. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. MESONEPHRIC RENAL UNITS ^7 ARISING BY CONDENSATION OF GROUPS OF CELLS WITHIN 15 NEPHROGENIC CORD - PRONEPHRIC IMESONEPHRIC) DUCT VESTIGIAL PRONEPHRIC TUBULE SECRETORY PORTION OF TUBULE. MALPIGHIAN BODY COELOM NEPHROSTOMAL / SECRETING CANAL MESONEPHRIC TUBULE DUCT Fig. 344. Regions of kidney origin within the vertebrate group; types of renal units formed. (A) The regions in the body where the diflferent types of vertebrate kidneys arise. The pronep
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. MESONEPHRIC RENAL UNITS ^7 ARISING BY CONDENSATION OF GROUPS OF CELLS WITHIN 15 NEPHROGENIC CORD - PRONEPHRIC IMESONEPHRIC) DUCT VESTIGIAL PRONEPHRIC TUBULE SECRETORY PORTION OF TUBULE. MALPIGHIAN BODY COELOM NEPHROSTOMAL / SECRETING CANAL MESONEPHRIC TUBULE DUCT Fig. 344. Regions of kidney origin within the vertebrate group; types of renal units formed. (A) The regions in the body where the diflferent types of vertebrate kidneys arise. The pronephric tubules and the pronephric duct are shown in black to emphasize the fact that this part of the developing renal system is a fundamental and necessary primordium without which later kidney development is distorted. (B) Differentiation of the anterior portion of the nephrotomic plate and the common method of origin of the pronephric duct. In the anterior region (toward the left in the figure) the nephrotomic plate segments into individual nephrotomes from each of which a renal tubule arises (see tubules 1 to 5). Tubules 6-9 is a vestigial area of tubule development. The anterior mesonephric region indicated by tubules 10 to 15, etc. In the anterior mesonephric area, , tubules 10 and 11, the individual tubules show a tendency to arise segmentally, but in more posterior mesonephric regions, , tubules 12 to 15, etc., the tubules arise through condensation of cellular masses within the nephrogenic cord. Hence, primitive (Continued on facing page.) 77Q. 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 Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston
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