Specialized presynaptic dendrites in the stratum cellulare externum of the optic tectum of an elasmobranch, Scyliorhinus canicula L.
Electron microscopy of the stratum cellulare externum of the optic tectum of an elasmobranch revealed the presence of two types of presynaptic dendrites in the neuropil as well as axo-dendritic synapses. In the dendro-dendritic or dendro-axonic synapses, the presynaptic process was a beaded dendrite. These findings support the view that the synaptic organization of the tectum in elasmobranchs is basically similar to that of higher vertebrates, rather than the classical opinion that it is less highly organized.
Manso
M J
MJ
University of La Coruña, Department of Cellular and Molecular Biology, Spain.
Anadón
R
R
D000818:Animals; D003712:Dendrites / Q000648:ultrastructure*; D004284:Dogfish / Q000502:physiology*; D008854:Microscopy, Electron; D008870:Microtubules / Q000648:ultrastructure; D013477:Superior Colliculi / Q000648:ultrastructure*; D013569:Synapses / Q000648:ultrastructure