Male Male AnatomyAnatomy

© Robert J. Atkins, Ph.D.

PenisPenis

How do people alter their How do people alter their genitals?genitals?

PiercingsPiercings TattoosTattoos CircumcisionCircumcision Surgical penile enlargementSurgical penile enlargement

PiercingPiercingPrince Albert

PiercingPiercing

Ladder

TattoosTattoos

CircumcisionCircumcision

Egyptian

Why is cleaning foreskin Why is cleaning foreskin helpful?helpful?

Pull back foreskinPull back foreskin Remove smegmaRemove smegma Avoids smegma build-upAvoids smegma build-up

How is the penis How is the penis constructed?constructed?

What are the three What are the three cylinders? cylinders?

2 larger cavernous 2 larger cavernous bodiesbodies

1 smaller spongy body1 smaller spongy body Forms head of the Forms head of the

penispenis

Penis- spongy bodyPenis- spongy body

Penis dissectionPenis dissection

What is the most What is the most sensitive parts of the sensitive parts of the

penis?penis?

Coronal ridge

Frenulum

Penis, prostate Penis, prostate dissectiondissection

Do you remember?Do you remember?

Why is cleaning an uncircumcised Why is cleaning an uncircumcised foreskin helpful?foreskin helpful?

How is the penis constructed?How is the penis constructed? What are the three cylinders?What are the three cylinders? What are the most sensitive parts of What are the most sensitive parts of

the penis?the penis?

What about penis size?What about penis size? Not related to Not related to

sexual satisfactionsexual satisfaction Possibly diameter Possibly diameter

rather than lengthrather than length Small flaccid penis Small flaccid penis

usually increases usually increases more during more during erection than larger erection than larger flaccid penisflaccid penis

What is the average What is the average penis size?penis size?

5 ½ - 6 “

How does the penis How does the penis compare to the vagina in compare to the vagina in

size?size?

Penis enlargementPenis enlargement

Penis enlargementPenis enlargement

Penis Penis conescones

How much does penis How much does penis size vary?size vary?

Penis size Penis size variations(larger)variations(larger)

Penis size variations Penis size variations (smaller – Micro-penis)(smaller – Micro-penis)

What is penis What is penis augmentation surgery?augmentation surgery?

Done by Done by cutting the cutting the ligaments that ligaments that attach the root attach the root to the pubic to the pubic bone.bone.

Not Not recommendedrecommended

Penis enlargement Penis enlargement resultsresults

Before After

What causes the scrotum to What causes the scrotum to move closer to the body?move closer to the body?

Sexual arousalSexual arousal Cold Cold

temperaturestemperatures FearFear Stroking inner Stroking inner

thighsthighs Cremasteric Cremasteric

reflexreflex Cremasteric Cremasteric

musclemuscle

What about the testes?What about the testes?

AsymmetricalAsymmetrical Left usually lowerLeft usually lower

Heat reduces sperm productionHeat reduces sperm production Best at 93 degreesBest at 93 degrees

Do you remember?Do you remember?

Does a small flaccid penis, and a large Does a small flaccid penis, and a large flaccid penis enlarge equally during flaccid penis enlarge equally during erection?erection?

What is done in penis enlargement What is done in penis enlargement surgery?surgery?

What causes the scrotum to move What causes the scrotum to move closer to the body?closer to the body?

What can you tell me about the What can you tell me about the testes?testes?

What is cryptorchidism?What is cryptorchidism?

Undescended testisUndescended testis Prevents sperm production - too Prevents sperm production - too

warmwarm

What are the What are the Seminiferous tubules?Seminiferous tubules?

Site of sperm Site of sperm productionproduction

Interstitial Interstitial (Leydig(Leydig’’s) cells s) cells produce androgensproduce androgens

Sperm = 1% of Sperm = 1% of semensemen

Seminiferous tubulesSeminiferous tubules

What does the What does the epididymis do?epididymis do?

Storage of spermStorage of sperm

What do the Vas What do the Vas Deferens do?Deferens do?

