. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Diagram to represent the supposed identical part* of the two retinae. {After Midler.) 1, 2, 3, &c., the identical parts of the two retinae ; c, c, the optic axes. retinae occupy the same degrees of latitude and longitude: 1 is identical with 1, 2 with 2, and so on ; but 1 in the one eye is not identical with 5 in the other eye. " To explain the single vision, therefore, it is necessary that not merely each root of the optic nerve, but each primitive fibre of each root should in the chiasma divide into two branch
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Diagram to represent the supposed identical part* of the two retinae. {After Midler.) 1, 2, 3, &c., the identical parts of the two retinae ; c, c, the optic axes. retinae occupy the same degrees of latitude and longitude: 1 is identical with 1, 2 with 2, and so on ; but 1 in the one eye is not identical with 5 in the other eye. " To explain the single vision, therefore, it is necessary that not merely each root of the optic nerve, but each primitive fibre of each root should in the chiasma divide into two branches for the two optic nerves, so that the identical fibres of the two nerves might com- municate with the brain at one point only, viz. by one radical fibre, as in tiie annexed wood- cut (fg. 422). But such a division of the fibres in the chiasma does not exist: Treviranus and Volkmann were unable to detect any division of fibres in the chiasma, and I also was unsuc- cessful in my search for such dividing fibres. (Fig. 422. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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