Assertion: placenta | /r/AtLocation | the decidua
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: The placenta is usually attached to the decidua, but in some few instances the condition of placenta accreta or increta is found, in which partial or complete atrophy of the uterine mucosa, due to various pathological states, is present and in which, owing to defective development of the decidua the villi penetrate to the uterine muscle and cause damage or partial destruction.