Question

Write about the positioning of uterus in different species.

Answer 1

Position of the uterus in different organisms' females:

1. Different species have different regions of attachment in the uterus.
2. If more than one ovulation occurs in the ovary, there are more chances of migration to the opposite horn by one of its embryos as seen in ewes.
3. The litter-bearing species have an even distribution of embryos throughout the uterine horns, implying essential transuterine embryonic migration.
4. This is seen in pigs and cats, serving the need for allocation of even resources for the growth of the fetus.
5. It is in the endometrium of the uterine lumen that the initial attachment is seen in all domestic species.
6. There is a fast growth of tissues before initiation of attachment which develops into the placenta.
7. This transforms a spherical blastocyst into a filamentous one. Seemingly, in several species, this is the mechanical form through which each conceptus tries to occupy as much space of the uterus as possible.