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19 Cards in this Set

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