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19 Cards in this Set
- Front
- Back
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What are the different types of respiratory motor control?
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1.Ventral resp. group
2.Dorsal resp. group 3. Pontine resp. group |
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WHat constitutes the Ventral resp. group?
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-Pre Botzinger complex
-Botzinger complex -Rostral VRG -Nucleus ambiguous |
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Pre botzinger complex consists of
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Pacemaker neurons
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Botzinger complex comprises of
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Inhibitory interneurons to expiratory motor neurons.
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What does rostral VRG contain?
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Inspiratory motor neurons.
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Nucleus ambiguous is compact and subcompact.
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True
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Nucleus ambiguous involves motor neurons to larynx,pharynx,face.
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True
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What is the dorsal resp. group made of?
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Nucleus of tractus solitarius
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What does the NTS contain?
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Some inspiratory motor neurons to spinal cord and phrenic motor neurons + also processes afferent info.
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What is the Pontine resp. group made of?
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1. Nucleus Parabrachialis Medialis & Koliker-Fuse nucleus(pneumotaxic centre)
2. Lower pontine reticular formation.(apneustic centre) |
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What is the role of Pneumotaxic centre(upper pons)?
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Inhibits inspiratory premotor neurons and controls rate & depth of breathing.
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What is the role of the Apneustic centre?
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Tonic excitation of inspiratory premotor neurons(ablative lesions above here cause prolonged inspiratory gasps-apneustic breathing)
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Name the main type of resp. sensors
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-Central chemoreceptors
-Peripheral chemoreceptors -Lung and other receptors. |
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Dopamine inhibit discharge in carotid sinus nerve.
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True
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Pulm. stretch receptors---->
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-In a/w SM
-Stimulated by lung distension & increase exp. time and decrease insp. time -Prolonged exp -Increase depth and slowing of resp. -Afferent to pneumotaxic centre via vagus nerve. |
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Irritant receptors------>
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-On a/w mucosal surface
-Stimulated by dust,cold air,SO2 -leads to bronchoconstriction,hyperpnoea,cough,mucus secretion. |
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J receptors----->
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- In alv. walls close to capillaries
-Stimulated by distension of capillaries/parenchyma---> sensation of dyspnoea,rapid shallow breathing,bronchoconstriction. -Unmyelinated C-fibres. |
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What happens in Upper Airway and Nasal receptors?
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Causes sneezing,coughing,bronchoconstriction,apnoea,laryngeal spasm.
-VIP interactions between larynx and resp. centre |
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What is the gamma system?
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Reflex control of muscle contraction leading to sensation of dyspnoea when load/work increase.
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