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Chapter 5 Male Sexual Anatomy and Physiology. The penis foreskin, glans, shaft, & root. Male Sexual Anatomy. Male Sexual Anatomy (cont.). Fig 5.1a Interior structure of the penis: (a) view from above. The penis corpus carvernosa corpus spongiosum. Male Sexual Anatomy (cont.). - PowerPoint PPT Presentation
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Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Chapter 5
Male Sexual Anatomy and Physiology
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Male Sexual Anatomy
• The penis– foreskin, glans, shaft, & root
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Male Sexual Anatomy (cont.)
Fig 5.1a Interior structure of the penis: (a) view from above.
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• The penis– corpus carvernosa– corpus spongiosum
Fig 5.1b Interior structure of the penis: (b) cross section of the penis
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• The penis; corona, frenulum
Fig 5.2 This figure, a view of the underside of the penis, shows the location of the corona and frenulum—two areas on the penis that harbor a high concentration of sensitive nerve endings.
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• The scrotum– a sac or pouch with two chambers – muscle layer (tunica dartos)
• pulls sac closer to body in cold temperatures– spermatic cord
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Fig 5.3 The scrotum and the testes. The spermatic cord can be located by palpating the scrotal sac above either testicle with thumb and forefinger.
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• The testes – secrete male hormones– produce sperm– cryptorchidism: undescended testis – self-exam is recommended
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Fig 5.4 Underlying structures of the scrotum. This illustration shows portions of the scrotum cut away to reveal the cremasteric muscle, spermatic cord, vas deferens, and a testis within the scrotal sac.
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• The testes– seminiferous tubules
• site of sperm production– interstitial cells
• Major source of androgen– epididymis: sperm maturation
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Fig 5.5a Internal structure of a testis. Sperm are produced in the seminiferous tubules and transported to the epididymis, which serves as a storage chamber.
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• The vas deferens– moves sperm from scrotum to ejaculatory duct
through prostate– ejaculatory ducts open into the urethra
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Fig 5.6 Male sexual anatomy: A cross-section side view of the male reproductive organs.
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• The seminal vesicle– secretes 70% of seminal fluid
• The prostate gland– secretes about 30% of seminal fluid– alkaline fluid helps counteract acidity
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• The Cowper's glands– attaches to urethra just below prostate– secretes fluid before ejaculation– may contain active, healthy sperm
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• Semen (seminal fluid)– about 1 teaspoon– 200 to 500 million sperm
Male Sexual Anatomy (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Male Sexual Functions
• Erection – autonomic nervous system
• arteries expand• blood outflow cannot keep up with inflow
tumescence– psychogenic & physiogenic factors
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Fig 5.7a Male sexual anatomy during ejaculation: (a) the emission phase.
Male Sexual Functions (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• Ejaculation– spinal reflex triggers two phases
• emission: fluid in urethral bulb• expulsion: semen expelled
– retrograde ejaculation– nocturnal emission
Male Sexual Functions (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Fig 5.7b Male sexual anatomy during ejaculation: (b) the expulsion phase.
Male Sexual Functions (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Concerns About Sexual Functioning
• Penis size– symbol of virility– erect penises show less variation than flaccid– size not related to sexual satisfaction– penile augmentation– genital retraction syndrome (koro)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Concerns About Sexual Functioning (cont.)
• Circumcision– hygienic value & risk for STDs?– medical risks– AAP: moderate opposition
• Phimosis: extremely tight foreskin
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Fig 5.9 Circumcision, the surgical removal of the foreskin.
Concerns About Sexual Functioning (cont.)
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Male Genital Health Concerns
• Penis health-care issues– cleanliness: smegma, infections– reaction to vaginal secretions – injuries– penile cancer
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
Male Genital Health Concerns (cont.)
• Testicle health-care issues– testicular cancer
• rare, but more common in young men (15 to 34 years)
• sign: hard or irregular mass• Survival > 90% if detected early
Our Sexuality, 9th Edition, Robert L. CrooksChapter 5: Male Sexual Anatomy and Physiology
• Prostate health-care issues– prostate diseases
• prostatitis: enlarged & inflamed• benign prostatic hyperplasia• prostate cancer
– PSA test– Treatment options for prostate cancer
Male Genital Health Concerns (cont.)