A foramen (plural foramina) is the medical term meaning an opening in the bone through which vessels, nerves, and ligaments pass.
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Foramen
sphenoid
A rounded opeing through a bone is called a foramen.
Meatus-A body opening or passage, such as the opening of the ear or the urethral canal. *American Heritage Dictionary
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
gruondwater
foramen magnum
The large hole in the occipital bone is called the foramen magnum and is the place where your spinal column comes up to meet your brain.
An orifice is a natural opening.
Occipital bone: The bone that forms the rear and the rear bottom of the skull. The occipital bone encloses a large oval hole called the foramen magnum that allows passage of the spinal cord.
FORAMEN - Opening or passage in bones where blood vessels and nerves enter and leave. The foramen magnum is the opening of the occipital bone through which the spinal cord passes.
The sciatic nerves exit the pelvic bone through an opening (greater sciatic foramen) to emerge in the buttock.
the temporal bone