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Uterus didelphys (from Ancient Greek di- 'two' and delphus 'womb'; sometimes also uterus didelphis) represents a uterine malformation where the uterus is present as a paired organ when the embryogenetic fusion of the Müllerian ducts fails to occur. As a result, there is a double uterus with two separate cervices, and possibly a double vagina ...
Some sources call this subfamily the "American opossums", [2] [6] while others use that term for the whole family of opossums, Didelphidae. [1] The term may be redundant, though, since all opossums are native to the Americas, while their distant Australian taxonomic relatives, in the suborder Phalangeriformes are referred to as possums in ...
A bicornuate uterus is an indication for increased surveillance of a pregnancy, though most women with a bicornuate uterus are able to have healthy pregnancies. [1] Women with a bicornuate uterus are at an increased risk of recurrent miscarriage, [2] [10] preterm birth, [2] [11] malpresentation, [2] [12] disruptions to fetal growth, [13] premature rupture of membranes, placenta previa and ...
Higgins says that while two completely separate uteruses are a rare anomaly, women who have the more common bicornuate uterus will likely have a pregnancy develop in the more developed “horn ...
The condition is much less common than these other uterine malformations: arcuate uterus, septate uterus, and bicornuate uterus. While the uterus didelphys is estimated to occur in 1/3,000 women, [3] the unicornuate uterus appears to be even more infrequent with an estimated occurrence of about 1/4,000. [2]
The largest difference between the opossum and non-marsupial mammals is the bifurcated penis of the male and bifurcated vagina of the female (the source of the term didelphimorph, from the Greek didelphys, meaning "double-wombed"). [38] Opossum spermatozoa exhibit sperm-pairing, forming conjugate pairs in the epididymis.
The order Didelphimorphia consists of one family, Didelphidae, which is divided into the subfamilies Caluromyinae, Glironiinae, Hyladelphinae, and Didelphinae.Caluromyinae contains 4 species in 2 genera, Glironiinae and Hyladelphinae each contain a single species, and Didelphinae contains 87 species in 14 genera, as well as the extinct red-bellied gracile opossum, which was last seen in 1962.
The higher taxonomy used for the ungulates of this order is based primarily on the Handbook of the Mammals of the World, Volume 2 on hoofed mammals, including the subfamily and tribal affiliations in each family. The order includes about 242 recognized ungulate species, along with 6 recently extinct species.