Nervous Control of Respiration Dorsal Group of Neurons Ventral Group of Neurons Pneumotaxic Center Apneustic Center

Respiratory Control centers in the Brain Stem

Respiratory control centers

Dorsal Respiratory Group Generation of basic rhythm of respiration i.e. Ramp Signal Neurons are located with in the nucleus of tractus solitarius Role of Pre botzinger complex

Schematic representation of medullary dorsal respiratory group (DRG) control of inspration

Ventral respiratory group of Neurons Neurons are located in the mucleus ambiguus rostrally and the nucleus retroambiguus caudally Remains totally in active during normal quiet respiration Provide powerful expiratory signals to the abdominal muscles during very heavy expiration

Pneumotaxic Center Neurons are located dorsally in the nucleus parabrachialis of the upper pons Transmit signal to the dorsal respiratory group It controls the “switch-off ” point of the inspiratory ramp It primarily limits inspiration

Apneustic Center Is situated in the lower part of pons Sends signals to dorsal respiratory group of neurons to prevent the “Switch-off” of the inspiratory ramp signal. Controls intensity of inspiration