Audio LecturePro Feature Neural Control of Ventilation 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x Ventilation is the movement of air in and out of the lungs which facilitates gas exchange. It occurs via the respiratory muscles, which contract and relax rhythmically to fill the lungs with air during inspiration and empty them in expiration. This article will discuss the neural control of ventilation and its clinical relevance. 3D ModelPro Feature You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Involuntary control Involuntary respiration is under subconscious control. The diaphragm and intercostal muscles are the primary respiratory muscles. They are stimulated by groups of neurons located in the pons and medulla. These neurons form the respiratory control centre. They send impulses to the primary respiratory muscles, via the phrenic and intercostal nerves, which stimulate their contraction. There are three main groups of neurons involved in respiration: The dorsal respiratory group (DRG) controls inspiration The pontine respiratory group controls the rate and depth of breathing The ventral respiratory group (VRG) can control both inspiration and expiration, and is particularly important when increased respiratory drive is needed Once the inspiratory neurons from the DRG stop firing, the inspiratory muscles relax and expiration begins. Further information on the mechanics of breathing can be found here. By OpenStax College [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons Fig 1Diagram showing the respiratory centres of the brain. Voluntary Control Voluntary respiration is under conscious control. It is controlled via the motor cortex in the cerebrum, which receives inputs from the limbic system and hypothalamus. The mechanisms involved aren’t completely understood, but signals are thought to be sent to the spinal cord from the motor cortex, which are then passed onto the respiratory muscles. By CNX OpenStax [CC BY 4.0 (http://creativecommons.org/licenses/by/4.0)], via Wikimedia Commons Fig 2Regions of the brain, neurons in the motor cortex are responsible for voluntary control of respiration. Clinical Relevance Phrenic nerve paralysis Phrenic nerve paralysis is where damage to the phrenic nerve results in its dysfunction. This can cause paralysis of the diaphragm, therefore causing breathing problems. Patients may lose the ability to regulate their own breathing. Common causes include: spinal cord injury, neck injury and surgical complications. Do you think you’re ready? Take the quiz below QuizPro Feature Neural Control of Ventilation Question 1 of 3 Submitting... Skip Next Rate question: You scored 0% Skipped: 0/3 More Questions Available Upgrade to TeachMePhysiology Pro Challenge yourself with over 2100 multiple-choice questions to reinforce learning Learn More Frequent questions What is the role of the respiratory muscles in ventilation? The respiratory muscles, primarily the diaphragm and intercostal muscles, are essential for ventilation as they contract and relax to facilitate the movement of air in and out of the lungs. This rhythmic action enables gas exchange during inspiration and expiration. How is involuntary respiration controlled? Involuntary respiration is regulated by a respiratory control centre located in the pons and medulla, which sends impulses to the diaphragm and intercostal muscles via the phrenic and intercostal nerves. This process involves three main groups of neurons that control different aspects of breathing. What is the function of the dorsal respiratory group (DRG)? The dorsal respiratory group (DRG) primarily controls the process of inspiration by stimulating the inspiratory muscles. When the DRG neurons cease firing, it leads to muscle relaxation and the initiation of expiration. How does voluntary control of respiration differ from involuntary control? Voluntary control of respiration is managed by the motor cortex in the cerebrum, allowing conscious regulation of breathing. Unlike involuntary control, which is subconscious, voluntary control involves signals sent to the spinal cord that activate the respiratory muscles. What are the implications of phrenic nerve paralysis on breathing? Phrenic nerve paralysis impairs the function of the diaphragm, leading to significant breathing difficulties and loss of the ability to regulate respiration. This condition can arise from spinal cord injuries, neck injuries, or complications from surgery. Rate This Article