from The Century Dictionary and Cyclopedia
- n. In embryology, the outer or serous cell-layer of the amnion in vertebrates.
Sorry, no etymologies found.
The spots on the outer wall of the serolemma are the roots of the branching chorion-villi, which are free at the border.
On the other hand, this is certainly not the case with the following embryonic forms, which we must describe as cenogenetic processes: the formation of the yelk-sac, the allantois, the placenta, the amnion, the serolemma, and the chorion -- or, generally speaking, the various foetal membranes and the corresponding changes in the blood vessels.
This is formed from the external layer of the amnion, the serolemma, or "serous membrane," the formation of which we shall consider presently; it surrounds the foetus and its appendages as a broad, completely closed sac; the space between the two, filled with clear watery fluid, is the serocoelom, or interamniotic cavity
But in the third sub-class of the mammals the serolemma forms, by invagination at its outer surface, a number of hollow tufts or villi, from which it takes the name of the chorion or mallochorion.
The wall of the allantois and the enveloping serolemma remains smooth and without villi, as in the birds.
AC amniotic cavity, UV yelk-sac or umbilical vesicle, ALC allantois, al pericoelom or serocoelom (inter-amniotic cavity), sz serolemma (or serous membrane), pc prochorion (with villi).)