. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Dominating Factor 739 In these three pairs of regions the fibers of the optic tract synapse with neurons which relay the impulses to several different parts of the brain. From the lateral geniculate bodies the relaying fibers run chiefly to areas of visual sensation in the occipital cerebral cortex (Fig. 640). The anterior colliculi, which receive fibers from the occipital cortex as well as the optic tracts, relay messages to the nuclei of the several
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Dominating Factor 739 In these three pairs of regions the fibers of the optic tract synapse with neurons which relay the impulses to several different parts of the brain. From the lateral geniculate bodies the relaying fibers run chiefly to areas of visual sensation in the occipital cerebral cortex (Fig. 640). The anterior colliculi, which receive fibers from the occipital cortex as well as the optic tracts, relay messages to the nuclei of the several cranial nerves which con- trol the movements of the eyeballs and also of the head. Fibers from the area just in front of each anterior colliculus carry impulses which eventually reach the intrinsic muscles of the eyeball. Optic Nerve Optic Tract- Direct Fiber—. - Retina -Optic Chiasma Optic Thalamus -Lateral Geniculate Body —Anterior Colliculus Cerebral Cortex — Fig. 656. Optic chiasma and tracts of man. The intricate optic pathways of mammals have evolved from a relatively simple plan in lower vertebrates. In fishes most of the optic-tract fibers run into the optic lobes (Fig. 657). In reptiles optic lobes continue to be highly important relaying centers in the optic pathways, but some optic fibers terminate in the diencephalon where they synapse with neurons leading to the cerebral cortex, which is definitely present in these animals. In mammals relatively few primary optic fibers go to the metencephalon. most of them terminating in the lateral geniculate bodies of the 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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