. The chordates. Chordata. 84 Basic Structure f Vertebrates ,r^$£ FIRST CERVICAL PRONEPHROS NEPHROGENIC. TISSUE METANEPHROS PRIMITIVE DUCT/. URETER RST LUMBAR Fig. 82. A diagram of pro-, meso-, and metanephroi in a 5-6 mm. human embryo. Somites are cross-hatched. (After Braus. Courtesy, Neal and Band: "Comparative Anatomy," Philadelphia, The Blakiston Company.) brates. In some cases—, Necturus—the nephrostomes persist in the adult, appealing as minute holes on the ventral surface of the kidney. Usually, however, the nephrostomes do not persist. In vertebrates other than fishes an
. The chordates. Chordata. 84 Basic Structure f Vertebrates ,r^$£ FIRST CERVICAL PRONEPHROS NEPHROGENIC. TISSUE METANEPHROS PRIMITIVE DUCT/. URETER RST LUMBAR Fig. 82. A diagram of pro-, meso-, and metanephroi in a 5-6 mm. human embryo. Somites are cross-hatched. (After Braus. Courtesy, Neal and Band: "Comparative Anatomy," Philadelphia, The Blakiston Company.) brates. In some cases—, Necturus—the nephrostomes persist in the adult, appealing as minute holes on the ventral surface of the kidney. Usually, however, the nephrostomes do not persist. In vertebrates other than fishes and amphibians, the embryonic mesonephric tubule ordinarily does not possess a nephrostome. The tubules of the meta- nephros never acquire nephrostomes. An important excretory mechanism common to both mesonephric and metanephric tubules is the renal or Malpighian corpuscle. The tubule produces a cup-shaped expansion, Bowman's capsule ( 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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