. Anatomy, descriptive and applied. Anatomy. 1426 THE UBINOGENITAL ORGANS Ureter, Wolffian duct MiWei lan duct Bladder Symphysis pvt)^''^^^ cloaca which ultimately becomes the bladder (Fig. 1205). The manner in which this separation is brought about is not fully known.' The secretory tubules of the kidney become arranged into pyramidal masses or lobules, and the lobulated condition of the kidneys exists for some time after birth, while traces of it may be found even in the adult. The kidney of the ox and many other animals remains lobulated throughout life. The Urethra.—In the female the lu-et
. Anatomy, descriptive and applied. Anatomy. 1426 THE UBINOGENITAL ORGANS Ureter, Wolffian duct MiWei lan duct Bladder Symphysis pvt)^''^^^ cloaca which ultimately becomes the bladder (Fig. 1205). The manner in which this separation is brought about is not fully known.' The secretory tubules of the kidney become arranged into pyramidal masses or lobules, and the lobulated condition of the kidneys exists for some time after birth, while traces of it may be found even in the adult. The kidney of the ox and many other animals remains lobulated throughout life. The Urethra.—In the female the lu-ethra is formed from the upper part of the urinogenital sinus—viz., that part which lies above the openings of the Wolffian and INIiillerian ducts. The portion of the sinus below these openings becomes gradually shortened, and it is ultimately opened out to form the vestibule, and in this manner the lu-ethra and vagina come to open separately on the surface. Wood-Jones regards the female uretlira as "the cloacal remnant in its simplest form," and points out that "it does not remain tubular throughout fetal life, but is for a time obliterated more or less completely by the proliferation of the vaginal ; Developmentally considered, the male urethra consists of two parts—(1) the prostatic and membranous portions, which are derived from the iffinogenital sinus, and correspond to the whole of the female urethra; (2) the penile portion, which is formed by the fusion of the inner genital folds. The prostate gland originally consists of two separate portions, each of which arises as a series of diverticular buds from the epithelial lining of the urinogenital sinus, between the third and fourth months. These buds become tubular, and form the glandular substance of the two lobes, which ultimately meet and fuse behind the uretlira and also extend on to its ventral aspect. The third or middle lobe is formed as an extension of the lateral lobes between the comm
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
