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Related Concept Videos

Neural Control of Respiration01:18

Neural Control of Respiration

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The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
Respiratory Centers in the Brainstem
Two primary areas comprise the respiratory center: the medullary respiratory center in the medulla oblongata and the pontine respiratory group in the pons. The...
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Physiology of Respiration II: Neurogenic Control of Respiration01:22

Physiology of Respiration II: Neurogenic Control of Respiration

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The neurogenic control of respiration coordinates various neural networks and pathways to regulate breathing rate and depth, meeting the body's oxygen and carbon dioxide exchange requirements. This system adapts to physiological and environmental conditions, ensuring optimal breathing patterns.
Central Control
The brainstem is the primary site of central control, hosting respiratory centers:
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Gross Anatomy of the Lungs01:17

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The lungs are a pair of vital organs connected to the trachea via the left and right bronchi. The base of these organs meets the dome-shaped muscle known as the diaphragm. Encased by the pleurae, the lungs contact the mediastinum. The right lung is shorter yet wider, and has a larger volume than the left lung. The left lung has an indentation known as the cardiac notch. The superior region of the lungs is referred to as the apex, whereas the base is the lower region near the diaphragm. The...
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Physiological Control of Respiration01:23

Physiological Control of Respiration

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
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Brainstem: Control Centers of Medulla01:21

Brainstem: Control Centers of Medulla

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The medulla oblongata is a crucial part of the brainstem responsible for controlling various autonomic and involuntary functions. It contains several nuclei, including the olivary, cuneate, gracile, and solitary nuclei.
Olivary Nucleus
The olivary nucleus, or inferior olivary nucleus, is located within the ventrolateral part of the medulla oblongata. It is primarily involved in motor coordination and motor learning. The olivary nucleus receives input from the spinal cord, cerebellum, and motor...
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Other Factors Affecting Respiration Centers01:17

Other Factors Affecting Respiration Centers

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Breathing is primarily an involuntary activity regulated by the brainstem respiratory centers. However, it can also be consciously controlled, allowing us to hold our breath or take deeper breaths when needed. This voluntary control is facilitated by the cerebral motor cortex, which bypasses the medullary centers to stimulate the respiratory muscles directly.
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Related Experiment Video

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A Method to Target and Isolate Airway-innervating Sensory Neurons in Mice
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Vagal Sensory Neuron Subtypes that Differentially Control Breathing.

Rui B Chang1, David E Strochlic1, Erika K Williams1

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Cell
|April 21, 2015
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Summary

Researchers discovered two distinct vagus nerve neuron groups in mice that control breathing. One group (P2ry1) stops breathing, while the other (Npy2r) causes rapid, shallow breaths, revealing specific neural pathways for respiration.

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Area of Science:

  • Neuroscience
  • Respiratory Physiology
  • Autonomic Nervous System Research

Background:

  • Breathing is vital for survival and precisely regulated by neural circuits.
  • The vagus nerve is a critical communication pathway between the lungs and the brain for respiratory control.

Purpose of the Study:

  • To identify and characterize distinct neuronal populations within the mouse vagus nerve that influence respiratory function.
  • To elucidate the anatomical connections and physiological roles of these identified vagal afferent neurons.

Main Methods:

  • Utilized genetically guided anatomical mapping to trace vagal afferent projections in mice.
  • Employed optogenetics to stimulate specific neuronal populations (P2ry1 and Npy2r) and observe effects on respiration.
  • Differentiated neuronal subtypes based on fiber conduction velocity (A fibers vs. C fibers) and cellular targets.

Main Results:

  • Identified two distinct vagal afferent populations: P2ry1 (largely fast-conducting A fibers) and Npy2r (largely slow-conducting C fibers).
  • P2ry1 neurons innervate pulmonary endocrine cells and their stimulation acutely silences respiration, causing exhalation arrest.
  • Npy2r neuron stimulation results in rapid, shallow breathing; neither population affected heart rate or gastric pressure.

Conclusions:

  • The vagus nerve comprises genetically definable, intermingled sensory neurons acting as distinct labeled lines for respiratory control.
  • These neuronal populations possess unique anatomical targets and exert opposing physiological effects on breathing.
  • This discovery provides a refined understanding of neural regulation of respiration via specific vagal pathways.