Histological Studies of the Prenatal and Postnatal Development of the Ovary in the Golden Hamster (Cricetus Auratus)

• Nakano Atsushi

  Department of Anatomy, Nagoya University School of Medicine

抄録

Histological investigations of prenatal and postnatal development of the ovary of hamsters elucidated the following: Development is divisible into three stages: 1. The indifferentiation stage (approximately 6 to 11 mm CRL,10 to 12 days of gestation): Where the primordium indicates no sex, appears as a few-layered thickening of the celomic epitheliumgerminal epithelium containing primordial germ cellson the ventromedial surface of the mesonephros, which soon proliferates actively into cell conglomerates to fill the entire extent of the primordium.2. The preparatory differentiation stage subdivisible into two parts: In the first part the cell conglomerates develop into cords in the deep zone of the primordiummedullary cords in 14 mm (13 days) and in the superficial zone cortical cords in about 21 mm (14 days). Thus, the primordium is identifiable as the female sex at 14 days. In the second part (approximately 28-32 mm,15-16 days) the cords are seen separating into egg clusters which further divide into smaller ones. During these stages, the primordial germ cellsoogoniain the germinal epithelium increase by mitosis and are added in order to the cell conglomerates, medullary and cortical cords and their clusters, but at almost the same time degeneration begins to occur and continues until later.<BR>3. The definitive differentiation stage (from immedia t ely after birth to adult): This stage contain many important changes leading to the final development of the ovary. Oogonia change to oocytes passing through the beginning stages of meiosis. The oocytes enter a stage of rest after the diplotene stage and grow with the formation of follicles. The proliferation of the germinal epithelium is now ceasing with the formation of the tunica albuginea and remains as small invaginations which contain no mitotic figures of oogonia after 4 days nor meiotic figures of oocytes after 10 days.

収録刊行物

• Okajimas Folia Anatomica Japonica

  Okajimas Folia Anatomica Japonica 35 (1-3), 183-217, 1960

  Editorial Board of Okajimas Folia Anatomica Japonica

キーワード

• Anatomy

詳細情報

• CRID: 1390282680437222272
• NII論文ID: 130004990287
• DOI: 10.2535/ofaj1936.35.1-3_183
• ISSN: 0030154X
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可