. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. STAGE m Hi, SHORTLY BEFORE HATCHING ELENCEPHALON ROOT OF VAGUS NERVE SOMITE n GANGLION NODOSUM OF THE VAGUS NERVE. PRONEPHRIC TUBULE Fig. 346. The developing pronephric kidney in the frog, Rana sylvatica (A-C and E, redrawn from Field, 1891, Bull. Mus. Comp. Zool. at Harvard College, vol. 21. E con- siderably modified). (A) Transverse section through developing second pronephric tubule of frog embryo at a time when the neural tube is completely cl
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. STAGE m Hi, SHORTLY BEFORE HATCHING ELENCEPHALON ROOT OF VAGUS NERVE SOMITE n GANGLION NODOSUM OF THE VAGUS NERVE. PRONEPHRIC TUBULE Fig. 346. The developing pronephric kidney in the frog, Rana sylvatica (A-C and E, redrawn from Field, 1891, Bull. Mus. Comp. Zool. at Harvard College, vol. 21. E con- siderably modified). (A) Transverse section through developing second pronephric tubule of frog embryo at a time when the neural tube is completely closed, two gill fundaments are present and the otic vesicle is a shallow depression. (B) Same tubule at about the time of hatching. (C) Section through first pronephric tubule at 8 mm. stage. (D) Transverse section through second pronephric tubule, see line d, fig. 346F, of 18 mm. Rana pipiens tadpole. (E) Entire pronephric kidney of one side of 8 mm. R. sylvatica embryo. (F) Schematic reconstruction of 18 mm. R. pipiens tadpole look- ing down from dorsal area upon the pronephric kidneys and the developing mesonephric kidneys, 779. 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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