Question

Which of the following pattern of responses would you expect following stimulation of the aortic depressor...

Which of the following pattern of responses would you expect following stimulation of the aortic depressor nerve?

Select one:

a. Decrease in sympathetic nerve activity, decrease in heart rate and decrease in blood pressure.

b. Increase in sympathetic nerve activity, decrease in heart rate and increase in blood pressure.

c. Increase in sympathetic nerve activity, increase in heart rate and increase in blood pressure.

d. Decrease in sympathetic nerve activity, increase in heart rate and decrease in blood pressure.

e. Decrease in sympathetic nerve activity, decrease in heart rate and increase in blood pressure.

Science   Anatomy-And-Physiology   
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Answer #1

Aortic depressor nerve is the nerve which carries afferents from the aortic arch baroreceptors. This is the other name of Vagus Nerve which innervates the aortic arch baroreceptors. They usually end in the Nucleus Tractus Solitarius of medulla. Projections from NTS terminate on the Depressor area of VMC and cardiac vagal center. Aortic depressor nerve is usually stimulated at high blood pressure. When the Aortic Depressor Nerve is stimulated, it sends information to NTS and from there to the higher centres. They stimulate the efferents of vagus nerve which supplies the heart and leads to decreased sympathetic discharge which causes decrease in heart rate and decrease in blood pressure. (Option A is the answer)

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