Gonadal development in the opossum, Monodelphis domestica: the rete ovarii does not contribute to the steroidogenic tissues.
Gonadal development in the opossum, Monodelphis domestica: the rete ovarii does not contribute to the steroidogenic tissues.
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负鼠 Monodelphis Domestica 的性腺发育：卵巢网不参与类固醇生成组织。
DOI：
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发表时间：
1993
影响因子：
2.4
通讯作者：
Suzanne L. Ullmann
中科院分区：
文献类型：
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作者：
Philip Maitland;Suzanne L. Ullmann
对273只从新生到成年的动物的性腺进行了连续的组织切片观察。原始生殖细胞位于新生儿的后肠、背侧肠系膜和性腺原基，碱性磷酸酶阴性。睾丸在怀孕到出生的第13天分化，大约在半天后。睾丸索由支持前细胞组成，内含生殖细胞，分布于性腺周围。卵巢分化在第6天开始，此时皮质和髓质界限模糊，开始清晰可见。14d开始减数分裂，26d由胚泡细胞形成髓索，29d左右发育成颗粒细胞。卵巢网最早出现在性腺原基的门区。从第26天到第29天，它最大限度地穿透了卵巢长度的三分之二。结果表明，至少在出生后，中肾不参与卵巢的发育，颗粒细胞不是来源于卵巢，而是来源于延髓。
The gonads of 273 animals, ranging in age from newborn to adult, were examined in serial histological sections. Primordial germ cells were located in the hindgut, dorsal mesentery and gonadal primordia of neonates but were alkaline phosphatase negative. The testis differentiated between d 13 of gestation and birth, about half a day later. Testis cords, composed of pre-Sertoli cells and containing germ cells, were distributed peripherally in the gonad. Ovarian differentiation began on d 6, when an ill defined cortex and medulla became discernible. Meiosis commenced on d 14, medullary cords formed from blastema cells by d 26 and gave rise to granulosa cells around d 29. The rete ovarii was first observed in the hilar region of the gonad primordium. It penetrated maximally two thirds of the ovarian length between d 26 and d 29. It is concluded that, at least postnatally, the mesonephros does not contribute to the rete ovarii and that the granulosa cells are derived not from the rete but from the medullary cords.
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DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
羽田 正(編);(高橋分担執筆);橋本 雄;九州国立博物館(編)(橋本含む)
通讯作者：
九州国立博物館(編)(橋本含む)