Fig. 1.
Photomicrographic montage demonstrating the location of orexin-A immunoreactive neurons within the hypothalamus of the giraffe showing the distinct magnocellular neurons as the main cluster (Mc), the zona incerta cluster (Zic) and the optic tract cluster (Otc) and the parvocellular neurons (Pvc) as a cluster in the medial hypothalamus. Medial is to the left, dorsal to the top. Scale bar = 1 mm. 3V – third ventricle; PC – cerebral peduncle.