Synaptic dimorphism in Onychophoran cephalic ganglia

Peña Contreras, Z.; Mendoza Briceño, R.V.; Miranda Contreras, L.; Palacios Prü, E.L

dc.creator	Peña Contreras, Z.
dc.creator	Mendoza Briceño, R.V.
dc.creator	Miranda Contreras, L.
dc.creator	Palacios Prü, E.L
dc.date	2003-11-21
dc.date.accessioned	2016-05-03T15:31:44Z
dc.date.available	2016-05-03T15:31:44Z
dc.identifier	http://revistas.ucr.ac.cr/index.php/rbt/article/view/6078
dc.identifier	10.15517/rbt.v55i1.6078
dc.identifier.uri	https://hdl.handle.net/10669/27139
dc.description	The taxonomic location of the Onychophora has been controversial because of their phenotypic and genotypic characteristics, related to both annelids and arthropods. We analyzed the ultrastructure of the neurons and their synapses in the cephalic ganglion of a poorly known invertebrate, the velvet worm Peripatus sedgwicki, from the mountainous region of El Valle, Mérida, Venezuela. Cephalic ganglia were dissected, fixed and processed for transmission electron microscopy. The animal has a high degree of neurobiological development, as evidenced by the presence of asymmetric (excitatory) and symmetric (inhibitory) synapses, as well as the existence of glial cell processes in a wide neuropile zone. The postsynaptic terminals were seen to contain subsynaptic cisterns formed by membranes of smooth endoplasmic reticulum beneath the postsynaptic density, whereas the presynaptic terminal showed numerous electron transparent synaptic vesicles. From the neurophylogenetic perspectives, the ultrastructural characteristics of the central nervous tissue of the Onychophora show important evolutionary acquirements, such as the presence of both excitatory and inhibitory synapses, indicating functional synaptic transmission, and the appearance of mature glial cells.	en-US
dc.format	application/pdf
dc.language	eng
dc.publisher	Universidad de Costa Rica	en-US
dc.rights	Copyright (c) 2014 International Journal of Tropical Biology and Conservation	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 55 (1), March 2007	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 55 (1), March 2007	es-ES
dc.source	Revista Biología Tropical; Vol. 55 (1), March 2007	pt-PT
dc.source	2215-2075
dc.source	0034-7744
dc.source	10.15517/rbt.v55i1
dc.title	Synaptic dimorphism in Onychophoran cephalic ganglia	en-US
dc.title	Synaptic dimorphism in Onychophoran cephalic ganglia	es-ES
dc.type	artículo original
dc.coverage	CRC	en-US

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