ArticleScientific reports2013
Ultrasonography of wallaby prenatal development shows that the climb to the pouch begins in utero.
Article in Scientific reports, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
7 citing papers in PubMed, 17 citations in OpenAlex.
- Inflammation in the endometrium of the tammar wallaby (Macropus eugenii) at the time of birth.Reproduction & fertility · 2026Article
- The marsupial imprinted gene MLH1 has retrocopies in three marsupial families.Epigenetics & chromatin · 2026Article
- The extension of mammalian pregnancy required taming inflammation: Independent evolution of extended placentation in the tammar wallaby.Proceedings of the National Academy of Sciences of the United States of America · 2024Article
- Embryonic specializations for vertebrate placentation.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2022Review
- Self-tuition as an essential design feature of the brain.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2022Review
- Unique reproductive strategy in the swamp wallaby.Proceedings of the National Academy of Sciences of the United States of America · 2020Article
- Morphology and evolution of the oral shield in marsupial neonates including the newborn monito del monte (Dromiciops gliroides, Marsupialia Microbiotheria) pouch young.Journal of anatomy · 2017Article
Corrections and comments
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Authors and funding
8 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Marsupials have a functional placenta for a shorter period of time compared to that of eutherian species, and their altricial young reach the teats without any help from the mother. We have monitored the short intrauterine development of one marsupial, the tammar wallaby, with high-resolution ultrasound from reactivation of the 100-cell diapausing blastocyst to birth. The expanding blastocyst could be visualized when it had reached a diameter of 1.5 mm. From at least halfway through pregnancy, there are strong undulating movements of the endometrium that massage the expanding vesicle against the highly secretory endometrial surface. These unique movements possibly enhance exchange of uterine secretions and gases between the mother and embryo. There was a constant rate of development measured ultrasonographically from mid-gestation, regardless of when the blastocyst reactivated. Interestingly climbing movements by the fetus began in utero about 3 days before birth, mimicking those required to climb to the pouch.
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