. Human embryology and morphology. Embryology, Human; Morphology. 86 HUMAN EMBRYOLOGY AND MORPHOLOGY. contraction of the tube muscle, caused by handling and cutting. In the infundibular and ampullary segments of the tube, the mucous membrane is thrown into long plicated folds shown in rd. lig. 'allopian tube plicae 'olffian duct mesosalpinx mesouarium ouaru Fig. 64.—Diagrammatic section of .the Broad Ligament and Fallopian Tube. section in Fig. 64. They are covered with ciliated epithelium, which urge the ovum towards the uterus. Within the tube impregnation usually takes place. If an o
. Human embryology and morphology. Embryology, Human; Morphology. 86 HUMAN EMBRYOLOGY AND MORPHOLOGY. contraction of the tube muscle, caused by handling and cutting. In the infundibular and ampullary segments of the tube, the mucous membrane is thrown into long plicated folds shown in rd. lig. 'allopian tube plicae 'olffian duct mesosalpinx mesouarium ouaru Fig. 64.—Diagrammatic section of .the Broad Ligament and Fallopian Tube. section in Fig. 64. They are covered with ciliated epithelium, which urge the ovum towards the uterus. Within the tube impregnation usually takes place. If an obstruction arrests the fertilized ovum in the tube, perhaps it may be a patch denuded of epithelium and cilia by gonorrheal inflammation, a tubular pregnancy is the result. The growing embryo, commonly about the second month, bursts the tube and falls within the broad liga- ment or into Douglas's pouch (Fig. 64). The History of the Ovum within the Fallopian Tube.— When the ovum enters the Fallopian tube, it is a cell of very considerable size ('2 mm. = -jhs in.) with a cell wall—the zona radiata (Fig. 63), a nucleus—the germinal vesicle, and a nucleolus —the germinal spot. Then, or before then, the ovum prepares for fertilization by the extrusion from its nucleus of first one, then another polar body, and, with the extrusion, the germinal vesicle becomes the female pronucleus. The polar bodies, which lie outside the protoplasm of the ovum, but within the zona radiata, are parts of the germinal vesicle, which are extruded with all the display of karyokinesis (Fig. 65 A). The meaning of the process has been much guessed at; the outstanding fact is that two parts of the ovum are segregated and are not involved in the subsequent developmental changes. What,. 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 wor
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
