. Quain's elements of anatomy . h liw ao sp dd dj Fig. 798.—Teansveese section through the embrto op the chick and blastodermON THE SECOND DAY (from Kolliker). d d, hjpoblast; ch, chorda clorsalis ; u w, primordial vertebriB; m r, medullaryplates ; h, corneous layer or epiblast ; u iv h, cavity of the primordial vertebral mass ;7)12^, mesoblast dividing at sji; into hpl, body wall, and df, visceral wall; duct, beginning in the intermediate cell-mass. (See also figs. 690 and 692.) transverse caca directed inwards and connected externally with the mainsegmental duct. These tubes in
. Quain's elements of anatomy . h liw ao sp dd dj Fig. 798.—Teansveese section through the embrto op the chick and blastodermON THE SECOND DAY (from Kolliker). d d, hjpoblast; ch, chorda clorsalis ; u w, primordial vertebriB; m r, medullaryplates ; h, corneous layer or epiblast ; u iv h, cavity of the primordial vertebral mass ;7)12^, mesoblast dividing at sji; into hpl, body wall, and df, visceral wall; duct, beginning in the intermediate cell-mass. (See also figs. 690 and 692.) transverse caca 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 the PRIMITIVE TRO-GENITAL ORGANSIN THE EMBRYO PREVIOUS TOSEXUAL DISTINCTION. The hinder parts are shownchiefly in profile, but the Miil-lerian and Wolffian ducts are seenfrom the front, entire upon theleft and cut short upon the rightside. 3, ureter ; 4, urinarybladder ; 5, urachus; ot, the geni-tal ridge from which ovary ortesticle is afterwards foi-med;W, left Wolffian body ; x, an-terior part from which the conivasculosi areafterwards developed;, right and left Wolffian ducts;, right and left Miillerianducts uniting together and withthe Wolffian ducts in gc, thegenital cord ; ug, 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 tiiles. In its primary form, therefore,the segmental organ might be described as consi
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