe the anatomical and in his treatise on human anatomy. Within the general physiological findings that led to the formulation of the term “sympathetic” he included three nerves, the inter- classical model of the autonomic nervous system, subdi- costal nerve or great sympathetic synonymous to the vided into sympathetic and parasympathetic subsystems, paravertebral sympathetic chain, the medium sympa- acting partly in antagonistic manner. The heart as a thetic synonymous to the par vagum or pair of vagus prime target of autonomic innervation is discussed with nerves and the small sympathetic synonymous to the respect to the historical unfolding of the physiological portio dura of the seventh nerve. Thus, nearly two cen- function of both autonomic nervous pathways regulating turies before the large breakthroughs in physiological heart activity, their anatomical trajectories and the posi- studies on nervous tissue and the synthesis of histo- tions of the neuron cell bodies involved. We then con- logical and cellular studies towards the neuron theory, sider the electrophysiological and neurochemical the vagus and sympathetic nerves were linked by their features of autonomic neurons, to illustrate neuron di- naming and the assumption that these nerves are sub- versity even within each of the autonomic subsystems stantially involved in the matching of functional states and to compare the cranial, thoracolumbar and sacral among the different organs. This idea was taken up two autonomic domains, their constituent cells and targets. centuries later by Cannon [4] in his monograph “The This paves the way to delineate neuron development Wisdom of the Body” and the attempt to understand the and factors regulating the acquisition of neuron subtype- specific features determining functional properties. We * Correspondence: [email protected] highlight transcription factor fingerprints of pregangli- Institute for Clinical Neuroanatomy, Goethe University, Theodor-Stern-Kai 7, onic and postganglionic neurons at different axial levels 60590 Frankfurt/Main, Germany © The Author(s). 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Ernsberger and Rohrer Neural Development (2018) 13:20 Page 2 of 21 that suggest a sympathetic rather than parasympathetic de- subdivision. While the effects of adrenaline closely resem- velopmental profile of the sacral spinal cord outflow, which ble the majority but not all effects of sympathetic nerve stands in stark contrast to the classical model of auto- stimulation, the effects of pilocarpine mimic the effects of nomic neuron domains. Then we discuss the limitations of parasympathetic nerve stimulation. our understanding of the mechanisms responsible for the For Langley [1, 14]itappearedconvenienttocoverthe selective innervation of postganglionic neuron populations tectal and the bulbo – sacral nerves under the name para- by the appropriate preganglionic neurons. Together with sympathetic since they differ in their pharmacological re- the more detailed characterization of a range of autonomic sponse from the sympathetic nerves whose action in neuron populations so far underrepresented in the mo- general can be mimicked by application of adrenaline. He lecular and developmental analysis, a comprehensive un- was eager to point out, however, that the sweat gland derstanding of the cellular composition and connectivity of regulation by sympathetic nerves poses an exception as this the autonomic nervous system is expected to emerge. target tissue responds to pilocarpine similar to parasympa- thetic target tissues. In addition, Langley emphasized that Main text sympatheticnervessupplyallpartsofthebodywhilethe Formulation of the classical model for the autonomic or parasympathetic nerves supply only special parts. involuntary nervous system at the turn to the 20th century An important issue in Langley’ssynthesis[1] is the dis- During the last two decades of the 19th century a series cussion of the source of the preganglionic axons to the of keystone publications on structure and function of sympathetic and parasympathetic system. He emphasized autonomic nerves were released from the Gaskell and the critical contribution by Gaskell [5, 7] on the distribu- Langley labs that provided the foundation for the think- tion of myelinated fibers in the communicating rami, ing about the “autonomic” [1]or“involuntary” [5] ner- pointing out the gaps in their presence between thoracol- vous system dominating the 20th century. umbar levels and cranial as well as sacral levels. This is Gaskell attempted to replace the nomenclature of the nicely illustrated by Gaskell [7] in his classical publication efferent nerves, which to him in part appeared entirely on the white and gray rami communicantes and the vis- artificial or hypothetical, by fundamental divisions of the ceral nerves in particular in dogs as well as by Pick and nervous system where physiological and structural prop- Sheehan [15] presenting a drawing of the macroscopic erties can be grouped together. In a series of landmark situation in man from cervical to sacral levels and papers on the nerves innervating the heart [6], the vis- cross-sections on individual rami communicantes. ceral and vascular systems [7] and the cranial nerves [8], Gaskell noticed the differences in the presence of small Integration of knowledge into the classical model of the and non-myelinated (non-medullated) fibers in the autonomic nervous system during the 20th century nerves leaving the central nervous system from cranial The classical model of the sympathetic and parasympa- to sacral levels. This histological approach to classify the thetic nervous system provided an amazingly constructive efferent nervous system to the vascular and visceral framework for results coming in from the biomedical dis- muscles led to a subdivision into bulbar, thoracolumbar ciplines at increasing speed. The division into two subsys- and sacral parts in addition to a small mesencephalic tems acting at least in part in an antagonistic manner section [5]. A very similar conclusion was drawn by based on two neurotransmitter systems provided a very at- Langley [1] from a series of studies combining histological tractive framework for considering system biological analysis, electrical stimulation, pharmacological interven- problems and to confront a vast range of therapeutic chal- tion and nerve transection in the autonomic nervous sys- lenges. The opposite action of sympathetic and parasym- tem as exemplified by a series of treatises on the pathetic stimulation on the ciliary muscle, the heart and innervation of the pelvic and adjoining viscera [9–12]. the reproductive organs were but three examples where The use of nicotine allowed the interruption of ganglionic the attraction of this approach became apparent. Histo- transmission and the separation of preganglionic and logical, electrophysiological, pharmacological and neuro- postganglionic effects upon electrical stimulation of auto- chemical approaches became the main motors to nomic nerves. With the help of adrenaline and pilocar- complete an anatomical and physiological description of pine, as exemplified by the analysis of sweat gland cellular structure and function of the autonomic nervous regulation
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