Identifier: scienidw00lusk (find matches)
Title: The science and art of midwifery
Year: 1897 (1890s)
Authors: Lusk, William Thompson, 1838-1897
Subjects: Obstetrics Women Pathology
Publisher: New York, D. Appleton
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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elium and by the peristal-tic action of the circular muscular libers. Fecundation.—The precise point at which fecundation takes placehas been variously assigned by authors to the tubes, the uterus, and theovary. The question, however, up to the present time is a purelyspeculative one. The length of time required by the human ovum tocomplete the passage 1ioin the ovary to the uterine cavity is unknown;nor has ;i- yet the period of the extra-ovarian life of the ovum, whennot vivified by the contact of the nude element <»f generation, been de-termined. Single observations show that fecundation may take placein any part of the course described. The ordinary site of fecundationis a matter which remains to be decided by future investigations. spread likewise over the ovary, their probable action would consisl in drawing bothovary and tube toward tin1 median line. •Thiey, Gflttingen Nachrichten, 1862, p. 171. f Arch, I < ■ \ naek., vol. \\ i. p. 2 1. DEVELOPMENT OF THE OVUM. 4:;
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Fig. 31.—Spermatozoa from the humansubject (magnified eight hundreddiameters). (Luschka.i The semen, contact with which is essential to the fecundation ofthe ovum, is a thick, viscid, albuminous fluid, of a whitish color anda peculiar odor, which has been compared to that of the raspings ofbone. When examined by the microscope, it is found to containnumerous minute anatomical elements,termed spermatozoa. Each spermato-zoon consists of an oval head and a longfiliform extremity or tail. The head isflattened, and measures about flo*o0 ofan inch in width. When seen in pro-file, it presents a pyriform ajrpearance.The entire spermatozoon measures fromsor t° toit of an inch in length. The spermatozoa do not simply floatin the seminal fluid, but possess thecapacity of moving from place to place,as though endowed with volition. In-deed, as the observer sees them advance, now singly and now in shoals,now diving down and then rising again to the surface, now avoidingsome obstacle, or skillful

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