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The axons of retinal ganglion cells grow to the optic tectum in discrete steps. Two neurons that carry information from the nasal half of the retina are shown. The axon of one crosses the optic chiasm to reach the contralateral optic tectum. The axon of the other also crosses the optic chiasm but projects to the lateral geniculate nucleus. The numbers indicate important landmarks on the axon's journey. The growing axon is directed toward the optic nerve head with the retina (1), enters into the optic nerve (2), extends through the optic nerve (3), swerves to remain ipsilateral (not shown) or cross to the contralateral side at the optic chiasm (4), extends through the optic tract (5), enters into the optic tectum or lateral geniculate nucleus (6), navigates to an appropriate rostrocaudal and dorsoventral position on the tectum (7), descends from the tectal surface (8), stops at an appropriate layer where a Source: The Growth and Guidance of Axons, Principles of Neural Science, Fifth Editon rudimentary terminal arbor is formed (9), and finally is refined (10). Citation: Kandel ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, Fifth Editon; 2012 Available at: http://mhmedical.com/ Accessed: May 11, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved