. Chordate morphology. Morphology (Animals); Chordata. gill raker B ACIPENSER D TELEOST Figure 11-19. Interrelationships of vessels in the gill and as seen in semidiogrammatic anterior view, A and C, and in cross section, B and D. (After Goodrich, 1930) the interior opening of the gill pouches, and send vessels to the posterior and anterior hemibranchs of adjacent pouches. The efferent arteries draining adjacent hemibranchs are in- terconnected. The hyoid afferent serves only a posterior hemibranch. The hyoid efferent extends dorsally to the region of the h)'po- physes where it joins the carot
. Chordate morphology. Morphology (Animals); Chordata. gill raker B ACIPENSER D TELEOST Figure 11-19. Interrelationships of vessels in the gill and as seen in semidiogrammatic anterior view, A and C, and in cross section, B and D. (After Goodrich, 1930) the interior opening of the gill pouches, and send vessels to the posterior and anterior hemibranchs of adjacent pouches. The efferent arteries draining adjacent hemibranchs are in- terconnected. The hyoid afferent serves only a posterior hemibranch. The hyoid efferent extends dorsally to the region of the h)'po- physes where it joins the carotid stem. The external carotid arises directly from the efferent of the second branchial arch but receives contributions from the efferents of the first branchial arch. In development, the first aortic arch is the mandibular which appears at a stage of 40 somites. By 70 somites the mandibular arch is reduced in size and three other arches have appeared. The mandibular arch has lost its connection with the ventral aorta in an embryo of mm; this velar artery persists into the adult but along with its large post- orbital branch forms a part of the external carotid system. By 6 mm the arches have divided into an outer afferent and an inner efferent division. This relationship is not found in the adult, where both afferent and efferent vessels lie medial to the pouch. These vessels extend to the region of the in- ternal branchial opening and there divide into dorsally, laterally, and ventrally extending branches. Their branches. 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 Jollie, Malcolm. New York, Reinhold
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