A treatise on the science and practice of midwifery / By W. S. Playfair.
- William Smoult Playfair
- Date:
- 1885
Licence: Public Domain Mark
Credit: A treatise on the science and practice of midwifery / By W. S. Playfair. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
86/708 page 78
![brane. In most of the lower aninuils tlie zona pellucida is perforated by nnnierons very minnte pores, only visible inuler the highest powers of the microscope; in others there is a distinct aperture of a larger size, the micropyle, allowing the passage of the spermatozoa into the interior of the ovule. It is possible that similar apertures may exist in the human ovule, but they have not been demonstrated. Within'the zona pellucida some embryologists describe a second fine membrane, the exist- ence of which has been denied by Bischoff. The_C'avity of the ovule is filled with a viscid yellow fluid, the yelk, containing,numerous granules. It entirely fills the cavity, to the'waTlsof which it is non-adherent. In the centre of the yelk in young, and aj_some ]3ortion of its ]3eripherv_ln mature ovules, is situated the_.r/r///;/;/^//rc>J^?'c/<, which is a clear circular vesicle, refracting light stronglv, and about -^t\\ of a line in diameter. It contains a few granules, and a nucleolus, or gerijiiiiaL^pgt, which is sometimes double. ' ' ^ From within outward, therefore, we find— 1. The germinal is^ot; round this 2. The germinal vesicle, contained in 3. The yelk, which is surroiuided by the 4. Zona pellaekla, M'ith its layers of columnar epithelial cells. These constitute the ovule. The ovule is contained in— The Graafian follicle, and lies in that part of its epithelial lining called the— Discus 2^1'oHgerus, the rest of the follicle being occupied by the liquor folliculi. Round these we have the epithelial lining or membrana granulosa, and the external coat, consisting of the tunica propria and the tunica fibrosa. TJie^^s^els^inxl^Nerves^of_Jh€__Oyciry.—The vascular supply of the ovary is complex. THitT^tei'ies^^ci^^ at the hilnm, penetrating the stroma in a spiral curve, and are ultimately distributed in a rich capil- Fic4. 39. Bulb of Ovary, r. Uterus, o. Ovary ami utoin-ov.niiaii iijianiciit. r. Fallopian tiibn. 1. T'tnin-nvariaii vein, form ovariau plexus. 3. Coniineuceuieiit uf spermatic vein. I'ampini- larv plexus to the follicles. The large veins unite freely with each other, and form a vascular and erectile plexus, continuous with that sur- ronnding the uterus, called the bulb of the ovary (Fig. 39). Lymphat- ics and nerves exist, but their mode of termination is unknown.](https://iiif.wellcomecollection.org/image/b2121072x_0086.jp2/full/800%2C/0/default.jpg)
