Ultrastructural features of supramedullary neurons in Crenilabrus quinquemaculatus

The ultrastructural study of the supramedullary neurons in Crenilabrus quinquemaculatus shows that these cells are engaged in intense synthetic activity as is testified by the nuclear morphology, the plentiful rough endoplasmic reticulum and polysomes, and finally the remarkably developed Golgi complexes, many of them active. Moreover the cytoplasm of the supramedullary neurons shows numerous membrane-bounded bodies (1,800-4,000 A) containing electron dense material, more or less finely granular. Research is presently being carried out to establish the meaning of these electron dense bodies.