Synaptic dimorphism in Onychophoran cephalic ganglia
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| Format: | Artículo científico |
| Langue: | en |
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Universidad de Costa Rica
2007
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| author | Z. Peña-Contreras |
| author_facet | Z. Peña-Contreras |
| contents | Synaptic dimorphism in Onychophoran cephalic ganglia Z. Peña-Contreras R.V. Mendoza-Briceño E.L Palacios-Prü L. Miranda-Contreras Biología synapses Peripatus evolution Onychophora ultrastructure The taxonomic location of the Onychophora has been controversial because of their phenotypicand genotypic characteristics, related to both annelids and arthropods. We analyzed the ultrastructure of theneurons and their synapses in the cephalic ganglion of a poorly known invertebrate, the velvet worm Peripatussedgwicki, from the mountainous region of El Valle, Mérida, Venezuela. Cephalic ganglia were dissected, fixedand 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 asthe existence of glial cell processes in a wide neuropile zone. The postsynaptic terminals were seen to containsubsynaptic cisterns formed by membranes of smooth endoplasmic reticulum beneath the postsynaptic density,whereas the presynaptic terminal showed numerous electron transparent synaptic vesicles. From the neurophylogeneticperspectives, the ultrastructural characteristics of the central nervous tissue of the Onychophora showimportant evolutionary acquirements, such as the presence of both excitatory and inhibitory synapses, indicatingfunctional synaptic transmission, and the appearance of mature glial cells. Rev. Biol . Trop. 55 (1): 261-267.Epub 2007 March. 31. 2007 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44955128 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.55 |
| format | Artículo científico |
| id | redalyc_44955128 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Synaptic dimorphism in Onychophoran cephalic ganglia Z. Peña-Contreras Biología synapses Peripatus evolution Onychophora ultrastructure Synaptic dimorphism in Onychophoran cephalic ganglia Z. Peña-Contreras R.V. Mendoza-Briceño E.L Palacios-Prü L. Miranda-Contreras Biología synapses Peripatus evolution Onychophora ultrastructure The taxonomic location of the Onychophora has been controversial because of their phenotypicand genotypic characteristics, related to both annelids and arthropods. We analyzed the ultrastructure of theneurons and their synapses in the cephalic ganglion of a poorly known invertebrate, the velvet worm Peripatussedgwicki, from the mountainous region of El Valle, Mérida, Venezuela. Cephalic ganglia were dissected, fixedand 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 asthe existence of glial cell processes in a wide neuropile zone. The postsynaptic terminals were seen to containsubsynaptic cisterns formed by membranes of smooth endoplasmic reticulum beneath the postsynaptic density,whereas the presynaptic terminal showed numerous electron transparent synaptic vesicles. From the neurophylogeneticperspectives, the ultrastructural characteristics of the central nervous tissue of the Onychophora showimportant evolutionary acquirements, such as the presence of both excitatory and inhibitory synapses, indicatingfunctional synaptic transmission, and the appearance of mature glial cells. Rev. Biol . Trop. 55 (1): 261-267.Epub 2007 March. 31. 2007 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44955128 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.55 |
| title | Synaptic dimorphism in Onychophoran cephalic ganglia |
| topic | Biología synapses Peripatus evolution Onychophora ultrastructure |
| url | https://www.redalyc.org/articulo.oa?id=44955128 |