Two students , Vineet and Kamlesh were asked to demonstrate the role of sinus nerve in hypovolemic shock in dogs. Vineet severed the sinus nerve when the mean blood pressure (MBP) was 85 mm Hg and Kamlesh cut the sinus nerve when the mean blood pressure was 60 mm Hg. On cutting the sinus nerve:

Baroreceptors responds to changes in BP and are involved in the rapid control of B.P. The afferent fibers from the carotid sinus is carried by sinus nerve a branch of 9th cranial nerve and afferent fibers from aoic body is carried by aoic nerve branch of 10th cranial nerve. When the sinus nerve is severed, the inhibitory effect of baroreceptor on the vasomotor center is taken off. As a result the vasoconstrictor area in the vasomotor center is activated which result in increase in the tone of blood vessels which will raise the BP. Ref: Textbook of Anatomy and Physiology for Nurses By Ashalata, Page 393.