. Human embryology and morphology. Embryology, Human; Morphology. 216 HUMAN EMBRYOLOGY AND MORPHOLOGY. Island of Eeil and its opercula are only well developed in the higher primates. Figs. 178, 179 and 180 represent the stages in its evolution. In Fig. 178 the condition in dog-like apes is sup. front intra-parietal „„„„„„ j?0 par-oca fis. affenspalte. island of Reil ant lim. sulcus (fronto-orbital) 1st temp. fis. occip. fis. Fig. 178.—The Island of Reil and Fissures on the lateral Aspect of the Brain of a dog-like Ape. represented. Only the upper and lower limiting sulci of the Island are pres
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. Human embryology and morphology. Embryology, Human; Morphology. 216 HUMAN EMBRYOLOGY AND MORPHOLOGY. Island of Eeil and its opercula are only well developed in the higher primates. Figs. 178, 179 and 180 represent the stages in its evolution. In Fig. 178 the condition in dog-like apes is sup. front intra-parietal „„„„„„ j?0 par-oca fis. affenspalte. island of Reil ant lim. sulcus (fronto-orbital) 1st temp. fis. occip. fis. Fig. 178.—The Island of Reil and Fissures on the lateral Aspect of the Brain of a dog-like Ape. represented. Only the upper and lower limiting sulci of the Island are present. The Island, which is small, is continuous anteriorly with the frontal lobe. In anthropoids (gorilla, etc.) the Island is larger; the upper and lower limiting sulci are present; an imperfect anterior limiting sulcus (fronto-orbital fissure) is present and partially separates the Island from the orbital surface of the frontal lobe. In man all three limiting sulci are present and completely isolate the Island, and occasionally this is the condition (Fig. 179 E) in the higher anthropoids, but it is in man only that the orbital operculum grows up and meets with the other opercula. This can be the more easily understood when it is remembered that the orbital part of the 3rd frontal convolution is connected with speech. Temporary Fissures.—In the 3rd month of foetal life the cerebral vesicles have thin walls, and when extracted from the head show several fissures. These fissures, unlike those which appear at the sixth and seventh months on the cortex of the brain, are really inflections of the whole thickness of the cerebral wall and are variable in number and position. It is possible. 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 work.. Keith, Arthur, Sir, 1866-1955. London : E. Arnold