Somatic Nervous System
Somatic Nervous System - Related Videos
26:22
Homarus Americanus Stomatogastric Nervous System Dissection
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Cited by 3 •
2009
We describe the fine dissection of the stomatogastric nervous system from the stomach of the American lobster (Homarus americanus).
07:06
Tissue Regeneration with Somatic Stem Cells
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2023
Somatic or adult stem cells, like embryonic stem cells, are capable of self-renewal but demonstrate a restricted differentiation potential. Nonetheless, these cells are crucial to homeostatic processes and play an important role in tissue repair. By studying and manipulating this cell population, scientist may be able to develop new regenerative therapies for injuries and diseases. This video first defines somatic stem cells, and then explores the role these cells play in tissue regeneration.
18:37
Cancer Borealis Stomatogastric Nervous System Dissection
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Cited by 103 •
2009
The stomatogastric nervous system (STNS) of the Jonah crab (C. borealis) can be used for electrophysiology, immunohistochemistry, and cell culture studies. The STNS extraction is done in two parts: the gross and fine dissection.
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...
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,...
FAQs
Local anesthetics interrupt sensory signaling by blocking voltage-gated sodium channels. Because these channels support signal transmission along sensory neurons, their inhibition reduces the passage of information toward the central nervous system. This mechanism explains their role in anesthesia and pain management, where limiting sensory input can reduce pain perception during relevant clinical interventions.
Nicotinic receptors mediate the response to acetylcholine released at the neuromuscular junction. Their activation connects motor-neuron signaling with skeletal muscle contraction, making them a key pharmacological site for studying motor transmission. Drugs that interfere with this step can reduce the ability of neural signals to produce movement or muscle activity.
Afferent sensory neurons carry information toward the central nervous system, whereas efferent motor neurons direct signals toward skeletal muscle. This directional organization allows pharmacology to distinguish between reducing sensory transmission with local anesthetics and inhibiting motor transmission with neuromuscular blocking drugs. The distinction helps relate a drug effect to pain control or muscle relaxation.
The two drug classes act at different stages of somatic signaling. Local anesthetics block voltage-gated sodium channels and interrupt sensory signaling, while neuromuscular blocking drugs inhibit motor transmission at the neuromuscular junction. Consequently, one approach primarily addresses incoming sensory information, whereas the other affects the pathway that activates skeletal muscle.
These mechanisms are relevant whenever clinical care requires reduced sensory signaling or controlled skeletal muscle activity. Local anesthetic sodium-channel blockade supports anesthesia and pain management by interrupting sensory information. Understanding the separate motor pathway also clarifies why neuromuscular blocking drugs are used in surgical procedures when inhibition of muscle activation is needed.
Pharmacology uses the somatic nervous system as a framework for examining how altered sensory signaling, motor transmission, or neuromuscular communication may affect function. Local anesthetics provide a model for interrupting sensory pathways, while neuromuscular blockers probe motor transmission. These drug effects support research on disorders involving nerves, skeletal muscles, or their connection.