As the title suggests...also wondering how it is possible for it to move?

The reason behind the question is I recently had my morph scan, and she checked (because I asked) the position of the placenta in relation to my previous cs scar.... She said she couldn't see for sure, but it is fairly close and is also on the anterior wall.

So just quietly I am freaking out about ending up with the placenta on my scar, as she said that due to the uterus stretching, the placenta can move positions...

I nodded because I have heard this before and know I now have to have a 3rd tri scan to see where it ends up.

Then DH asked me how it move, and by extension, how can it move if it is attached to the uterus, so thus, how is it attached? And it occurred to me I really hadn't the foggiest

So please enlighten us wise women!