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Morphological Studies of the Vestibular Nerve Morphological Studies of the Vestibular Nerve

CONTENTS A. INTRODUCTION 7 B. SURVEY OF LITERATURE 9 1. Topographic and gross anatomy of the peripheral vesti-bular system 9 2. The vestibular sensory epithelium 11 a. Structure of the sensory cells b. Morphological polarization c. Functional polarization and physiological significance 3. The vestibular nerve 15 a. The afferent vestibular nerve fibers b. The vestibular ganglion 1. Morphology of the vestibular ganglion 2. Tonotopic organization of the vestibular ganglion c. Central distribution of vestibular nerve fibers d. Efferent fibers to the inner ear e. Adrenergic innervation of the inner ear 4. Numerical studies of vestibular nerve fibers, ganglion cells and sensory elements. Age related changes 22 C. OBSERVATIONS 25 I. Anatomical studies of the vestibular nerve in man 25 II. The number of myelinated vestibular nerve fibers in man at various ages 26 III. Analysis of the calibers of the myelinated vestibular nerve fibers in man at various ages 27 IV. Macula utriculi and macula sacculi in the squirrel monkey 27