Outline Male sex anatomy Physiology lecture W09

Outline Male sex anatomy Physiology lecture W09 - Male...

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Male Reproductive Anatomy and Physiology and Reproductive Health Issues for Both Men and Women
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Penis –External Structures Root –extension internally into pelvic cavity and includes attachment to pelvic bones Shaft – external pendulous portion of penis minus glans Glans – smooth acorn shaped head of external part of penis Greatest concentration of nerve endings Two most sensitive regions of glans: Rim or crown Frenulum –thin strip of skin that connects glans to shaft on underside of penis
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Penis –External Structures Foreskin –or Prepuce is skin covering penile glans. Covers glans fully or partially Foreskin can be retracted easily Circumcision is the surgical removal of the foreskin Most common genital alteration Very old practice – 6000 BC in Egypt Performed for religious, ritual or hygienic reasons Superincision - variation where foreskin is split lengthwise but no removed. Practice in South Pacific as passage ritual to sexual maturity
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Concerns About Sexual Functioning - Circumcision Surgical removal of the foreskin Practiced for religious, ritual or hygienic reasons In US operation performed on most male infants with parental consent on second day after birth Pro circumcision Reflects concern of medical profession about hygiene If area under foreskin not routinely cleaned, can harbor diversity of infection causing organisms that can be passed on to partner Uncircumcised males have higher risk for penile cancer than circumcised ones
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Concerns About Sexual Functioning - Circumcision Cons Functions of foreskin not yet determined Some believe that surgery is unnecessarily traumatic Opens possibility for surgical complications for infant Hemorrhage, infections, mutilation, shock and even death in extremely rare cases American Academy of Pediatrics has a neutral stand Sensitivity issue Foreskin of uncircumcised man is retracted during intercourse so no difference in contact Masters and Johnson 1966 found no evidence of differences in responsiveness
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Male Sexual Anatomy – Internal Structures Penis Nerves Blood vessels Fibrous tissue 3 cylinders of spongy tissue Two cavernous bodies next to each other above smaller spongy body Muscles in base of penis –eject urine and semen
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The penis Two cavernous bodies –engorges with blood during erection One spongy body- cylinder that forms bulb at base continuing up through shaft and forms glans Fig 5.1b Interior structure of the penis: (b) cross section of the penis Male Sexual Anatomy (cont.)
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The scrotum two chambers each with single testis or testicle Out pocket of abdominal wall in groin muscle layer (tunica dartos)- involuntary spermatic cord suspends each testis in sac Contains vas deferens and blood vessels and cremasteric muscle fibers
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Testicle seminiferous tubules Thin, highly coiled structures interstitial cells
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This note was uploaded on 10/19/2009 for the course BIO 30 taught by Professor Kahn during the Spring '09 term at UC Riverside.

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Outline Male sex anatomy Physiology lecture W09 - Male...

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