Fig. 5.
Photomicrographs illustrating the neuronal morphological differences between the magnocellular and parvocellular clusters of orexin-A immunoreactive nuclear groups within the hypothalamus of the harbour porpoise. (A) Orexin-A immunoreactive neurons of the parvocellular cluster in the medial hypothalamus. (B) Orexin-A immunoreactive neurons of the magnocellular main cluster in the perifornical region. (C) Orexin-A immunoreactive neurons of the magnocellular zona incerta cluster in the lateral hypothalamic area. In all images medial is to the left and dorsal to the top. Scale bar in C = 500 μm and applies to all.