Abstract
Calretinin and calbindin D28K were localized in the superficial layers of rabbit superior colliculus (SC). Calretinin and calbindin D28K-immunoreactive (-IR) neurons were concentrated in the upper superficial gray layer. Calretinin-IR fibers were found in the optic layer. The majority of calretinin-IR cells were small- to medium-sized vertical fusiform neurons and neurons with round or stellate-shaped somas with small varicose dendrites. The morphology of calbindin D28 K-IR neurons was different from that of calretinin neurons. Anti-calbindin D28K-IR neurons usually had fusiform cell bodies and a thick primary dendrite with small branches forming a dendritic bouquet. Two-color immunofluorescence revealed that no cells expressed both proteins. Following unilateral enucleation a marked reduction of calretinin-IR fibers in the contralateral side to the enucleation was found. Enucleation appeared to have no effect on the cell bodies labeled with either protein. The results suggest the anti-calretinin immunoreactivity in the superficial layer of rabbit SC contrasts starkly with that of other animals.
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