Figure 4.

Effects of microinjections of melanocortin receptor agonists into the mNTS on gastric activity. Representative tracings illustrating the effects of microinjections of l-glutamate (A, B), MT-II (A), and α-MSH (B) into the mNTS after ipsilateral vagotomy. C, Representative photomicrograph of a pipette track (top) whose tip location (arrow) resides in the mNTS. Similar tip locations are depicted in the camera lucida drawing (bottom) for unilateral microinjection sites in the mNTS for 20 pmol of MT-II (black dots; n = 7), 100 pmol of α-MSH (white dots; n = 5), and saline vehicle (black squares; n = 3). XII, Hypoglossal nucleus; AP, area postrema; CC, central canal.