The menstruation opening is part of the vaginal opening, which is located below the urine opening and above the anus opening, i.e. a hole in the middle. The menstrual opening is a small opening that allows menstrual blood to pass through. The opening is part of the hymen. It is usually half-moon shaped to allow menstrual blood to pass through.

And when the hymen is torn, the menstrual opening is not affected, but menstruation continues to descend as usual, and in some cases the shape of the hymen may affect the exit of menstrual blood, and the matter is as follows:

• The fully closed diaphragm, which is the diaphragm that does not contain any openings, and therefore does not allow blood to pass through, and here the woman may need to make an opening through which menstruation passes without affecting the remaining part of the hymen.
• A membrane with a very narrow opening, and it contains an opening that is almost invisible, and blood may or may not pass through it, depending on its width. on the hymen.