. A laboratory manual and text-book of embryology. Embryology. Fig. 228.—Four stages in the development of the external genitalia in embryos of 24 to 34 mm. Indifferent stage: 1, phallus; _•, glans; 3, primitive urogenital opening; 4, genital tubercle or swelling; 5, anus; 6, coccyx (Tourneux in Heisler's Embryology). constitute the genital eminence. Cranially about the phallus the cloacal tu- bercle forms a crescent-shaped genital tubercle, which later gives rise to the right and left genital swellings. The phallus grows rapidly and into it extends the phallic portion of the urogenital sinus.
. A laboratory manual and text-book of embryology. Embryology. Fig. 228.—Four stages in the development of the external genitalia in embryos of 24 to 34 mm. Indifferent stage: 1, phallus; _•, glans; 3, primitive urogenital opening; 4, genital tubercle or swelling; 5, anus; 6, coccyx (Tourneux in Heisler's Embryology). constitute the genital eminence. Cranially about the phallus the cloacal tu- bercle forms a crescent-shaped genital tubercle, which later gives rise to the right and left genital swellings. The phallus grows rapidly and into it extends the phallic portion of the urogenital sinus. At the end of the phallus the epithelium of the sinus forms a solid urethral plate (Fig. 212). Along the anal surface of the phallus in the midline, the wall of the urogenital sinus breaks through to the ex- terior and forms the slitdike primitive urogenital aperture. In embryos of 21 to 28 mm., at the end of the phallus, the glans is marked off from the base by a cir- cular groove, the coronary sulcus (Figs. 225 and 228 B).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
Size: 1420px × 1761px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectembryology, bookyear1
