Bainbridge Reflex

*Another name- Cardioacceleratory reflex.

* Described by Bainbridge in 1915

*Description : When venous pressure increase, the nerve ending of the wall of the right atrium & the wall of the vena cavae are stimulated.The afferent fibres ascend in the vagus to the medulla oblongata & terminate on the nucleus of the tractus solitarius . Connector neurons inhibit the parasympathetic nucleus(dorsal) of the vagus,& reticulospinal fibres stimulate the thoracic sympathetic outflow to thw heart,resulting in cardiac acceleration. 

*This reflex compets with the Baroreceptor-mediated decrease in heart rate produced by volume expansion.

***There has been much debate about its significance,and its physiologic role remains unsetted.

Collected & Concise only for postgraduate student