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Related Concept Videos

Spinal Nerves: Plexus I01:22

Spinal Nerves: Plexus I

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Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
The Cervical Plexus
The cervical plexus, formed by the anterior rami of the first four...
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Spinal Nerves: Plexus II01:21

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The plexuses of the lower body include the lumbar, sacral, and coccygeal plexuses, which innervate the abdomen, pelvis, legs, and coccygeal region. These plexuses control the transmission of sensory information and coordinate motor functions of the lower body.
The Lumbar Plexus
The lumbar plexus is situated within the lumbar region of the back and is primarily formed by the first four lumbar spinal nerves (L1 to L4). This plexus extends its branches into several nerves, including the...
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Block Diagram Reduction01:22

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The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
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Elements of Block Diagrams01:25

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Block diagrams serve as a visual representation of the input-output relationships within a system. An illustrative example is a heating system, where the set temperature activates the furnace to warm the room to the desired level. Block diagrams are versatile, modeling linear systems through Laplace transform variables and nonlinear systems using time domain variables.
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Relation between Mathematical Equations and Block Diagrams01:20

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In a spring-mass-damper system, the second-order differential equation describes the dynamic behavior of the system. When transformed into the Laplace domain under zero initial conditions, this equation can be effectively analyzed and manipulated. The transformation into the Laplace domain converts differential equations into algebraic equations, simplifying the process of isolating the output.
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Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia01:30

Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia

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Depending on the target organ, local anesthetics (LAs) can be administered via various routes. In surface anesthesia, LAs are applied directly to the surface of the skin or mucous membranes. It is widely used for topical skin numbing before venipuncture or minor surgical procedures. Commonly used surface local anesthetics are lidocaine or benzocaine sprays or creams. Surface anesthesia occurs within 5 minutes and lasts for about 60 minutes. One of the main disadvantages of topical anesthesia is...
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Related Experiment Video

Updated: Feb 8, 2026

Ethanol-Induced Cervical Sympathetic Ganglion Block Applications for Promoting Canine Inferior Alveolar Nerve Regeneration Using an Artificial Nerve
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Cervical plexus block.

Jin-Soo Kim1, Justin Sangwook Ko2, Seunguk Bang3

  • 1Department of Anesthesiology and Pain Medicine, Ajou University College of Medicine, Suwon, Korea.

Korean Journal of Anesthesiology
|July 5, 2018
PubMed
Summary

Cervical plexus blocks (CPBs) offer anesthesia for head and neck surgeries. This review clarifies CPB techniques, focusing on ultrasound guidance and addressing controversies surrounding intermediate blocks for improved safety and efficacy.

Keywords:
Cervical fasciaCervical plexusCervical plexus blockPhrenic nerve palsyUltrasonographyAirway obstruction

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Area of Science:

  • Anesthesiology
  • Regional Anesthesia
  • Anatomy

Background:

  • Cervical plexus blocks (CPBs) are vital for head and neck surgery anesthesia.
  • The narrow neck anatomy presents challenges due to sensitive structures and complex innervation.
  • Introduction of intermediate CPBs has led to nomenclature and definition confusion.

Purpose of the Study:

  • To review conventional deep and superficial CPB methods and applications.
  • To discuss controversies of intermediate CPBs, including nomenclature and potential adverse effects.
  • To refine CPB classification based on ultrasound-identified target compartments.

Main Methods:

  • Review of existing literature on cervical plexus block techniques.
  • Emphasis on ultrasound-guided approaches for enhanced safety and accuracy.
  • Detailed anatomical discussion of cervical fascial layers and plexus innervation.

Main Results:

  • Ultrasound guidance improves safety and accuracy of CPBs.
  • Clarification of nomenclature and definitions for various CPB types is needed.
  • Understanding fascial planes is crucial for effective and safe block performance.

Conclusions:

  • Standardized nomenclature and clear definitions for CPBs are essential.
  • Ultrasound-guided techniques offer significant advantages for CPB performance.
  • A refined classification based on target compartments will aid clinical application and understanding.