Adrenergic innervation of the parasympathetic ciliary ganglion in the chick.
The chick ciliary ganglion receives a nonvascular symathetic innervation in addition to the well-known cholinergic one; fluorescent, varicose adrenergic fibers form pericelluar baskets. Adrenergic fibes were identified electron microscopically in ganglia fixed with potassium permanganate. The fibers degenerate after injection of 6-hydroxydopamine. No true synaptic relationships involving adrenergic varicosities and ganglion cells or cholinergic terminals were demonstrable. The distribution of the adrenergic fibers suggests a kind of "distance à synapse" with the choroidal cells or with the preganglionic fibers (or both). The adrenergic innervation might provide a modulation of the cholinergic transmission.
D000818:Animals; D002645:Chickens; D002924:Ciliary Body / Q000294:innervation*; D005260:Female; D005724:Ganglia / Q000166:cytology*; D008854:Microscopy, Electron; D008856:Microscopy, Fluorescence; D009457:Neuroglia / Q000166:cytology; D009474:Neurons / Q000166:cytology; D010275:Parasympathetic Nervous System / Q000166:cytology*; D013564:Sympathetic Nervous System / Q000166:cytology*; D013569:Synapses / Q000166:cytology; D013572:Synaptic Vesicles