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Fine structure of the nervous system of Cercaria parvicaudata Stunkard & Shaw, 1931 (Digenea, Renicolidae). / Denisova, Sofia A.; Shchenkov, Sergei V. .

In: Journal of Morphology, Vol. 281, No. 7, 21137, 01.07.2020, p. 765-777.

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@article{bc95ccebc0ad4667ac270a55f2c3e88b,
title = "Fine structure of the nervous system of Cercaria parvicaudata Stunkard & Shaw, 1931 (Digenea, Renicolidae)",
abstract = "The biology of free‐living and parasitic Platyhelminthes is diverse. Taking into account the widespread prevalence of parasitic flatworms, Digenea is the least studied group regarding the fine structure of nervous system especially of the cercarial life stage. Here, we present a description of the fine structure of central nervous system (CNS) and two types of uniciliate sensory papillae of xiphidiocercaria Cercaria parvicaudata (Microphalloidea, Renicolidae). The present study documents that C. parvicaudata has a complex nervous system that includes a well‐developed ganglion with a cortex of perikarya and glia‐like sheaths, myelin‐like structures within one of the dorsal nerve cords and four types of polarized synapses between neurites. Different types of neurons in the CNS could not be distinguished on ultrastructural level due to high similarity in their fine structure. Shared polarized synapses with high electron density of presynaptic components are numerous in the neuropile and nerve cords of this larva. Within the larval body, we detected specialized “support” processes that relate to different tissues. Some “support” processes are also closely related to the nervous system of C. parvicaudata , where they are considered as glia‐like structures. In this case, the fine structure of glia‐like “support” cells of C. parvicaudata differs from those described as glia‐like cells in adult flatworms. We suggest a wide prevalence of glia‐like cells among cercariae, as well as the fact that glia‐like structures in digenean nervous systems can develop from various nonneuronal tissues.",
keywords = "central nervous system, glia‐like cells, Microphalloidea, sensory papillae, synapses, microphalloidea, glia-like cells, CEREBRAL GANGLION, CELLS, FASCIOLA-HEPATICA, FLATWORMS, SENSORY RECEPTORS, ORGANIZATION, LIVER FLUKE, ULTRASTRUCTURE, BRAIN, PLATYHELMINTHES",
author = "Denisova, {Sofia A.} and Shchenkov, {Sergei V.}",
note = "Publisher Copyright: {\textcopyright} 2020 Wiley Periodicals, Inc.",
year = "2020",
month = jul,
day = "1",
doi = "10.1002/jmor.21137",
language = "English",
volume = "281",
pages = "765--777",
journal = "Journal of Morphology",
issn = "0362-2525",
publisher = "Wiley-Blackwell",
number = "7",

}

RIS

TY - JOUR

T1 - Fine structure of the nervous system of Cercaria parvicaudata Stunkard & Shaw, 1931 (Digenea, Renicolidae)

AU - Denisova, Sofia A.

AU - Shchenkov, Sergei V.

N1 - Publisher Copyright: © 2020 Wiley Periodicals, Inc.

PY - 2020/7/1

Y1 - 2020/7/1

N2 - The biology of free‐living and parasitic Platyhelminthes is diverse. Taking into account the widespread prevalence of parasitic flatworms, Digenea is the least studied group regarding the fine structure of nervous system especially of the cercarial life stage. Here, we present a description of the fine structure of central nervous system (CNS) and two types of uniciliate sensory papillae of xiphidiocercaria Cercaria parvicaudata (Microphalloidea, Renicolidae). The present study documents that C. parvicaudata has a complex nervous system that includes a well‐developed ganglion with a cortex of perikarya and glia‐like sheaths, myelin‐like structures within one of the dorsal nerve cords and four types of polarized synapses between neurites. Different types of neurons in the CNS could not be distinguished on ultrastructural level due to high similarity in their fine structure. Shared polarized synapses with high electron density of presynaptic components are numerous in the neuropile and nerve cords of this larva. Within the larval body, we detected specialized “support” processes that relate to different tissues. Some “support” processes are also closely related to the nervous system of C. parvicaudata , where they are considered as glia‐like structures. In this case, the fine structure of glia‐like “support” cells of C. parvicaudata differs from those described as glia‐like cells in adult flatworms. We suggest a wide prevalence of glia‐like cells among cercariae, as well as the fact that glia‐like structures in digenean nervous systems can develop from various nonneuronal tissues.

AB - The biology of free‐living and parasitic Platyhelminthes is diverse. Taking into account the widespread prevalence of parasitic flatworms, Digenea is the least studied group regarding the fine structure of nervous system especially of the cercarial life stage. Here, we present a description of the fine structure of central nervous system (CNS) and two types of uniciliate sensory papillae of xiphidiocercaria Cercaria parvicaudata (Microphalloidea, Renicolidae). The present study documents that C. parvicaudata has a complex nervous system that includes a well‐developed ganglion with a cortex of perikarya and glia‐like sheaths, myelin‐like structures within one of the dorsal nerve cords and four types of polarized synapses between neurites. Different types of neurons in the CNS could not be distinguished on ultrastructural level due to high similarity in their fine structure. Shared polarized synapses with high electron density of presynaptic components are numerous in the neuropile and nerve cords of this larva. Within the larval body, we detected specialized “support” processes that relate to different tissues. Some “support” processes are also closely related to the nervous system of C. parvicaudata , where they are considered as glia‐like structures. In this case, the fine structure of glia‐like “support” cells of C. parvicaudata differs from those described as glia‐like cells in adult flatworms. We suggest a wide prevalence of glia‐like cells among cercariae, as well as the fact that glia‐like structures in digenean nervous systems can develop from various nonneuronal tissues.

KW - central nervous system

KW - glia‐like cells

KW - Microphalloidea

KW - sensory papillae

KW - synapses

KW - microphalloidea

KW - glia-like cells

KW - CEREBRAL GANGLION

KW - CELLS

KW - FASCIOLA-HEPATICA

KW - FLATWORMS

KW - SENSORY RECEPTORS

KW - ORGANIZATION

KW - LIVER FLUKE

KW - ULTRASTRUCTURE

KW - BRAIN

KW - PLATYHELMINTHES

UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/jmor.21137

UR - http://www.scopus.com/inward/record.url?scp=85085137023&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/742a4c92-a90f-3ebd-b371-497290147670/

U2 - 10.1002/jmor.21137

DO - 10.1002/jmor.21137

M3 - Article

VL - 281

SP - 765

EP - 777

JO - Journal of Morphology

JF - Journal of Morphology

SN - 0362-2525

IS - 7

M1 - 21137

ER -

ID: 53641046