Striped pattern of labeling in ground squirrel superior colliculus following intraocular HRP injections

Abstract

In the 13-lined ground squirrel ( Citellus tridecemlineatus), intravitreal injections of horseradish peroxidase (HRP) or wheat germ-agglutinated HRP (WGA-HRP) tracers produced a striped pattern of labeling in the contralateral superficial gray (SGS) of the superior colliculus in most, but not all, cases. The stripes extended dorsoventrally throughout the SGS in a rostral-medial to caudal-lateral orientation. In general, the striped labeling was more distinct and was observed more frequently with the HRP, rather than the WGA-HRP, tracer.