Abstract
The serotonergic components in the nervous system of planarian Girardia tigrina was shown by immunocytochemical method. The whole-mounts are used to extract the maximum information and conduct a quantitative morphometric analysis of serotonin-immunopositive elements in different body regions. The planarian nervous system is represented by cephalic ganglion in the anterior body part and a pair of well-defined ventral nerve cords running along the body. The density of serotonin components is greatest in the head region, which reflects in thickness of cephalic ganglion arch (123–94 µm) and of nerve cords, gradually decreasing from head (111–97 µm) to middle (83–42 µm) and tail (64-28 µm) zones. Nerve nodes contain 4–10 serotonergic neurons in different body regions and connected by a few transverse commissures with a distance from 70 to 145 µm. Results supplement the available data and can be useful for comparative analysis of serotonergic components in free-living and parasitic flatworms.
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