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Organization of the Nervous System

Organization of the Nervous System

The nervous system is one of the most complex systems in our body. It is organized into two main divisions: the central nervous system (CNS) and the peripheral nervous system (PNS).
The CNS, comprising the brain and spinal cord, houses billions of neurons. The brain is housed in the skull, while the spinal cord is linked to the brain through the foramen magnum of the occipital bone and is surrounded by the protective structure of the vertebral column. It is responsible for processing various...

Peripheral Nervous System: Ganglia and Nerves

Peripheral Nervous System: Ganglia and Nerves

The Peripheral Nervous System (PNS) is a crucial component of the body's neural network, extending beyond the central nervous system (CNS) to bridge the gap between the CNS and the external environment. It encompasses nerves, ganglia, and sensory receptors.
Nerves
The nerve is a bundle of axons that serves as the communication highway in the PNS. Each nerve is ensheathed in a protective layer of connective tissue called the epineurium. This outermost layer safeguards the nerve and supports the...

Nervous System

Nervous System

The nervous system coordinates body functions through its complex network of nerve cells, enabling sensation and movement. It is divided into two primary parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is composed of the brain and the spinal cord. The brain acts as the body's control center, processing sensory information and coordinating responses. The spinal cord functions as a major signaling pathway for the brain and the rest of the body.

What is a Nervous System?

What is a Nervous System?

Functional Divisions of the Nervous System

Functional Divisions of the Nervous System

The nervous system, responsible for sensing, integrating, and responding to various stimuli, is divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The PNS has two functional divisions: the sensory or afferent division and the motor or efferent division.
The sensory division transmits information from sensory receptors in the body to the CNS. It provides the CNS with knowledge about somatic senses (such as tactile, thermal, pain, and proprioceptive sensations)...

Autonomic Nervous System: Overview

Autonomic Nervous System: Overview

The human nervous system is divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is composed of the brain and spinal cord, while the PNS contains nerve cells, clusters of nerve cells, and the sensory receptors that are outside the CNS. The PNS has two types of nerve cells: sensory (afferent) and motor (efferent). Sensory cells send signals to the CNS from receptors, and motor cells carry signals from the CNS to organs, muscles, and...

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Related Experiment Video

Updated: Jul 30, 2025

The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals

The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals

Published on: January 13, 2022

The peripheral nervous system.

Aliia Murtazina¹, Igor Adameyko^1,2

¹Department of Physiology and Pharmacology, Karolinska Institutet, 17177 Stockholm, Sweden.

Development (Cambridge, England)

|May 12, 2023

Summary

The peripheral nervous system (PNS) is diverse, controlling bodily functions and development. Recent single-cell transcriptomics reveals new neuronal subtypes and developmental origins, advancing PNS research.

Keywords:

Nervous system development Neural crest Peripheral innervation Peripheral nervous system Placodes Schwann cell precursor

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Last Updated: Jul 30, 2025

The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals

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Published on: January 13, 2022

Traumatic Peripheral Nerve Injury in Mice

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Motor Nerve Transection and Time-lapse Imaging of Glial Cell Behaviors in Live Zebrafish

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Published on: June 20, 2013

Area of Science:

Neuroscience
Developmental Biology
Cell Biology

Background:

The peripheral nervous system (PNS) is a complex network essential for brain-body communication, development, and regeneration.
It comprises sensory, motor, autonomic, and enteric domains, each with distinct neuronal types.
Understanding PNS heterogeneity is crucial for comprehending its multifaceted roles.

Purpose of the Study:

To review the diverse functions and domains of the peripheral nervous system.
To highlight recent advancements in understanding PNS development, cell origins, and neuronal heterogeneity.
To provide an outlook on future research directions and ongoing debates in PNS science.

Main Methods:

Review of current literature on peripheral nervous system research.
Integration of findings from single-cell transcriptomics studies.
Analysis of developmental mechanisms and cell-type classifications.

Main Results:

Single-cell transcriptomics has identified novel neuronal subtypes within the PNS.
Diverse embryonic strategies, including neural crest and placodal cells, contribute to PNS development.
The PNS exhibits significant heterogeneity across its sensory, motor, autonomic, and enteric domains.

Conclusions:

The PNS is a highly heterogeneous system with critical roles in various physiological processes.
Recent advances have significantly improved our understanding of PNS cellular diversity and developmental origins.
Future research will likely focus on further unraveling PNS complexity and its implications for health and disease.