The superior colliculus projection upon the macaque inferior olive. 2024

Paul J May, and Susan Warren, and Yoshiko Kojima
Neurobiology & Anatomical Sciences, 1475 Saint Ann Street, Jackson, MS, 39202, USA. pauljmay55@gmal.com.

Saccade accommodation is a productive model for exploring the role of the cerebellum in behavioral plasticity. In this model, the target is moved during the saccade, gradually inducing a change in the saccade vector as the animal adapts. The climbing fiber pathway from the inferior olive provides a visual error signal generated by the superior colliculus that is believed to be crucial for cerebellar adaptation. However, the primate tecto-olivary pathway has only been explored using large injections of the central portion of the superior colliculus. To provide a more detailed picture, we have made injections of anterograde tracers into various regions of the macaque superior colliculus. As shown previously, large central injections primarily label a dense terminal field within the C subdivision at caudal end of the contralateral medial inferior olive. Several, previously unobserved, sites of sparse terminal labeling were noted: bilaterally in the dorsal cap of Kooy and ipsilaterally in the C subdivision of the medial inferior olive. Small, physiologically directed, injections into the rostral, small saccade portion of the superior colliculus produced terminal fields in the same regions of the medial inferior olive, but with decreased density. Small injections of the caudal superior colliculus, where large amplitude gaze changes are encoded, again labeled a terminal field located in the same areas. The lack of a topographic pattern within the main tecto-olivary projection suggests that either the precise vector of the visual error is not transmitted to the vermis, or that encoding of this error is via non-topographic means.

UI MeSH Term Description Entries

Related Publications

Paul J May, and Susan Warren, and Yoshiko Kojima
August 1995, Hearing research,
Paul J May, and Susan Warren, and Yoshiko Kojima
February 1970, Vision research,
Paul J May, and Susan Warren, and Yoshiko Kojima
October 2023, The Journal of comparative neurology,
Paul J May, and Susan Warren, and Yoshiko Kojima
July 2004, Journal of neurophysiology,
Paul J May, and Susan Warren, and Yoshiko Kojima
January 2006, Journal of neurophysiology,
Paul J May, and Susan Warren, and Yoshiko Kojima
January 1986, Anatomy and embryology,
Paul J May, and Susan Warren, and Yoshiko Kojima
June 1995, The Journal of comparative neurology,
Copied contents to your clipboard!