. The Anatomical record 1922-1923. Anatomy. SINGLE rMBILICAL ARTERY IN HUMAN FETUSES 329 ?/TorfcL. Fig. 3 Diagrammatic representation, ventral view, of the developing abdominal aorta, showing the normal development of the arteries of the lower limbs and umbilical cord. Both dorsal and ventral roots of the umbilical arteries are indicated. The several portions of the arterial system of special • interest in this paper are distinguished by hatching and stipple, and this method is adhered to uniformly in all subsequent figures (4 to 9). , radix ventralis; , radix dorsalis. The other abbre
. The Anatomical record 1922-1923. Anatomy. SINGLE rMBILICAL ARTERY IN HUMAN FETUSES 329 ?/TorfcL. Fig. 3 Diagrammatic representation, ventral view, of the developing abdominal aorta, showing the normal development of the arteries of the lower limbs and umbilical cord. Both dorsal and ventral roots of the umbilical arteries are indicated. The several portions of the arterial system of special • interest in this paper are distinguished by hatching and stipple, and this method is adhered to uniformly in all subsequent figures (4 to 9). , radix ventralis; , radix dorsalis. The other abbreviations do not need explanation. Arrows indicate the direction of blood flow. Fig. 4 Diagrammatic representation, ventral view, of the developing abdominal aorta, illustrating a condition in which the ventral umbilical arteries have failed to complete caudal migration and to establish secondary connections (dorsal roots) with the aorta. Fig. 5 Diagram showing abnormal development of the abdominal aorta as seen from the left side. The ventral umbilical arteries have failed to migrate caudally and have fused to form a single median vessel. They have also es- tablished dorsal root connections with the aorta. The normal position of the ventral umbilical roots is shown by broken lines. to the point of origin of the ventral umbiUcal roots in a condition represented by 2a and 5b or 4c. The sacral portion is, c) often missing, especially in sympodial monsters but, d) may 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 American Association of Anatomists; American Society of Zoologists. Philadelphia [etc. ] : The Wistar Institute of Anatomy and Biology [etc. ]
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1906
