Images Of Cervix Mucus Cervix - Opening Or Lump?

Cervix - opening or lump? - images of cervix mucus

http://www.aecom.yu.edu/cancer/outreach/ ...

In this system, cervix, vagina is as shown in essence, yes, but above. Here, he looks like a combination between the vaginal canal and uterus.

If the cervix is an opening jump horizontally (shown in the vagina as in the picture) why me feel like a drive, such as cartilage, bone, and the ball almost half of the posterior wall of vagina? Is my cervix? If so, why something else is to be shown in the diagrams? I do not understand whether it is simply an opening, or bulging of the posterior wall of the vagina - are entirely different things!

I hope you understand what I mean, it's hard to explain.

Please help! Thank you! :)