Archive image from page 210 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 Fig. 112.—A. Transverse section through the twelfth somite of a 16 s em- bryo. B. Three sections behind A to show the nephrostome of the same pro- nephric tubule. V. c. p., Posterior cardinal vein. c. C, Central canal. Ms'ch., mesen- chyme, n. Cr., Neural crest. N'st. Nephrostome. n. T., Neural tube, pr'n. 1, 2, Distal and proximal divisions of the pronephric tubule. The primary pronephric tubules are originally attached to the nephrotom
Archive image from page 210 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 Fig. 112.—A. Transverse section through the twelfth somite of a 16 s em- bryo. B. Three sections behind A to show the nephrostome of the same pro- nephric tubule. V. c. p., Posterior cardinal vein. c. C, Central canal. Ms'ch., mesen- chyme, n. Cr., Neural crest. N'st. Nephrostome. n. T., Neural tube, pr'n. 1, 2, Distal and proximal divisions of the pronephric tubule. The primary pronephric tubules are originally attached to the nephrotome opposite the posterior portion of the somite, about half-way between the somite and the lateral plate (Figs. 112 and 113). The part of the nephrotome between the attach- ment of the primary tubule and the lateral plate is continuous with the primary tubule and forms a supplementary part of the complete pronephric tubule; the remainder of the nephrotome then becomes converted into mesenchyme and the connection with the somites is lost (Figs. 112 and 113). Thus each pro- nephric tubule forms a connection between the Wolffian duct
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