placental clock

A hypothetical ‘timer’ which was once thought to be intrinsic to the placenta and to control the length of gestation.

placental clock

Obstetrics A hypothetical 'timer' that may be intrinsic to the placenta, and control length of gestation
References in periodicals archive ?
An early maternal message that it's a hostile world primes the placental clock for a CRH [corticotropin-releasing hormone] response later," he said.
Such a mechanism, which begins at the first trimester, is a placental clock that triggers the onset of labor.
McLean M, Bisits A, Davies J, Woods R, Lowry P, Smith R A placental clock controlling the length of human pregnancy.