The outer ear ends at the eardrum, so I don't think it's topologically significant either. That said, the nostrils and mouth absolutely connect, so you have at least three holes up there.
I think we have five topologically significant holes? Nostrils, mouth, anus, urethra. Nothing else is actually a hole.
How do eye sockets fit into this? Aren't there openings between the skull and outside, technically, even though intraocular muscles or whatever usually keep the eye in an airtight position in the socket?
The outer ear ends at the eardrum, so I don't think it's topologically significant either. That said, the nostrils and mouth absolutely connect, so you have at least three holes up there.
I think we have five topologically significant holes? Nostrils, mouth, anus, urethra. Nothing else is actually a hole.
mouth-anus is one hole. nostrils and mouth form like a Y shape and i don't know enough math to name that kind of system
Sorry, I should've said we have five significant orifices. You're right that mouth-anus is one hole.
How do eye sockets fit into this? Aren't there openings between the skull and outside, technically, even though intraocular muscles or whatever usually keep the eye in an airtight position in the socket?
Well, if we're saying that tissue blocking the way doesn't count, then we have a whooole lot of holes.