Ornithodiplostomum ptychocheilus: migration to the brain of the fish intermediate host, Pimephales promelas. |
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Authors: | G L Hendrickson |
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Institution: | Department of Zoology, Sciences II, Iowa State University, Ames, Iowa 50011, U.S.A. |
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Abstract: | Migration of cercariae of the diplostomatid trematode, Ornithodiplostomum ptychocheilus, to the brain of the fathead minnow, Pimephales promelas, takes place via directed, nonrandom movement. Penetration of the fish epidermis is rapid and is essentially complete by 2 hr postinfection. Migration to the central nervous system occurs almost exclusively via the general body musculature and connective tissue, although a few cercariae gain direct access to the nervous system via the eyes. Cercariae enter either the neural canal and spinal cord, or the brain via the spinal or cranial nerves and their associated foramina, although cercariae appear to remain in (on) these peripheral nerves for only a short time. Cercariae associated with cranial nerves continue to the brain. Those becoming associated with spinal nerves travel up the neural canal and (or) spinal cord to the brain. Data suggest that most arrive at the brain via the neural canal and spinal cord. Within the brain, most developing metacercariae (neascus-type) occur in the optic lobes and cerebellum. Whether this is “selective localization” or merely the result of the larger space afforded by these brain regions could not be determined. |
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Keywords: | Trematoda Diplostomatidae Cercariae Cercarial behavior Cercarial localization Cercarial migration Cercarial site finding Metacercariae Pisces Fish Fish nervous system Host-parasite relationships CN cranial nerve NC neural canal OL optic lobe R retina SC spinal cord SN spinal nerve V vagus nerve C cerebellum H hypothalamus M medulla oblongata O olfactory lobe OL optic lobe S brainstem |
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