. Comparative anatomy. Anatomy, Comparative. X- RAMUS OORSALIS \\ ARTERY---^. -VX - SEGMENTAL SOMATIC / / INTERMEDIATE ART VISCERAL ARTERY"- " RAMUS VENTRAUS". A DIAGRAM OF ARTERIES IN HEAD REGION. B ARTERIES IN TRUNK REGION. Fig. 315.—Diagrams illustrating the relations of somatic and visceral arteries in A, Head and B, Trunk. The coelom in the head region is embryonic and transient. (Redrawn from Corning, after Young and Robinson in Cunningham's Anatomy.) with the dorsal aorta. The vessel which connects the right pulmonary artery with the right dorsal aorta degenerates. The fi
. Comparative anatomy. Anatomy, Comparative. X- RAMUS OORSALIS \\ ARTERY---^. -VX - SEGMENTAL SOMATIC / / INTERMEDIATE ART VISCERAL ARTERY"- " RAMUS VENTRAUS". A DIAGRAM OF ARTERIES IN HEAD REGION. B ARTERIES IN TRUNK REGION. Fig. 315.—Diagrams illustrating the relations of somatic and visceral arteries in A, Head and B, Trunk. The coelom in the head region is embryonic and transient. (Redrawn from Corning, after Young and Robinson in Cunningham's Anatomy.) with the dorsal aorta. The vessel which connects the right pulmonary artery with the right dorsal aorta degenerates. The fifth pair of arches degenerate soon after their appearance. Changes in the Embryonic Circulation. The vascular system of a mm. to mm. embryo includes paired dorsal aortae from which are given off intersegmental vessels to the body-wall, and a series of vitelline arteries to the yolk-sac. Blood is returned to the sinus venosus of the heart through vitelline veins from the yolk-sac and paired umbilical veins from the placenta. In embryos of mm. to mm., blood is returned from the head to the heart by the paired precardinal veins. At this stage, six pairs of vitelline arteries carry blood to the yolk-sac. In embryos of mm., postcardinal veins join the ptecardinal veins to form the common cardinal veins, the ductus Cuvieri. These, together with the umbilical and vitel- line veins, return blood to the sinus venosus. Also, at this stage, the paired dorsal aortae begin to unite into a median unpaired trunk. In the head region, however, this fusion does not occur, and the paired dorsal aortae persist as the internal carotids of the adult body. The vitelline. 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.
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