A body orifice is any opening in the body of an animal.
Internal
Internal orifices include the orifices of the outflow tracts of the heart, between the heart valves.
References
Body orifice Wikipedia(Text) CC BY-SA
A body orifice is any opening in the body of an animal.
Internal orifices include the orifices of the outflow tracts of the heart, between the heart valves.