. Human embryology and morphology. Embryology, Human; Morphology. 220 HUMAN EMBRYOLOGY AND MORPHOLOGY. optic nerves arise as processes of the neural tube, and are not comparable to the remaining cranial nerves. Primarily each segmental cranial nerve appears to have contained sensory and motor fibres. The sensory fibres, like those of the spinal nerves, optic chias. Seg. I. Seg. II, Seg. III. « Seg. IV. ' " ' Seg. V. 3rd vent III (nerve) IV: V. (sensory) 4th vent. V. (motor). genie, gang. IX. Seg. VII. Seg. VIII. Seg. IX. Fig. 180.—A Diagram to show the Relationship of the Cranial Nerves t
. Human embryology and morphology. Embryology, Human; Morphology. 220 HUMAN EMBRYOLOGY AND MORPHOLOGY. optic nerves arise as processes of the neural tube, and are not comparable to the remaining cranial nerves. Primarily each segmental cranial nerve appears to have contained sensory and motor fibres. The sensory fibres, like those of the spinal nerves, optic chias. Seg. I. Seg. II, Seg. III. « Seg. IV. ' " ' Seg. V. 3rd vent III (nerve) IV: V. (sensory) 4th vent. V. (motor). genie, gang. IX. Seg. VII. Seg. VIII. Seg. IX. Fig. 180.—A Diagram to show the Relationship of the Cranial Nerves to the Primitive Segments of the Head. are developed from ganglionic cells derived from the neural crest, and are of two kinds, somatic and visceral. The motor fibres are developed from cells in the neural tube and are also of two kinds, somatic and visceral. In the evolution of the vertebrates there has been much reconstruction in the arrangement of the segmental fibres, the sensory fibres of several segments having become grouped together in the 5th nerve, and the motor fibres of others in such nerves as the 10th and 12th. The Segments to which the Cranial Nerves belong. 1st Cranial Segment.—The motor nerve is the 3rd or 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 Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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