I got this one wrong because I didn't know the difference between the area postrema and the OVLT, since both are not covered by the BBB and exposed to the contents in circulation, so I thought both can cause vomiting.
But apparently the OVLT are osmoreceptor responding to sodium content and the osmotic pressure through regulating the activity of ADH, while the area postrema is the vomiting center, responding to the visceral afferent input from CN IX and CN X.
Another small detail that the test makers could test, make sure that you know the area of postrema is found in the (dorsal medulla). This is the area in which it responds to anti-emetics (e.g. Ondansetron).
submitted by โhiroshimi(26)
I got this one wrong because I didn't know the difference between the area postrema and the OVLT, since both are not covered by the BBB and exposed to the contents in circulation, so I thought both can cause vomiting.
But apparently the OVLT are osmoreceptor responding to sodium content and the osmotic pressure through regulating the activity of ADH, while the area postrema is the vomiting center, responding to the visceral afferent input from CN IX and CN X.
a short reading on wiki here explaining the role of OVLT