. A laboratory manual and text-book of embryology. Embryology. the Vein Rumbilical arte/]' Jail Mesonephric duct Spinal cord. Nohchord Fig. no.—Transverse sec- tion through the primitive seg- ments and spinal cord of a 6 mm. pig embryo. X 45- Fir,, in.—Transverse section through the umbilical vessels, allan- tois and cloaca of a 6 mm. pig embryo. X 45. anlage of a vertebra. From it is developed also connective tissue. A pair of spinal nerves and spinal ganglia are developed opposite each somite, and pairs of small vessels arc seen between the segments. These are dorsal intersegmental arteries.
. A laboratory manual and text-book of embryology. Embryology. the Vein Rumbilical arte/]' Jail Mesonephric duct Spinal cord. Nohchord Fig. no.—Transverse sec- tion through the primitive seg- ments and spinal cord of a 6 mm. pig embryo. X 45- Fir,, in.—Transverse section through the umbilical vessels, allan- tois and cloaca of a 6 mm. pig embryo. X 45. anlage of a vertebra. From it is developed also connective tissue. A pair of spinal nerves and spinal ganglia are developed opposite each somite, and pairs of small vessels arc seen between the segments. These are dorsal intersegmental arteries. Section through the Umbilical Vessels, Allantois and Cloaca (Fig. in).— We have now studied sections at various levels of the 6 mm. embryo to near the end of the series. We shall next examine sections through the caudal region and study the anlages of the uro- genital organs. Owing to the curvature of the embryo, we will now be going cephalad in our series. The first section passes through the bases of the limb buds at the level where the allantoic stalk, curving inward from the umbilical cord, opens into the cloaca. At either side of the allantoic stalk may be seen oblique sections of the umbilical arteries and lateral to these the large left and small right umbilical vein. The mesonephric ducts occupy the mesonephric ridges which project into small caudal prolongations of the ccelom. Midway between the ducts lies the hind-gut, dorsal to the cloaca. The tip of the tail is seen in section to the left of the 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
