Product Code Database
This historic book may have numerous typos and missing text
Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...(Wolffian) duct. g. Ant. division right post-cardinal vein. h. Caudal pole of right kidney, i. Caudal pole of left kidney.;. R. umbilical A. A:. L. umbilical A. I. Duct of allantois. m. Intestine. n. Bladder. o. Common terminal segment of mesonephric (Wolffian) and metanephric (ureter) ducts. p. Remnant of connection between ventral and dorsal (intestinal) cloacal divisions, s. c. Stalk of allantois. q. Caudal gut. r. Left ureter, s. Right ureter. Fig. 94 shows in profile, viewed from the right side, the plastic reconstruction of the early development of the permanent kidney in a cat embryo of 6.8 mm. magnified 50 diameters, in a stage corresponding to the schema of Fig. 91. The right Wolffian body, still a very voluminous organ in this stage, is shown divided near its caudal extremity to exhibit the renal metanephric bud situated on its mesal aspect and ventrad of the aorta. The ureter appears as an outgrowth from the dorsal wall of the Wolffian duct near its cloacal termination, turning dorsad to its engagement in the mass of the renal cellular mesenchyme. Wolffian duct and ureter possess a short and relatively wide terminal segment, already in the process of opening out to be included in the genito-urinary sinus. The end gut is still connected with the cloaca by a narrow channel, formerly described as the stalk of the allantois, but the separation of the primitive urogenital and intestinal compartments of the cloaca has nearly been completed. The greater part of the ventral and cephalic cloacal division has been devoted to the formation of the urinary bladder, prolonged at the vertex into the allantoic duct (urachus). The umbilical (hypogastric) arteries cross the ventral division of the post-cardinal veins and laterad...
|
|
