The optic tectum of the dogfish Scyliorhinus canicula L.: a Golgi study.
The optic tectum of the dogfish Scyliorhinus canicula L. was studied by using the methods of Nissl, reduced silver nitrate, Golgi-aldehyde, and Golgi-Cox. Six layers and eight types of neurons were recognized. These cell types are not restricted to one layer; in fact some are found in all six tectal layers. The types of cells found are A) monopolar, B) triangular, C) radial bipolar, D) horizontal fusiform, E) large tectal, F) small tectal, G) pyriform, and H) stellate cells. In at least six of the cell types a series of dendritic specializations can be observed, such as spines in the form of "drumsticks" and thin varicose appendages, similar to those reported previously in the optic tecta of amphibians and teleosts. The optic tectum of the dogfish shows a degree of complexity comparable to that of amphibians and teleosts.
Manso
M J
MJ
Colegio Universitario, Universidad de la Coruña, Spain.
Anadon
R
R
D000818:Animals; D003712:Dendrites / Q000648:ultrastructure; D004284:Dogfish / Q000033:anatomy & histology*; D009474:Neurons / Q000648:ultrastructure; D012834:Silver; D012835:Silver Nitrate; D013194:Staining and Labeling; D013477:Superior Colliculi / Q000033:anatomy & histology / Q000648:ultrastructure*
C000212:ammoniacal silver; D012834:Silver; D012835:Silver Nitrate