Figure 10.

Images of labeled tectoincertal, incertotectal and pretectoincertal elements in the macaque monkey. A. Appearance of ZI following an injection of WGA-HRP into the SC. Note the band of labeled cells filling vZI and the terminal puncta in dZI. Scattered, more lightly labeled cells in dZI are indicated by blue arrows. B. Labeled axonal arbors following a BDA injection of the pretectum. Boxes indicate regions of dZI and vZI shown in the high magnification inserts. Terminations are much denser in dZI. C. Numerous labeled axonal arbors are present in both dZI and vZI following an injection of BDA into the SC. Box indicates area shown at higher magnification in D, where numerous labeled boutons are shown in close association (arrowheads) with a retrogradely labeled incertotectal neuron (red arrow). Terminal puncta are present in both dZI and vZI (E) and in the dorsolateral extension of ZI (dlZI) (F) following a WGA-HRP injection of the pretectum (shown in Fig. 12). Most of the labeled cells (blue arrows) are found in dZI (E) and dlZI (F). G. Labeled neurons (blue arrows) are present in the intermediate gray layer (SGI) following an injection of WGA-HRP into ZI (shown in Fig. 13), along with scattered terminal puncta. Images A and E–G were taken with crossed polarizers. Scale in E = A & F, in G = C.