The Iris
The pigmented portion of the eye with a rounded opening through which light passes is the iris. The iris controls the size of the pupil, which regulates the amount of light entering the eye.
A rounded opening through a bone is called a foramen. Foramen provides a passage for nerves, blood vessels, and other structures to pass through the bone.
Snakes excrete waste through a single opening called the cloaca, which is located at the base of their tail. They eliminate both solid and liquid waste through this opening.
iris
The foramen magnum is the large opening at the inferior portion of the occipital bone that allows the spinal cord to connect with the brain. It acts as a passageway for the brainstem and spinal cord to communicate.
I believe the term you are looking for is a foramen which is an opening in the bone that allows blood vessels to pass through and/or connect to another point
ureteroileostomyPronunciation (u-re-ter-o-il-e-OS-to-me)Medical Terminology = ureter/o + ile/o + stomyDefinition = a new opening between the ureter and the ileum
Hiatal hernia is a condition in which a portion of the stomach protrudes upward into the chest, through an opening in the diaphragm. The diaphragm is the sheet of muscle that separates the chest from the abdomen. It is used in breathing.
A smaller opening.
the anus is the opening through which feces leave the body
peep
pupil