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  • Title: Immunohistochemical localization of neuropeptides in the human ciliary ganglion.
    Author: Kirch W, Neuhuber W, Tamm ER.
    Journal: Brain Res; 1995 May 29; 681(1-2):229-34. PubMed ID: 7552287.
    Abstract:
    In human ciliary ganglia, 18% of neurons were in contact with substance P (SP) and 12% with calcitonin gene-related peptide (CGRP) like-immunoreactive (LI) varicose axons. CGRP was colocalized with SP. Numerous SP-LI and CGRP-LI non-varicose nerve fibers were found between the ganglion cells and in nerve trunks that entered the ganglia. Axons immunoreactive for neuropeptide Y (NPY), vasoactive intestinal polypeptide (VIP), tyrosine hydroxylase (TH) or dopamine-beta-hydroxylase (DBH) never contacted neuronal cell bodies. Perikarya of ciliary neurons neither stained for any of the neuropeptides nor for DBH. 23% of ciliary perikarya were TH-immunoreactive. These observations suggest an innervation of human ciliary ganglion neurons by peptidergic primary afferent collaterals presumably of trigeminal origin.
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