User:NicoBarfo
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Receptors on the floor of the fourth ventricle of the brain represent a chemoreceptor trigger zone, known as the area postrema, stimulation of which can lead to vomiting. The area postrema is a circumventricular organ and as such lies outside the blood-brain barrier; it can therefore be stimulated by blood-borne drugs that can stimulate vomiting or inhibit it.
![A Renaissance drawing with vivid colours depicting a woman holding the head of a man, who is bent over and expelling a brownish-red material from his mouth. A second woman stands at the left of the image in the doorway to the room, and appears to offer support. A crude representation of vomiting.](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e3/49-aspetti_di_vita_quotidiana%2C_vomito%2CTaccuino_Sanitatis%2C_Ca.jpg/640px-49-aspetti_di_vita_quotidiana%2C_vomito%2CTaccuino_Sanitatis%2C_Ca.jpg)