The innervation of the rabbit cornea was investigated histochemically and electron-microscopically with.special reference to the autonomic nerves. Both formaldehyde- and glyoxylic-acid-induced fluorescence methods revealed adrenergic nerves in the stroma; a few fibres were also observed between the basal epithelial cells near the limbus. Acetylcholinesterase-(AChE-)positive nerves were found both in the stroma and in the epithelium, whereas nonspecific cholinesterase (NsChE) activity appeared only in the stromal nerves. Under the electron microscope, both AChE and NsChE activities were observed to be located in the axon membranes. A weak NsChE reaction also appeared in the Schwann cells. When the specimens fixed with KMn04 were examined under the electron microscope, most nerve fibres did not contain any special axoplasmic structures, although several axons contained mitochondria. Moreover, two vesicle-containing axon types were found in the stromal nerves; axons with small granular vesicles and axons containing small agranular vesicles. In the epithelium, two types of fibres were observed; one type contained only mitochondria while the other showed both agranular vesicles and mitochondria.

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