Peripheral Nervous System
Peripheral Nervous System - Related Videos
01:24
Peripheral Nervous System: Ganglia and Nerves
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2025
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...
01:25
What is a Nervous System?
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2019
Overview The nervous system is the collection of specialized cells responsible for maintaining an organism’s internal environment and coordinating the interaction of an organism with the external world—from the control of essential functions such as heart rate and breathing to the movement needed to escape danger. Parts of the Nervous System The vertebrate nervous system is divided into two major parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS...
09:11
Immunohistochemical Analysis in the Rat Central Nervous System and Peripheral Lymph Node Tissue Sections
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Cited by 8 •
2016
We here present an optimized, detailed protocol for double immunostaining in formalin-fixed, paraffin-embedded rat central nervous system (CNS) and peripheral lymph node (LN) tissue sections.
01:14
The Parasympathetic Nervous System
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2019
Overview The parasympathetic nervous system is one of the two major divisions of the autonomic nervous system. This parasympathetic system is responsible for regulating many unconscious functions, such as heart rate and digestion. It is composed of neurons located in both the brain and the peripheral nervous system that send their axons to target muscles, organs, and glands. The “Rest and Digest” System Activation of the parasympathetic system tends to have a relaxing effect on the body,...
01:25
The Sympathetic Nervous System
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2019
Overview The sympathetic nervous system—one of the two major divisions of the autonomic nervous system—is activated in times of stress. It prepares the body to meet the challenges of a demanding circumstance while inhibiting essential body functions—such as digestion—that are a lower priority at the moment. The “Fight or Flight” System As a student, you may have had the experience of walking into class and finding a surprise exam that you were not expecting. In the moment of realization, you...
FAQs
Afferent, or sensory, neurons carry information from sensory receptors toward the central nervous system, allowing it to detect internal and external conditions. Efferent, or motor, pathways transmit commands outward. This two-way organization lets the nervous system compare incoming information with appropriate responses, supporting both sensory awareness and coordinated control of movement or physiological activity.
Somatic circuits transmit motor commands to skeletal muscle and therefore support movement. Autonomic circuits regulate smooth muscle, cardiac muscle, and glands, contributing to physiological control. This distinction explains how the same broad communication network can participate in deliberate motor activity while also coordinating functions that maintain internal regulation without being described primarily as skeletal-muscle movement.
Nerves and ganglia provide the structural framework for examining how peripheral signals are arranged outside the brain and spinal cord. Studying this organization helps connect anatomical pathways with their signaling roles, including the movement of sensory information toward the central nervous system and motor commands toward muscles, organs, or glands.
Reflexes can be examined through the relationship between incoming sensory signals and outgoing motor responses. Sensory neurons provide information about a condition, while efferent pathways carry a resulting command toward an appropriate target. Investigating these linked pathways helps neuroscience explain how peripheral communication participates in rapid, coordinated responses without treating sensation and movement as separate systems.
Research commonly examines peripheral nervous system organization, signaling, injury, and repair. These areas connect structure with function by asking how pathways communicate, how damage affects that communication, and whether repair can restore it. Together, they provide a framework for interpreting peripheral contributions to movement, physiological regulation, sensory processing, and clinically relevant nerve dysfunction.
Because the peripheral nervous system carries sensory information and motor commands between the central nervous system and body tissues, disruption can affect communication in either direction. Studying such disruption supports investigation of neuropathies and nerve damage, while research on injury and repair can inform potential treatments aimed at improving impaired peripheral signaling.