. The physiology of reproduction. Reproduction. 114 THE PHYSIOLOGY OF REPRODUCTION vesicles of various sizes, each with an ovum, surrounded by an epithehum. These are called Graafian folUcles. Certain other structures, consisting of very large yellow-coloured ceDs en- closed by a branching network of connective tissue, are also often found. These are the corpora lutea or discharged folhcles to be described more fullv later. The stroma contains, further, a varying number of epitheloid interstitial cells. In order to gain a proper understanding of the structural. Fig. 19.—Section through ovary o
. The physiology of reproduction. Reproduction. 114 THE PHYSIOLOGY OF REPRODUCTION vesicles of various sizes, each with an ovum, surrounded by an epithehum. These are called Graafian folUcles. Certain other structures, consisting of very large yellow-coloured ceDs en- closed by a branching network of connective tissue, are also often found. These are the corpora lutea or discharged folhcles to be described more fullv later. The stroma contains, further, a varying number of epitheloid interstitial cells. In order to gain a proper understanding of the structural. Fig. 19.—Section through ovary of cat. (From Schron.) 1, Outer surface; 1', attached border; 2, fibrous central stroma; 3, peri- pheral stroma ; 4, blood-vessels ; 5, young follicles; 6, 7, 8, 9, and 9', larger developing follicles ; 10, corpus luteum. and functional relations of the different parts of the ovary, it is necessary to make some study of its developmental history. Pfliiger ^ appears to have been the first to regard the ova ^ and epithehal cells of the Graafian folhcles as originating either in the form of ingrowths simulating tubular glands, or as sohd columns of cells from that embryonic layer which Waldeyer afterwards designated the germinal epithehum. The tubular ingrowths had already been noticed by Valentin,^ who, however, ^ Pfliiger, Ueber die Eierstocke der Sdugethiere und des Menschen, Leipzig, 1867. ' The mammalian ovum was discovered by von Baer (Ueber Entwicke- lungsgeschichte der Thiere-Beobachtung und Rejlexion, vol. i., Konigsberg, 1828). In 1861 Gegenbaur showed that the vertebrate ovum was a single cell. ' Valentin, " Ueber die Entwickelung der FoUikel in dem Eierstocke der Saugethiere," Midler's Arch., 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 Marshall, F. H. A. (Francis Hugh Adam), 18
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