Quain's elements of anatomy . into hpl, body wall, and df, visceral wall; U7ig,Wolffian duct, beginning in the intermediate cell-mass. (See also figs. 690 and 692.) transverse caeca directed inwards and connected externally with the mainsegmental duct. These tubes in the lower vertebrates, and in reptilesamong the amniota, correspond closely in number with the vertebral ormuscular somites in the region which they occupy ; but in birds andmammals, though at first nearly so corresponding, they come later to Fig. 799,. Fig. 799. ?— Diagram op theprimitive uro-genital organsIN the embryo previous
Quain's elements of anatomy . into hpl, body wall, and df, visceral wall; U7ig,Wolffian duct, beginning in the intermediate cell-mass. (See also figs. 690 and 692.) transverse caeca directed inwards and connected externally with the mainsegmental duct. These tubes in the lower vertebrates, and in reptilesamong the amniota, correspond closely in number with the vertebral ormuscular somites in the region which they occupy ; but in birds andmammals, though at first nearly so corresponding, they come later to Fig. 799,. Fig. 799. ?— Diagram op theprimitive uro-genital organsIN the embryo previous to SEXUAL distinction. The hinder parts are shownchiefly in profile, but the Miil-lerian and Wolfiian ducts are seenfrom the front, entire uijon theleft and cut short upon the rightside. 3, ureter ; 4, urinarybladder ; 5, urachus; ot, the geni-tal ridge from which ovary ortesticle is afterwards formed;W, left Wolffian body ; x , an-terior part from which the conivasculosi are afterwards developed;WAV, right and left Wolffian ducts;, right and left Miillerianducts uniting together and withthe Wolffian ducts in gc, thegenital cord ; ^ig, sinus urogeni-talis; i. lower part of the intes-tine ; cl, cloaca ; cp, elevationwhich becomes clitoris or penis;Is, fold of integument from whichthe labia majora or scrotum areformed. be more numerous by the addition both of original and of secondary may be named the segmental tubes. In its primary form, therefore,the segmental organ might be described as c
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