Male Anatomy

Penis-1

Penis-2

Penis

Foreskin, glands, shaft

Male circumcision

3 cylinders 2 larger cavernous bodies 1 smaller spongy body Forms head of the penis

Penis- spongy body

Penis dissection

Penis, prostate dissection

Penis curvature

Scrotum Varies with temperature Varies with temperature

Testes Asymmetrical Asymmetrical Left usually lower Left usually lower Heat reduces sperm production Heat reduces sperm production Best at 93 degrees Best at 93 degrees

Seminiferous tubules (Within testes) Site of sperm production Site of sperm production Interstitial (Leydig’s) cells produce androgens Interstitial (Leydig’s) cells produce androgens

Seminiferous tubules

Epididymis Storage of sperm Storage of sperm

Cremasteric reflex Cremasteric muscle Cremasteric muscle

Cryptorchidism Undescended testis Undescended testis Prevents sperm production - too warm Prevents sperm production - too warm

Vas Deferens Moves sperm from scrotum to ejaculatory duct Moves sperm from scrotum to ejaculatory duct Within prostate gland Within prostate gland

Seminal vesicle At end of each vas deferens At end of each vas deferens Alkaline fluid Alkaline fluid

Seminal fluid (semen) 70% = Seminal vesicles 70% = Seminal vesicles 30% = Prostate gland 30% = Prostate gland 1% = Sperm 1% = Sperm 1 teaspoon 1 teaspoon million sperm per ejaculation million sperm per ejaculation

Cowpers (bulbourethral) glands Distilate of love Distilate of love Contains active, healthy sperm Contains active, healthy sperm

Course of sperm Testes Testes Epididymis Epididymis Vas Deferens Vas Deferens Urethra Urethra

Erection Process of tumescence Process of tumescence Morning erections Morning erections Related to Related to REM sleep REM sleep Rapid eye movement Rapid eye movement 90 minute cycle 90 minute cycle Dreaming about lover Dreaming about lover Lover kissing while asleep Lover kissing while asleep Not related to a full bladder Not related to a full bladder

Ejaculation Dry orgasm Dry orgasm Before puberty Before puberty 2 phases 2 phases Emission Emission Fluid in ejaculatory duct Fluid in ejaculatory duct Expulsion Expulsion Semen expelled Semen expelled

Retrograde ejaculation Semen expelled into bladder Semen expelled into bladder May result from May result from Prostate surgery Prostate surgery Certain drugs Certain drugs Congenital abnormality Congenital abnormality

Male cancers Testicular cancer Testicular cancer One of the most common cancers among young men age group One of the most common cancers among young men age group Survival rate very high if detected early Survival rate very high if detected early Genital self-exam recommended Genital self-exam recommended To identify early symptoms To identify early symptoms Lumps on testes Lumps on testes

Prostate cancer Second leading cause of cancer deaths among men Second leading cause of cancer deaths among men Detected by Detected by Digital rectal exam Digital rectal exam Blood test (PSA test) Blood test (PSA test) Ultrasound Ultrasound

Male sexual concerns Penis size Penis size Not related to sexual satisfaction Not related to sexual satisfaction Possibly diameter rather than length Possibly diameter rather than length Small flaccid penis usually increases more during erection than larger flaccid penis Small flaccid penis usually increases more during erection than larger flaccid penis Text does not give size information Text does not give size information

Penis size

Penis size concern

Circumcision Cervical cancer - higher in women having sex with uncircumcised men Cervical cancer - higher in women having sex with uncircumcised men Vaginal infections - May increase in women who have sex with uncircumcised men due to bacteria under the foreskin Vaginal infections - May increase in women who have sex with uncircumcised men due to bacteria under the foreskin Uncircumcised men - more likely to become infected with HIV through heterosexual intercourse than circumcised men. Uncircumcised men - more likely to become infected with HIV through heterosexual intercourse than circumcised men.

Male Kagel exercises Male Kagel exercises Locate PC. Muscle by stopping flow of urine Locate PC. Muscle by stopping flow of urine Better ejaculatory control Better ejaculatory control Similar to female Kagel exercises Similar to female Kagel exercises