<prompt> Major neurotransmitter in afferents in nucleus tractus solitarius to regulate cardiovascular system ?SerotoxinGlutamateGlycineNorepinephrine  <response>: Ans. is b i.e., GlutamateNucleus tractus solitarius NTS lies in medulla.It receives following afferents :?A General visceral afferentsi From tonsil, pharynx, posterior pa of tongue, carotid body and sinus - through glossopharyngeal nerve.ii From pharynx, larynx, trachea, esophagus, and other thoracic and abdominal viscera - through vagus nerve.B Special visceral afferentsi From anterior 23 of tongue except circumvallate papillae and palate - through facial nerveii From posterior 13 of tongue including circumvallate papillae - through glossopharyngeal nerve.iii From posterior most pa of tongue and epiglottis - through vagus nerve.NTS is involved in regulation of cardiovascular system through baroreceptors and chemoreceptors.There is a general consensus that glutamate is the neurotransmitter released at the therminals of baroreceptor and chemoreceptor afferents in NTS. -- 