Laminar origin of ipsilateral tectopontine pathways
The purpose of these experiments was to identify the cells of origin of the ipsilateral tectopontine pathways in the grey squirrel (Sciurus carolinensis). Following injections of tritiated amino acids into individual collicular laminae, labelled fibers could be traced to the dorsolateral pontine nuclei and overlying lateral pontine tegmentum. Fibers originating in stratum griseum superficiale terminated most heavily within the pontine nuclei whereas those arising from stratum griseum profundum terminated most heavily within the tegmentum. After horseradish peroxidase was injected into the dorsolateral pontine nuclei, cells labelled with reaction product were found in all 3 grey laminae of the superior colliculus, but the majority were located in stratum griseum superficiale. In contrast, when horseradish peroxidase was injected into the tectorecipient pontine tegmentum, most of the labelled cells were located in stratum griseum profundum. These results indicate that each of the 3 grey laminae of the superior colliculus projects to both the dorsolateral pontine nuclei and the lateral pontine tegmentum. However, the pathway to the pontine nuclei arises chiefly in stratum griseum superficiale while the tectotegmental pathway arises chiefly in stratum griseum profundum. © 1981.
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