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. Author manuscript; available in PMC: 2009 Jul 28.
Published in final edited form as: J Comp Neurol. 2005 Oct 31;491(4):305–319. doi: 10.1002/cne.20694

Figure 4. The mediolateral order of axons in the brachium of the superior colliculus reflects their dorsoventral origin in the retina.

Figure 4

A. Axons originating from dorsal retina (SR) are strongly biased to enter the SC (outlined) from the lateral side. The diagonal line (red) indicates the path across the brachium in which axonal labeling was measured. B. Axons originating from temporal retina (LR) are not biased to either the lateral or medial colliculus on entry. C. Axons from ventral retina (IR) are strongly biased to enter the colliculus on the medial edge. D. Axons originating from the nasal retina (MR) show no medial-lateral bias upon entry into the colliculus. E. Normalized distribution of fluorescent label in the brachium for the four animals represented in A–D. F. Average position of the center of mass of the distribution of fluorescent label in the brachium as a function of retinal location of the injection. Position of the center of mass of the fluorescent label is shown as a function of total medial-lateral width of the brachium, such that 0% means the average center of mass is on the medial edge, and 100% means the average center of mass of the distribution of fluorescent label is on the lateral edge. The location of the retinal injection (abscissa) is defined in muscle coordinates. The four principal ocular muscles (SR, MR, IR and LR) are indicated, along with the intervening inter-muscle regions (MS, MI, LI, LS). The number of animals (injections) appears next to the corresponding point in the plot. 1 mm scale bar in A applies to all panels. Medial is to the right and caudal is up.