[Localization of nitric oxide synthase in the chicken vestibular system].

OBJECTIVE

To locate nitric oxide synthase (NOS) in the chicken vestibular system.

METHOD

The frozen section were processed for NADPH-d histochemistry in a solution containing NADPH and nitroblue tetnazolium (NBT) to demonstrate NOS positive reactivity.

RESULT

NOS positive staining, black-blue in color, was seen at the nerve ending, nerve fibers of the utricul and saculla and ampiculium. Ganglion cells had different activity. The shape of the cells seems to be round or oral.

CONCLUSION

Collectively, data indicate the presence of active NOS in these tissue and suggest modulation of vestibular neurotransmission by nitric oxide.