Supraependymal cells in the third ventricle of Poecilia sphenops.

The ependymal surface of the third ventricle in the hypothalamus of the black molly (Poecilia sphenops) was examined by scanning electron microscopy. Supraependymal cells were observed and could be categorized generally into two varieties, Types 1 and 2. P. sphenops is a representative of the teleostean family Poeciliidae which has been utilized as an effective neuroendocrine model. The presence of supraependymal cells in the hypothalamus ventricular space must be considered in future studies on hypothalamic-pituitary interaction.