Symposium on the Role of the Vestibular Organs in Space Exploration (1970) / Chapter Skim
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THE FIRST-ORDER VESTIBULAR NEURON
THE FIRST-ORDER VESTIBULAR NEURON
Pages 123-136
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From page 123... ...
6) , and others, it has been shown that all vestibular sensory epithelia have two kinds of sensory cells, called type I and type II.
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fibers end at the surface of the type II cell, but at the surface of the calyx around the type I cell. FIGURE 3. -- Schematic drawing of sensory cells and stato-"*
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From page 125... ...
FIGURE 1. -- Detail from the previous figure showing the sen^ sory hnirs on one cell. The scanning electron microscope gives an excellent method for the study of the vestibular sensory regions, and we have also used it extensively now for a study of the cochlea.
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From page 126... ...
. The peripheral sensory cells and the contact between the peripheral terminations of the vestibular nerve fibers have been carefully studied with the aid of electron microscopy (figs.
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between the nerve calyx and the type II cell. Squirrel monkey, macula utriculi.
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' FIGURE 13. -- Afferent nerve fiber at a macula utriculi below the epithelium.
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He wrote of magnocellular and parvicellular regions. The various sensory regions of the vestibular labyrinth, according to FIGURE 18. -- A, B, C, and D are found between sensory cells and afferent nerve endings.
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From page 130... ...
It has been stated that the afferent fibers of the vestibular nerve are myelinated and their bipolar ganglion cells are also surrounded by a myelin sheath. That cochlear and vestibular ganglion cells have a myelin coating has been known for a long time.
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From page 131... ...
This matter is now being studied in embryological material. It is, however, quite clear that there exist two distinctly separate types of ganglion cells in the vestibular ganglion as has been found earlier in the cochlear ganglion.
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FIGURE 25. -- Very thick myelin sheath around a vestibular nerve fiber.
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Sometimes the same fiber may innervate both type I and type II cells. The innervation of type II cells seems to be mainly by mediumsized or thin fibers.
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21. WlNTHER, F.: Acute Degenerative Changes in the Inner Ear Sensory Cells of the Guinea Pig Following Local X-Ray Irradiation.
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From page 135... ...
But down along the sides, Lindeman has counted up to 10 cells innervated by one nerve fiber; therefore, one medium-sized nerve fiber at the slope of the crista is innervating 10 sensory cells of type I I might mention also, as I have earlier, that a type I nerve fiber may innervate a type II cell.
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