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The ganglion spirale cochleae
... THE JOURNAL OF CELL BIOLOGY • VOLUME lO~, 196~ means of phase contrast microscopy of 1 to 2 sections shows that they bear a strong resemblance to dorsal root ganglia of the same species except for the presence of thin myelin around the cell bodies. The perikarya are spheroidal and closely packed together as noted previously (55). No greatly elongated cell bodies invested with thick compact myelin occur here as they do in the eighth nerve ganglion of the goldfish (38). ...
Nerve cell bodies in the spiral and vestibular ganglia of the adult rat are surrounded by thin (about ten lamellae) myelin sheaths which differ in several respects from typical axonal myelin. In some instances lamellae surrounding perikarya appear as typical major dense lines, and in others as thin Schwann cell sheets in which cytoplasm persists. Discontinuities and irregularities appear in the structure of perikaryal myelin. Lamellae may terminate anywhere within the sheaths; they may bifurcate; they may reverse their direction; or they may merge with each other. The number of lamellae varies from one part of a sheath to another. In addition, the myelin of a single perikaryal sheath may receive contributions from more than one Schwann cell, which overlap and interleave with each other. The ganglion cells are of two types: those which are densely packed with the usual cytoplasmic organelles but have few neurofilaments (granular neurons), and those which exhibit large areas containing few organelles but have a high concentration of neurofilaments (filamented neurons). The latter cell type is ensheathed by myelin which is generally more compact that that surrounding the former. The formation and the physiologic significance of perikaryal myelin are discussed.
- McCrady
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