Mammary glands in male marsupials. 2. Development of teat primordia in Didelphis virginiana and Monodelphis domestica.
Mammary glands in male marsupials. 2. Development of teat primordia in Didelphis virginiana and Monodelphis domestica.
复制标题
雄性有袋动物的乳腺。
DOI：
10.1071/rd9910295
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
VandeBerg,JL
中科院分区：
文献类型：
--
作者：
Robinson,ES;Renfree,MB;Short,RV;VandeBerg,JL
两个didelphid有袋类，弗吉尼亚Didelphis和Monodelphis的南极，年轻人和成年人的性别，外部检查的证据乳腺发育。雌性幼鱼乳头数为成年雌鱼的典型值（13-15）。virginiana; M.南极洲）。雄性幼鱼乳头数量变化较大，但始终低于雌性幼鱼，大多数幼鱼的乳头数量为2 - 4个。乳头也存在于这两个物种的成年男性，在类似的数量和位置的年轻男性。以前没有任何关于成年雄性有袋动物乳头存在的报道。在研究最彻底的澳大利亚有袋类动物中，在任何发育阶段都没有雄性乳房原基的记录。我们的研究结果加强了这样一种观点，即在男性乳腺表达的调节中，两种有袋动物谱系之间存在二分法。
Young and adults of both sexes of two didelphid marsupials, Didelphis virginiana and Monodelphis domestica, were examined externally for evidence of mammary gland development. Female young possessed teat numbers typical of adult females (13-15 in D. virginiana; 11-13 in M. domestica). Male young showed variable teat numbers which were always low compared with females, with the majority possessing 2-4 in anterior positions. Teats were also present in adult males of both species, in similar numbers and locations to those of young males. There are no previous reports of the presence of teats in any adult male marsupials. No mammary primordia in males have been recorded at any stage of development in the most thoroughly studied Australian marsupials. Our findings strengthen the view that there is a dichotomy between the two marsupial lineages in the regulation of male mammary gland expression.