The ultrastructure of the large granular vesicles of the frog's habenula.
Two types of large granular vesicles in the habenular nuclei of the frog Rana esculenta following aldehyde fixation are described. One type is almost completely filled by a dense droplet. The other type contains a globular substructure. Both satisfy the morphological criteria for neurosecretory granules.
Kemali
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Laboratorio di Cibernetica del C.N.R., 80072 Arco Felice, Naples, and Stazione Zoologica, Naples Italy.