NEET PG Medical – 2019 – Question – 27
In forceful expiration, which of the following neurons gets fired?
a) VRG
b) DRG
c) Pneumotaxic centre
d) Chemoreceptors
Show Answer
Correct Answer – A
Ans: A. VRG
Medullary respiratory group:
- Principal areas in medulla oblongata concerned with respiratory regulation.
Includes, - Dorsal respiratory group (DRG).
- Ventral respiratory group (VRG).
- Pre-Botzinger complex.
- Peripheral inputs.
Dorsal respiratory group (DRG):
DRG neurons – - Mainly concerned with inspiration.
- Descend & terminate on spinal motor neurons innervating primary inspiratory muscles.
- I.e., Diaphragm & External intercostal muscles.
Ventral respiratory group (VRG):
VRG neurons – - Mainly concerned with forceful expiration.
- Minimal activities w.r.t inspiration.
- Contributes to both expiration & inspiration.
