Confused and Have Questions

So I was listening to this podcast:

The Truth About Living With A Micropenis

It's about living with a micropenis. But they mentioned several things that really confused me.

1. The typical vagina is only 3-5 inches deep.
Webgoji - Oh BULL, that would mean that even I am running into the cervix and that's not true.
2. The typical vagina relaxes and expands in all directions, even back.
Webgoji - Um ... but there's still that issue of the cervix.
3. The cervix will move out of the way to accommodate a penis.
Webgoji - Okay ... whoa, whoa ... whoa. All of that is connected. The cervix can't just go hang out with the ovaries until it's all done.

So my questions are:

1. Does the vaginal canal actually expand backwards and when it does ..?
2. Does the cervix fold itself over or under or something to allow for this expansion?

The physics just aren't adding up in my head. If anyone understands this, please let me know.

per my ob-gyn ----In General a womans vagina varies per person just like a mans penis size is not the same for everyone....some have shorter some have longer, some are wider and some are slimmer. the general rule is a womans vagina is the length of their middle or forefinger (the first finger next to the thumb)

a womans vagina is elastic meaning it is soft and flexible to accommodate the birth of a child. what that means it is can accommodate various sizes of penises/toys what have you with out running into or damaging the vaginal walls and cervix (the cervix is not a separate organ. its the opening to the Uterus, its like a hallway leading into the uterus)

the cervix does not fold or move. its part of the uterus and the uterus is a muscled organ that can expand and contract (think labor and that time of the month muscle movements, contractions, spasms, and how it gets longer shorter,and fatter when a baby is inside then out of it.) one popular way schools sometimes explain the uterus and cervix is with a balloon...it has the opening and the main area and when needed it gets longer fatter bigger and other times its short and and at its flattest.

to find out sizing directly related to you and your body contact your gynecologist or other doctor that does your internal exams. they will be able to tell you what your measurements are and any other sizing questions you may have...

as for the video one thing to remember about educational videos and pod casts....they speak in terms of general not specific to the listeners own situation. to put it another way...they can give the textbook information but they cant give you specifics to how each person s own body is. for that you need to consult your own treatment providers.