The distribution of glycine receptors in the human brain provides an anatomical substrate for the understanding of the effects of drugs acting in these receptors, particularly strychnine. The distribution of glycine receptors in the human brain is comparable to that seen in the rat brain, although densities are much higher in the rat. A peculiar spotty distribution of strychnine binding sites were found in the gracilis and cuneatus nuclei. Some hymens have small perforations or multiple openings. If the hymen isnвЂ™t fully covering the vaginal opening, it may look like a crescent or half-moon. Having penis-in-vagina sex can also stretch your hymen. As time goes by, normal, everyday activities can cause your hymen to stretch and open up like riding a bike, doing sports, or putting something in your vagina (like a tampon or finger). The highest densities of grains were associated with the substantia gelatinosa of the trigeminal nucleus in the medulla oblongata. If the hymen is intact, it may look like a thin disc covering the opening of the vagina or a doughnut-shaped ring around the vagina (hymenal ring). Some people have hymens that cover most of their vaginal opening, and others barely have a hymen at all. In pons, medulla oblongata and upper cervical cord high densities of strychnine binding sites were associated with some nuclei including the motor and sensory trigeminal nuclei, the facial and the hypoglossal nuclei. Low densities were seen in the midbrain except for dorsal and lateral parts of the periaqueductal grey matter and the oculomotor nuclei. No specific binding of strychnine was observed in any of the forebrain areas studied. But it can cause a few problems, such as: Bladder control problems ( urinary incontinence) A kink in the urethra, the tube that carries your urine.

Receptor densities were quantified by computer assisted microdensitometry. Pelvic organ prolapse is rarely life threatening. Slide mounted tissue sections were labeled in vitro by incubation with strychnine and autoradiograms obtained using Ultrofilm. Glycine receptors were localized autoradiographically in postmortem human brain material using strychnine as a ligand.

Residual hymen tissue hanging out