Fig. 4.

Distribution of trans-synaptically labeled preganglionic motoneurons. Inserts in the upper right show the pattern of WGA–HRP-labeled (filled) and -unlabeled (empty) postganglionic motoneurons in the ciliary ganglia. Fewer cells were labeled from the left aqueous injection than the right vitreous injection. A rostral (a) to caudal (i) series of sections illustrates the AM and EWpg, with low (left) and high (right) magnification views. Arrows indicate the left and right AM and EWpg nuclei in the high-magnification view, where trans-synaptically labeled (filled profiles) preganglionic motoneurons outnumber unlabeled motoneurons (empty profiles). Roughly equal numbers of labeled cells were present on the two sides