DEVELOPMENT OF THE INNER-EAR OF THE BROWN TROUT (SALMO-TRUTTA-FARIO) .2. CYTODIFFERENTIATION AND INNERVATION OF SENSORY CELLS

The study of the sensory organs of the trout labyrinth by means of ele ctron microscopy show that hair cells differentiate gradually in these organs; all of them produce new cells over a long period. The course of cytodifferentiation follows a similar pattern in all organs. Affere nt nerve fibers and terminals are found at approximately the same time that sensory cells are being differentiated; the efferent synapses ap pear latter in development. The maturation of the both types of synaps es is described.