Assertion: amnion | /r/HasProperty | formed in the bat
Facets:
Source sentences:
text: Reference to this description and to the figures shows that in the bat and mole the amnion is formed, not as in the chick and rabbit by dorsal foldings of the somatopleure and fusion of these folds, but in situ by a breaking down of some of the cells of the inner cell mass and consequent cavity formation.