. A laboratory manual and text-book of embryology. Embryology. CHICK EMBRYO OF TWENTY-SEVEN SEGMENTS 73 nection of the vitelline artery with the aorta does not show, as the section is cut somewhat obliquely. The other structures were described in connection with Fig. 47. Section Caudal to the Mesodermal Segments (Fig. 64).—The mesodermal seg- ments are replaced by the segmental zone, a somewhat triangular mass of undifferentiated mesoderm from which later are formed the segments and nepkrotomes. The notochord is larger, Mes. Segment" Descending aorta Somcdopleure Son. mes Spinal cord Ecto
. A laboratory manual and text-book of embryology. Embryology. CHICK EMBRYO OF TWENTY-SEVEN SEGMENTS 73 nection of the vitelline artery with the aorta does not show, as the section is cut somewhat obliquely. The other structures were described in connection with Fig. 47. Section Caudal to the Mesodermal Segments (Fig. 64).—The mesodermal seg- ments are replaced by the segmental zone, a somewhat triangular mass of undifferentiated mesoderm from which later are formed the segments and nepkrotomes. The notochord is larger, Mes. Segment" Descending aorta Somcdopleure Son. mes Spinal cord Ectoderm Nolo chord Somatic mesoderm. Splanchnopleure Coelo ^Splanchnic mesoderm ^Entoderm Fig. 62.—Transverse section through the seventeenth pair of mesodermal segments of a fifty-hour chick embryo. X 50. Nephrott Spina I cord Ectoderm Somatopkurfi Nephrotome Somatic mesoderm. 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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