Lumen
Vasoconstriction
A ceramic vessel with a spigot that is made to hang on a wall is called a "wall-mounted ceramic water dispenser."
The opening outside of the gastrula is called the blastopore. It is the initial opening that forms during gastrulation, where cells migrate to form the three germ layers.
An opening in a wall is typically called a doorway or an entrance. It can also be referred to as a portal or an aperture.
The opening hole of the eye is called the pupil. It is the black circular opening located in the center of the iris that allows light to enter the eye. The size of the pupil can change in response to different lighting conditions and emotions.
lumen - the central opening within a tube or hollow organ.
It is called the hatchway. If it is a round opening, it is called a scuttle. If it is a square opening it is called a hatch. Depending on the vessel and the location they can be "dogged" open.
dens
tunica intima
Tunica Intima
its called Shinkai no Kodoku
Vertebral foramen
blastopore
Lumen
A bowl-shaped area that forms around a volcano's central vent is called a crater.
blastopore
When a blood vessel bursts, the wall of the vessel has an abnormal opening. This opening allows blood to escape the circulation, and may cause a bruise or hematoma.