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 electron 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. Afferent nerve fibers and terminals are found at approximately the same time that sensory cells are being differentiated; the efferent synapses appear latter in development. The maturation of the both types of synapses is described.