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A light- and electron-microscopic investigation of the optic tectum of the frog, Rana pipiens, I: The retinal axons

Published online by Cambridge University Press:  02 June 2009

Thomas E. Hughes
Thomas E. Hughes
Affiliation:
Duke University Medical Center, Department of Anatomy, Durham
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Abstract

There are several different groups of ganglion cells in the retina of the frog. Although their axons are thought to terminate in different layers of the optic tectum, little is known about the morphology of their terminal arbors or their synaptic targets. The present paper reports the results of a layer-by-layer study of horseradish peroxidase labeled retinal axons in the optic tectum of Rana pipiens. Light and electron microscopy was used to study the axon's laminar distribution, patterns of arborization, and synaptic contacts.

Labeled retinal axons were found in all of the superficial layers of the tectum (A-G). From layer to layer, the retinal axons differed markedly in the diameter of their parent axons (0.2−3.0 μm) and in the morphology and horizontal extent of their terminal arbors.

Five classes of synaptic terminals could be distinguished in the tectum. The retinal terminals belonged to class characterized by round, medium-sized synaptic vesicles. They made synaptic contact with dendrites and other axon terminals in each of the layers. They were always the presynaptic component. The postsynaptic dendrites were often the vertically oriented processes of cells located in the deeper layers. The postsynaptic terminals belonged to a class distinguished by their flat, medium-sized vesicles. These terminals in turn contacted what appeared to be dendrites. In layer eight, the retinal axons were often large, spoon-shaped boutons that ended in apposition with the somata of the layer.

Keywords

Horseradish peroxidaseMorphologyLaminaeSynapses
Type
Research Articles
Information
Visual Neuroscience , Volume 4 , Issue 6 , June 1990 , pp. 499 - 518
Copyright
Copyright © Cambridge University Press 1990

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