Abstract
The fine structure of the vestibular ganglion cells in the macaque monkeys was studied with transmission electron microscope. Most cells were myelinated with compact myelin layers. The myelin sheath varied its thickness around one perikaryon. There was an alternating pattern of the perikaryal myelin between loose and compact lamellae. Over 400 serial sections showed that about 5% of the ganglion cells appeared unmyelinated without compact myelin layers. However, no remarkable ultrastructural differences were found between myelinated and umnyelinated perikarya.
