Synaptic dimorphism in Onychophoran cephalic ganglia
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| Formato: | Online |
| Idioma: | eng |
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Universidad de Costa Rica
2007
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| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/rbt/article/view/6078 |
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RBT6078 |
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RBT60782022-05-30T19:06:49Z Synaptic dimorphism in Onychophoran cephalic ganglia Synaptic dimorphism in Onychophoran cephalic ganglia Peña Contreras, Z. Mendoza Briceño, R.V. Miranda Contreras, L. Palacios Prü, E.L Onicóforo sinapsis Peripatus ultraestructura ganglio cefálico evolución Onychophora synapses ultrastructure cephalic ganglia evolution 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. Universidad de Costa Rica 2007-03-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article Text application/pdf https://revistas.ucr.ac.cr/index.php/rbt/article/view/6078 10.15517/rbt.v55i1.6078 Revista de Biología Tropical; Vol. 55 No. 1 (2007): Volume 55 – Regular number 1 – March 2007; 261–267 Revista de Biología Tropical; Vol. 55 Núm. 1 (2007): Volumen 55 – Número regular 1 – Marzo 2007; 261–267 Revista Biología Tropical; Vol. 55 N.º 1 (2007): Volume 55 – Regular number 1 – March 2007; 261–267 2215-2075 0034-7744 10.15517/rbt.v55i1 eng https://revistas.ucr.ac.cr/index.php/rbt/article/view/6078/5783 Copyright (c) 2007 Revista de Biología Tropical http://creativecommons.org/licenses/by/4.0 |
| institution |
Universidad de Costa Rica |
| collection |
Revista de Biología Tropical |
| language |
eng |
| format |
Online |
| author |
Peña Contreras, Z. Mendoza Briceño, R.V. Miranda Contreras, L. Palacios Prü, E.L |
| spellingShingle |
Peña Contreras, Z. Mendoza Briceño, R.V. Miranda Contreras, L. Palacios Prü, E.L Synaptic dimorphism in Onychophoran cephalic ganglia |
| author_facet |
Peña Contreras, Z. Mendoza Briceño, R.V. Miranda Contreras, L. Palacios Prü, E.L |
| author_sort |
Peña Contreras, Z. |
| title |
Synaptic dimorphism in Onychophoran cephalic ganglia |
| title_short |
Synaptic dimorphism in Onychophoran cephalic ganglia |
| title_full |
Synaptic dimorphism in Onychophoran cephalic ganglia |
| title_fullStr |
Synaptic dimorphism in Onychophoran cephalic ganglia |
| title_full_unstemmed |
Synaptic dimorphism in Onychophoran cephalic ganglia |
| title_sort |
synaptic dimorphism in onychophoran cephalic ganglia |
| title_alt |
Synaptic dimorphism in Onychophoran cephalic ganglia |
| publisher |
Universidad de Costa Rica |
| publishDate |
2007 |
| url |
https://revistas.ucr.ac.cr/index.php/rbt/article/view/6078 |
| work_keys_str_mv |
AT penacontrerasz synapticdimorphisminonychophorancephalicganglia AT mendozabricenorv synapticdimorphisminonychophorancephalicganglia AT mirandacontrerasl synapticdimorphisminonychophorancephalicganglia AT palaciospruel synapticdimorphisminonychophorancephalicganglia |
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1810114590086791168 |