Development of the penis and clitoris in the tammar wallaby, Macropus eugenii
Development of the penis and clitoris in the tammar wallaby, Macropus eugenii
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DOI：
10.1007/s004290050243
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发表时间：
1999-05-01
期刊：
影响因子：
--
通讯作者：
Renfree, MB
中科院分区：
文献类型：
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作者：
Butler, CM;Shaw, G;Renfree, MB
阴茎从中性阶段到两性异形的发育，在任何有袋动物中都没有描述过。本研究描述了绒螯袋鼠阴茎发育过程中的形态学和组织学变化。阴茎和阴蒂在鼓膜上的发育与真兽目哺乳动物中同样器官的发育模式非常接近。出生时男女两性都存在的泌尿生殖板在产后约70天（p.p.）时挖空，形成泌尿生殖沟。男性阴茎的生长比女性更快，这导致了大约产后100天的两性异形。在男性中，泌尿生殖沟在这个时候第二次闭合，并在中线融合，到产后128天，阴茎尿道完全形成。在女性中，凹槽保持开放。从尿生殖沟形成到成年，阴蒂的形态变化不大。阴茎在鼓膜中的发育模式与真兽目哺乳动物相似。有强有力的证据表明，阴茎的发育是雄激素依赖于在tammar，但不寻常的是，它成为性二型的时候，雄激素含量的发展睾丸低。
The development of the phallus from the indifferent stage to sexual dimorphism has not been described in any marsupial. This study describes the morphological and histological changes occurring in the development of the phallus of the tammar wallaby. The development of the penis and clitoris in the tammar closely follow the most widely accepted model for the development of the same organs in eutherian mammals. The urogenital plate that is present in both sexes at birth hollows out to form a urogenital groove at approximately 70 days postpartum (p.p.). There is then greater growth of the phallus in males than in females, which results in sexual dimorphism in length approximately 100 days p.p. In males, the urogenital groove secondarily closes over at this time and fuses in the midline and by 128 days p.p. the penile urethra is fully formed. In females, the groove remains open. The clitoris changes little morphologically from the time of formation of the urogenital groove until adulthood. The pattern of development of the penis in the tammar is similar to that seen in eutherian mammals. There is strong evidence that penis development is androgen-dependent in the tammar, yet unusually it becomes sexually dimorphic at a time when androgen content of the developing testis is low.