[Structuro-functional organization of the vegetative (autonomic) nervous system]

Area of Science:

• Neuroscience
• Autonomic Nervous System Physiology

Context:

• The autonomic nervous system is traditionally divided into sympathetic and parasympathetic components.
• Emerging research identifies a distinct 'metasympathetic' part within the autonomic nervous system.
• This system comprises microganglia embedded in the walls of visceral organs, demonstrating significant motor control.

Purpose:

• To delineate the structural and functional characteristics of the metasympathetic nervous system.
• To explore its unique autonomy and connectivity with central nervous system pathways.
• To identify its functional elements, neural network architecture, and neurotransmitter systems.

Summary:

• The metasympathetic system, located in visceral organ walls (e.g., heart, gut), exhibits functional autonomy.
• It connects to higher centers via sympathetic and parasympathetic pathways, not directly.
• This system includes sensory neurons, oscillators, interneurons, and tonic neurons, forming integrated organ-wide networks with excitatory ('driver-follower') and inhibitory interactions, utilizing unique purinergic transmission alongside cholinergic and adrenergic systems.

Impact:

• Provides a more comprehensive understanding of autonomic nervous system organization and function.
• Highlights the independent regulatory capabilities of visceral organs.
• Suggests novel therapeutic targets for conditions involving visceral organ motility and function.