. A laboratory manual and text-book of embryology. Embryology. THE GENITAL GLANDS AND DUCTS—OVARY 221 tubules anastomose and form the tubuli contorti. Their proximal portions remain straight as the tubuli recti. The rete testis becomes a network of small tubules which finally unite with the collecting tubules of the mesonephros (see p. 225). The primitive genital cells of the testis cords form the spermatogonia of the spermatic tubules and from these at puberty are developed the spermatogonia (p. 24). The indifferent cells of the tubules become the sustentacular cells (of Sertoli) of the adult

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. A laboratory manual and text-book of embryology. Embryology. THE GENITAL GLANDS AND DUCTS—OVARY 221 tubules anastomose and form the tubuli contorti. Their proximal portions remain straight as the tubuli recti. The rete testis becomes a network of small tubules which finally unite with the collecting tubules of the mesonephros (see p. 225). The primitive genital cells of the testis cords form the spermatogonia of the spermatic tubules and from these at puberty are developed the spermatogonia (p. 24). The indifferent cells of the tubules become the sustentacular cells (of Sertoli) of the adult Stock Photo
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. A laboratory manual and text-book of embryology. Embryology. THE GENITAL GLANDS AND DUCTS—OVARY 221 tubules anastomose and form the tubuli contorti. Their proximal portions remain straight as the tubuli recti. The rete testis becomes a network of small tubules which finally unite with the collecting tubules of the mesonephros (see p. 225). The primitive genital cells of the testis cords form the spermatogonia of the spermatic tubules and from these at puberty are developed the spermatogonia (p. 24). The indifferent cells of the tubules become the sustentacular cells (of Sertoli) of the adult
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. A laboratory manual and text-book of embryology. Embryology. THE GENITAL GLANDS AND DUCTS—OVARY 221 tubules anastomose and form the tubuli contorti. Their proximal portions remain straight as the tubuli recti. The rete testis becomes a network of small tubules which finally unite with the collecting tubules of the mesonephros (see p. 225). The primitive genital cells of the testis cords form the spermatogonia of the spermatic tubules and from these at puberty are developed the spermatogonia (p. 24). The indifferent cells of the tubules become the sustentacular cells (of Sertoli) of the adult testis. Primitive genital cells of the intermediate cords are transformed into large pale cells which, after puberty, are numerous in the inter- stitial connective tissue and hence are called interstitial cells. The intermediate cords themselves are resorbed, but the connective tissue sheaths of the tubules unite to form septula which extend from the mediastinum testis to the tunica Mesorc/iium- Intemediaie Coras. Rete testis Genital cell V;. ::;,;«- * V. 1_ Tunica —Testis cord Fig. 219.—Section through the testis of a 100 mm. fetus. X 44. albuginea. The latter becomes a relatively thick layer in the adult testis and is so called because of its whitish appearance. Anomalies.—The testis may be congenitally absent, the glands may be fused or they may fail to descend into the scrotum (cryptorchism). Duplications of the testis are of rare occur- rence. The Differentiation of the Ovary.—The primitive ovary, like the testis, consists of an inner epithelial mass and an outer epithelial layer. Much more slowly than in the testis the ovarian characters appear. In embryos of 50 to 80 mm. the inner epithelial mass composed of indifferent and primitive genital cells becomes less dense centrally and bulges into the mesovarian (Fig. 220). There may be distinguished a dense outer cortex beneath the epithelium, a clearer medullary zone containing large genital cells, and a dense ce

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