Probably more than you wanted to know, but necessary to clarify some misunderstandings in regard to Meyer's description of JonBenet's hymen.
"Surrounding the mouth of the vaginal orifice is the rim of tissue called the hymen. The once thick, redundant hymen becomes thin and translucent with varying configurations. The hymen may be annular, crescent-shaped, redundant, and irregular or teardrop-shaped[1] (Fig. 5). Some less common variations of the hymen include the imperforate hymen, microperforate, and the septated hymen. In most instances, correction of these variations is not necessary until the girl reaches puberty."
http://www.medscape.com/viewarticle/468258_print
"Many people are under the impression that the hymen is located within the vagina. It is not. Its part of the vulva, the external genital organs. Its located outside the vagina. The hymen is a layer of tissue, just like the tissue around the opening of your vagina that partially conceals the vaginal orifice. You may or may not have one, most females do. The hymen is named after the Greek God Hymenaeus -- the God of marriage and weddings, FYI.
During the early stages of fetal development there is no opening into the vagina at all. The thin layer of tissue that conceals the vagina at this time usually divides incompletely prior to birth, forming the hymen. The size and shape of this opening (or openings) varies greatly from person to person.
Sometimes this formation of an opening does not occur, resulting in an imperforated hymen (it lacks the more common opening). Some females have no hymen at birth at all, since the tissue divided completely while they were still in the womb."
http://www.coolnurse.com/hymen.htm
Rainsong
"Surrounding the mouth of the vaginal orifice is the rim of tissue called the hymen. The once thick, redundant hymen becomes thin and translucent with varying configurations. The hymen may be annular, crescent-shaped, redundant, and irregular or teardrop-shaped[1] (Fig. 5). Some less common variations of the hymen include the imperforate hymen, microperforate, and the septated hymen. In most instances, correction of these variations is not necessary until the girl reaches puberty."
http://www.medscape.com/viewarticle/468258_print
"Many people are under the impression that the hymen is located within the vagina. It is not. Its part of the vulva, the external genital organs. Its located outside the vagina. The hymen is a layer of tissue, just like the tissue around the opening of your vagina that partially conceals the vaginal orifice. You may or may not have one, most females do. The hymen is named after the Greek God Hymenaeus -- the God of marriage and weddings, FYI.
During the early stages of fetal development there is no opening into the vagina at all. The thin layer of tissue that conceals the vagina at this time usually divides incompletely prior to birth, forming the hymen. The size and shape of this opening (or openings) varies greatly from person to person.
Sometimes this formation of an opening does not occur, resulting in an imperforated hymen (it lacks the more common opening). Some females have no hymen at birth at all, since the tissue divided completely while they were still in the womb."
http://www.coolnurse.com/hymen.htm
Rainsong