Vomiting centre is situated in which part of brain?
The area postrema (AP) has been implicated as a chemoreceptor trigger zone for vomiting (emesis) for over 40 years. The AP is located on the dorsal surface of the medulla oblongata at the caudal end of the fourth ventricle. It is one of the so-called circumventricular organs that serve as an interface between the brain parenchyma and the cerebrospinal ﬂuid (CSF)- containing ventricles. The AP lacks a speciﬁc blood-brain diﬀusion barrier to large polar molecules  (i.e., a “blood-brain barrier”) and is thus anatomically positioned to detect emetic toxins in the blood  as well as in the CSF. 
The NTS (nucleus of the solitary tract) may serve as the beginning of a ﬁnal common pathway by which diﬀerent emetic inputs trigger vomiting.
Hypothalamus
Amygdala
Pons
Medulla