Abstract
The structure of an anterior neurohemal area in the chiasmatic region of the diencephalic floor in the hagfish, Polistotrema stoutii, has been studied by light and electron microscopy, and compared with that of the neurohypophysis. This region, from which blood is carried to the neurohypophysis by a portal system described first by Gorbman and collaborators, has much in common with the median eminence of tetrapods: location, paraldehyde-fuchsin stainability, and axon terminals containing small vesicles, despite the absence of a relation with the adenohypophysis.
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