Moves sperm from scrotum to Moves sperm from scrotum to ejaculatory ductejaculatory duct Within prostate glandWithin prostate gland

Do you remember?Do you remember?

What is cryptorchidism?What is cryptorchidism? What are the seminiferous tubules?What are the seminiferous tubules? What does the epididymis do?What does the epididymis do? What do the vas deferens do?What do the vas deferens do?

What are the seminal What are the seminal vesicles?vesicles?

At end of each vas At end of each vas deferensdeferens

Alkaline fluidAlkaline fluid Major portioin of Major portioin of

seminal fluidseminal fluid

What is the difference What is the difference between sperm and between sperm and

semen?semen? Semen (What comes Semen (What comes

out)out) 70% = Seminal 70% = Seminal

vesiclesvesicles 30% = Prostate gland30% = Prostate gland 1% = Sperm1% = Sperm

1 teaspoon 1 teaspoon 200-500 million sperm 200-500 million sperm

per ejaculationper ejaculation

Sperm

Prostate glandProstate gland

Some semen contribution

Cowpers (bulbourethral) Cowpers (bulbourethral) glandsglands

Distilate of loveDistilate of love May contain active, May contain active,

healthy spermhealthy sperm Can produce Can produce

pregnancy without pregnancy without ejaculationejaculation

What is the course of What is the course of sperm?sperm?

TestesTestes EpididymisEpididymis Vas DeferensVas Deferens Seminal vesiclesSeminal vesicles UrethraUrethra

What causes erections?What causes erections?

Process of Process of tumescencetumescence

Nighttime Nighttime erectionserections Related toRelated to

REM sleepREM sleep Rapid eye movementRapid eye movement 90 minute cycle90 minute cycle

Not related to a full Not related to a full bladderbladder

Do you remember?Do you remember?

What do the seminal vesicles do?What do the seminal vesicles do? What is the difference between What is the difference between

sperm and semen?sperm and semen? What may the cowpers gland What may the cowpers gland

contain?contain? What is the course of the sperm?What is the course of the sperm? What causes nighttime erections?What causes nighttime erections?

What are the stages of What are the stages of ejaculation?ejaculation?

2 phases2 phases EmissionEmission

Fluid in ejaculatory Fluid in ejaculatory ductduct

ExpulsionExpulsion Semen expelledSemen expelled

Dry orgasmDry orgasm Before pubertyBefore puberty

What is retrograde What is retrograde ejaculation?ejaculation?

Semen expelled Semen expelled into bladderinto bladder

May result fromMay result from Prostate surgeryProstate surgery Certain drugsCertain drugs Congenital Congenital

abnormalityabnormality

What can you tell me What can you tell me about testicular cancer?about testicular cancer?

One of the most common cancers One of the most common cancers among young men - 15-34 age groupamong young men - 15-34 age group

Survival rate very high if detected Survival rate very high if detected earlyearly

Genital self-exam recommendedGenital self-exam recommended To identify early symptomsTo identify early symptoms

Lumps on testesLumps on testes

Do you remember?Do you remember?

What are the stages of ejaculation?What are the stages of ejaculation? What is retrograde ejaculation?What is retrograde ejaculation? Why is a genital self-exam Why is a genital self-exam

recommended?recommended?

What problems does the What problems does the prostate cause?prostate cause?

Prostate Prostate cancercancer Second Second

leading cause leading cause of cancer of cancer deaths in mendeaths in men

Prostate Prostate enlargementenlargement

How can you detect How can you detect prostate cancer?prostate cancer?

Detected byDetected by Digital rectal exam Digital rectal exam

(DRE)(DRE) Blood test – Prostate Blood test – Prostate

Specific Antigen test Specific Antigen test (PSA test)(PSA test)

UltrasoundUltrasound

Digital exam

Do you remember?Do you remember?

What problems do the prostate What problems do the prostate cause?cause?

How can you detect prostate cancer?How can you detect prostate cancer?