Abstract
Electron micrographs of tissue from developing and functional human periodontium from twelve teeth show the presence of unmyelinated and myelinated nerve fibres. The presence of vesicles and small mitochondria in the axons of the unmyelinated fibres suggests that these are nerve endings. The myelinated nerve fibres are of uniform fine diameter corresponding to the Group III category. They are seen to terminate, after losing their myelin lamellae, as axonal swellings covered by basement membrane and exposed to the ground substance. Electron-dense bodies, vesicles and mitochondria are present.
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