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Ejaculation The mechanism of ejaculation is conveniently divided into two phases, emission and expulsion. Emission: During the emission phase, semen (e.g., sperm and seminal fluids) is deposited into the posterior urethra through contractions of the smooth muscles of the vasa deferentia, seminal vesicles, and prostate. At the same time, the internal sphincter of the urinary bladder is closed, thereby preventing retrograde passage of the semen into the bladder. The closure of the sphincter also prevents urine from mixing with the semen. Emission and bladder neck closure are mediated through the thoracolumbar sympathetic system. It is suggested that the sensation of ejaculatory inevitability parallels the emission phase. Expulsion (or true ejaculation): Emission is immediately followed by expulsion. During expulsion, the semen is forcefully propelled along the urethra and out of the penis by clonic contractions of the striated bulbar 218 Waldinger muscles of the urethra and contractions of the striated muscles of the pelvic floor (mainly bulbospongiosus muscles). Expulsion is mediated by the somatic nervous system. Orgasm is associated in timing with the expulsive phase. Orgasm There is limited knowledge about the physiological mechanisms and neurobiology underlying the sensation of orgasm. Orgasm is a complex response involving the whole body. During orgasm, there are changes in the genitalia, in skeletal muscle tone (characteristic spastic contractions of the feet), contractions of facial musculature, vocal reactions (moaning or sighing), semivoluntary movements, general cardiovascular (elevated systolic and diastolic blood pressure) and respiratory changes, somatic sensory experiences, and an altered consciousness. The intense feelings of pleasure and desire accompanying orgasm are mediated by the brain.
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About The Author David Crawford is the CEO and owner of a Male Enhancement Pills company known as Male Enhancement Group which is dedicated to researching and comparing male enhancement products in order to determine which male enhancement product is safer and more effective than other products on the market. Copyright 2010 David Crawford of Male Enhancement Pills This article may be freely distributed if this resource box stays attached.
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