Two respiratory nuclei in medulla oblongata Inspiratory center(dorsal respiratory gtOupR more frequently they fire, more deeply you, inhale longer duration they fire, breath is prolonged slow rate Expiratory center(ventral respiratory group, VRG involved in forced Pneumotaxic center expiration pneustic center Respiratory Dorsal respiratory Medullary group center in brain stem center group
6 Two respiratory nuclei in medulla oblongata Expiratory center (ventral respiratory group, VRG) •involved in forced expiration Inspiratory center (dorsal respiratory group, DRG) • more frequently they fire, more deeply you inhale • longer duration they fire, breath is prolonged, slow rate
Respiratory Centers in pons Pneumotaxic center (upper pons) Sends continual inhibitory impulses to inspirator center of the medulla oblongata As impulse frequency rises. breathe faster and Shallower Apneustic center (lower pons Stimulation causes apneusis Integrates inspiratory cutoff information Pneumotaxic center Apneustic center Dorsal respiratory Medullary group in respiratory ventral respiratory brain stem center
7 Respiratory Centers in Pons Apneustic center (lower pons) •Sends continual inhibitory impulses to inspiratory center of the medulla oblongata, •As impulse frequency rises, breathe faster and shallower •Stimulation causes apneusis •Integrates inspiratory cutoff information Pneumotaxic center (upper pons)
Respiratory Structures in Brainstem Cerebri H potharamus Pneumotaxic center cHEM。 RECEPTORS Pons Apneustic center medulla ngata chearorsce carotid and aortic sinuses N D。sa aspirate。n Respirat。r Spinal Ventral rhythmicity enters respirator notor neurons controlling diaphragm Stimulati。n Inhibition Motor neurons Diaphragm Phrenic nerve
8 Respiratory Structures in Brainstem
2. Rhythmic Ventilation (Inspiratory Off Switeh)- Starting inspiration Medullary respiratory center neurons/are continuously active(spontaneous) Center receives stimulation from Peripheral and central receptors brain concerned with voluntary respiratory movements and emotion Combined input from all sources causes action potentials to stimulate respiratory muscles
9 2. Rhythmic Ventilation (Inspiratory Off Switch) • Starting inspiration – Medullary respiratory center neurons are continuously active (spontaneous) – Center receives stimulation from –Peripheral and central receptors –brain concerned with voluntary respiratory movements and emotion – Combined input from all sources causes action potentials to stimulate respiratory muscles
Increasing inspiration More and more neurons are activated Stopping inspiration -Neurons receive input from pontine group and stretch receptors in lungs -Inhibitory neurons activated and relaxation of respiratory muscles results in expiration Inspiratory off switch 10
10 •Increasing inspiration –More and more neurons are activated •Stopping inspiration –Neurons receive input from pontine group and stretch receptors in lungs. –Inhibitory neurons activated and relaxation of respiratory muscles results in expiration. –Inspiratory off switch