1. Control of Respiration
1. Medulla Oblongata
Sets the rhythmic pace of respiration.
- Dorsal Respiratory Group – inspiration.
- Ventral Respiratory Group – forced breathing.

2. 2. Pons (the Pontine respiratory centers)
For ‘fine tuning’ and protection of respiration.
Apneustic center
For strong, sustained inspiration.
Used for ‘overdrive’ when breathing deep.
Pneumotaxic center
Inhibits apneustic and inspiratory centers.
Sets limits to over inflation of lung.

4. Sensory Receptors - regulate respiration.
Mechanoreceptors
Detect changes in lung volume (inflation of lungs).
Chemoreceptors
Detect changes in PCO2, pH, PO2 of blood and CSF.

5. Central Chemoreceptors
in medulla oblongata
Peripheral Chemoreceptors
1) Aortic bodies (in aorta)
2) Carotid bodies (in carotids)

6. Central N.S. Peripheral Chemoreceptors Medulla Oblongata 1.  PCO22.
 pH 3.
 PO2
Diaphragm
PCO2
 Ventilation
 pH
 PO2

7. Carotid and Aortic bodies
detect changes in:
PCO2
[H+]
PO2
levels in arterial blood
Central Chemoreceptors in
Medulla detect changes in:
PCO2 levels in CSF.
* But do so via [H+] in CSF.