Chapter 3: Organisation of efferent projections from superior colliculus to brainstem in rat: evidence for functional output channels
Review articleOpen access
Paul Dean - No affiliation found
1988/01/01 Full-length article DOI: 10.1016/S0079-6123(08)60463-X
Publisher SummaryThis chapter focuses on the organization of efferent projections from superior colliculus to brainstem in rat. Because the superior colliculus receives direct visual input and projects directly to premotor areas of the brainstem and spinal cord, it has been used as a preparation to study certain kinds of visuomotor transformation—that is, to understand how visual input signals can be processed to produce appropriate motor output. Recent evidence has suggested that a major feature of afferent input to the intermediate and deeper layers of the superior colliculus is its inhomogeneity with terminal zones appearing in particular layers or in patches within a layer. At least in one instance, a close spatial relationship has been demonstrated between an afferent and an output channel. The existence of functionally distinct output channels has implications for the investigation of sensorimotor transformations within the superior colliculus.
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