Inside-of meaning

He gnawed on the inside of his mouth, studying her for a few moments.

Desire still a hot ember inside of her, she was tempted to set the record straight, but maybe it was best he didn't know how close she had come to giving in.

The inside of her legs were so sore that walking might be more comfortable.

I believe … I hope … that man is still inside of him somewhere.

Now, eyes open, eyes shut—it was both the same—as black as the inside of a buried coffin on a moonless night.