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Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla

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The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
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The sympathetic division of the autonomic nervous system (ANS) plays a crucial role in preparing the body for stress, physical activity, and increased energy demands. This division activates the "fight-or-flight" response, enabling individuals to respond effectively to challenging situations.
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Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
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The parasympathetic division of the autonomic nervous system (ANS) regulates rest and digestion functions in the body. It works in opposition to the sympathetic division, promoting relaxation, conservation of energy, and digestion. The parasympathetic division consists of preganglionic fibers originating from specific cranial nerves (III, VII, IX, X) and the sacral spinal nerves (S2-S4). These fibers synapse with postganglionic neurons in the terminal ganglia, innervating various organs and...

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Cellular and molecular mechanisms underlying plasticity in uterine sympathetic nerves.

M Mónica Brauer¹

¹Laboratory of Cell Biology, Instituto de Investigaciones Biológicas Clemente Estable, Avenida Italia 3318, Montevideo 11600, Uruguay. brauer@iibce.edu.uy

Autonomic Neuroscience : Basic & Clinical

|April 12, 2008

Summary

Sex hormones dynamically alter uterine sympathetic nerves, causing degeneration and regeneration. This plasticity involves changes in uterine tissue

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Area of Science:

Autonomic Nervous System Physiology
Reproductive Endocrinology
Neurobiology

Background:

Uterine sympathetic nerves exhibit remarkable plasticity in response to sex hormones.
Nerve density changes occur during the oestrous cycle, pregnancy, and postpartum.
Previous understanding focused on hormonal effects on neurons; recent research explores target tissue influence.

Purpose of the Study:

To review the dynamic responses of uterine sympathetic nerves to sex hormones.
To highlight cellular and molecular mechanisms underlying uterine nerve plasticity.
To explore the role of the uterine microenvironment in supporting innervation.

Main Methods:

Review of existing literature on uterine sympathetic nerve physiology and plasticity.
Analysis of studies investigating hormonal influences on neurotrophic factors and signaling molecules.
Examination of evidence for changes in uterine tissue's ability to support innervation.

Main Results:

Sex hormones, particularly estrogen, and pregnancy significantly alter uterine sympathetic nerve density.
Evidence suggests uterine tissue changes its neuritogenic properties, influencing nerve support.
Uterine-related sympathetic neurons' receptivity to target-derived signals is modulated by sex hormones.

Conclusions:

Uterine sympathetic nerve plasticity is a complex interplay between hormones, neurons, and the uterine microenvironment.
Estrogen and pregnancy induce changes in the uterine tissue's capacity to support innervation.
Further research is needed to fully elucidate the signaling molecules involved in this neurotrophic plasticity.