cavity

The interior of this ring -- in general -- forms the cavity or pore where only certain substances "fit."

This now-you-see-it-now-you-don't type of cavity is called a "latent pore."

They created a new exception for ectopic pregnancies, a potentially fatal condition where the embryo attaches outside the uterine cavity, and for cases where a patient’s membranes rupture prematurely before viability, which introduces a high risk of infection.

Its brain cavity, which is divided into segments, has revealed the ancestral “nub” of the specialist, segmented heads of modern insects, spiders and crabs that later evolved their various appendages, such as antennae, mouthparts and eyes.

When Christina Cardenas visited her husband in 2019 at the California Correctional Institution in Tehachapi, she was forced to undergo a traumatic, hours-long cavity search that involved her stripping, being X-rayed and squatting over a mirror, she said.