. Comparative anatomy. Anatomy, Comparative. 6io COMPARATIVE ANATOMY and trunk segments as serially homologous. It has since been demon- strated that visceral arches differ from ribs, both in development and in relations to other parts, and hence are not homologous. Gegenbaur called attention to the fact that the presence of membrane bones in the skull makes it impossible to compare the skull with a vertebra. Like Huxley, Gegenbaur counted nine segments in the head. These he regarded as serially homologous with those of the trunk. Head Segments According to Gegenbaur Primary visceral skeleton
. Comparative anatomy. Anatomy, Comparative. 6io COMPARATIVE ANATOMY and trunk segments as serially homologous. It has since been demon- strated that visceral arches differ from ribs, both in development and in relations to other parts, and hence are not homologous. Gegenbaur called attention to the fact that the presence of membrane bones in the skull makes it impossible to compare the skull with a vertebra. Like Huxley, Gegenbaur counted nine segments in the head. These he regarded as serially homologous with those of the trunk. Head Segments According to Gegenbaur Primary visceral skeleton ISt arch. 2nd arch 3rd arch. 4th arch. 5th arch. 6th arch. 7th arch. 8th arch. 9th arch. Modified visceral skeleton ist upper labial cartilage 2nd upper and ist lower labial cartilages Mandibular arch Hyoid arch ist gill arch 2nd gill arch 3rd gill arch 4th giU arch 5 th gill arch Nerve ^ Trigemini Ramus 21 Ramus 3; Facial Glossopharyngeal Ramus, i vagi Ramus, 2 vagi Ramus, 3 vagi Ramus, 4 vagi Embryological Phase. With the rise of the science of embryology during the latter part of the nineteenth century, the head problem entered SCLEROTOME- HYPOCHORDA. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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