Ultrastructural studies of the peripheral extensions (Dendrites) of type I ganglion cells in the cat

Marcos V. Goycoolea*, Paul Stypulkowski, David C. Muchow

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

An ultrastructural study of peripheral extensions (dendrites) of type I ganglion cells in seven healthy adult cats and one cat that underwent bilateral cochlear injection of neomycin was undertaken. Morphologic evidence revealed that the peripheral process (dendrite) consistently has a smaller diameter than the central process. As the dendrite reaches the cell body, there is a constricted segment with a length that ranges from 10 to 30 μm, and a diameter of 0.5 μm. This region is covered by a continuous myelin sheath that does not thin. The central process (axon) does not have a corresponding constriction, and consists of a myelin covered, smoothly tapered segment that extends to the first axonal node of Ranvier. In the deafened cat, some cell bodies of the surviving ganglion cells appeared to have a residual portion of dendrite. These morphologic characteristics might have physiologic implications both in the mechanisms of normal hearing and in cochlear implantation.

Original languageEnglish
Pages (from-to)19-24
Number of pages6
JournalLaryngoscope
Volume100
Issue number2
DOIs
StatePublished - Feb 1990
Externally publishedYes

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