. A laboratory manual and text-book of embryology. Embryology. TRANSVERSE SECTIONS 119 In the ventral portion of the section, the lover limb buds are prominent laterally. A large pair of arteries, the common iliacs, are given off from the aorta and may be traced into connection with the umbilical arteries. The large intestine supported by a short mesentery lies in the ccelom near the midline. On each side are the mesonephric folds, here small and each show- ing a section of the mesonephric duct and a single vesicular anlage of the mesonephric tubules. The mesonephric ducts are sectioned as the
. A laboratory manual and text-book of embryology. Embryology. TRANSVERSE SECTIONS 119 In the ventral portion of the section, the lover limb buds are prominent laterally. A large pair of arteries, the common iliacs, are given off from the aorta and may be traced into connection with the umbilical arteries. The large intestine supported by a short mesentery lies in the ccelom near the midline. On each side are the mesonephric folds, here small and each show- ing a section of the mesonephric duct and a single vesicular anlage of the mesonephric tubules. The mesonephric ducts are sectioned as they curve around from their position in the dorsal portion of the section. Section through the Primitive Segments and Spinal Cord (Fig. no).—This section is near the end of the series and as the body is here curved it is really a longitudinal section. At the left side of the spinal cord the oval cellular masses are the spinal ganglia cut across. The ectoderm, arching over the segments, indicates their position. Each segment shows an outer dense layer, the cutis plate, lying just be- neath the ectoderm. This plate curves lateral to the spindle shaped muscle plate which gives rise to the volun- tary muscle. Next comes a diffuse mass of mesenchyma. the sclerotome, which, eventually, with its fellow of the opposite side, surrounds the spinal cord and forms Spinal gang. Interseg- mental artery Muscle plate Cutis plate Sclerotome Ectoderm Spinal cord. the Vein Rumbilical arte/]' Jail Mesonephric duct Spinal cord. 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 Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectembryology, bookyear1
