Sex organs of the male

1
Sex organs of the male

• External genitals
• Internal reproductive structures

2
Parental response, 1999
Difference between genders is not significant.
Significantly more parents approved than
disapproved or warned. (c2 (1 d.f.) 18.96, p lt
.01)
3
External genitals

• Scrotum
• Cremasteric muscles
• Dartos muscles
• Testes Hormones and sperm/Testify
• Lobes of seminiferous tubules
• Leydig cells/interstitial cells
• Vas efferens/vasa efferentia Peristalsis
• Epididymis
• Vas deferens Vasectomy

4
Genital self-examination

• Check skin for bumps, sores, and blisters,
  including glans
• Testicular self-examination
• Conduct when cremasteric muscles are relaxed
• Look for pea-sized bump, full or heavy feeling in
  scrotum, swelling or tenderness

5
Testicular conditions

• Varicocele
• Hydrocele
• Spermatocele
• Testicular torsion
• Cryptorchidism
• Testicular cancer
• A young mans disease
• Rare but lethal if not treated promptly

6
Other conditions

• Urethritis
• Benign Prostatic Hyperplasia
• Prostate cancer
• Digital rectal examination
• PSA test
• Phimosis
• Cramping
• Priapism

7
The penis

• Glans
• Corona and frenulum
• Urethra
• Prepuce or foreskin
• Shaft
• Corpora cavernosa
• Corpus spongiosum
• Crus/crura

8
Erection

• Levator ani muscle group a hammock
• Bulbocavernosus/bulbospongiosus
• Ischiocavernosus
• Neural stimulation nitric oxide
• Sexual arousal in brain releases nitric oxide in
  penis
• Activates cyclicGMP

9
Erection, continued

• cGMP causes smooth muscle tissue to relax
• Arteries dilate
• Increased arterial blood inflates the penis
• Rising blood pressure constricts veins
• Arousal--gtNitric oxide release in penis
  --gtactivation of cGMP--gtincreased blood
  flow--gterection

10
What goes wrong?

• Inattention lowers nitric oxide release
• cGMP is quickly metabolized by an enzyme
• cGMP activation must at least equal
  metabolization
• Sildenafil (Viagra) inhibits metabolizing enzyme
• Diabetes, artery blockage, nerve damage
• Appearance and angles

11
Circumcision

• The procedure
• Religious reasons
• Judaism and Islam
• Christianity
• Cultural reasons
• U.S.A. vs Canada, Great Britain
• Health reasons
• Urinary tract infections in infancy
• STD susceptibility

12
Internal reproductive tracts

• Vas deferens/Vasa deferentia
• Ejaculatory duct
• Seminal vesicles
• Urethra
• Prostate Combined muscle and gland
• Semen
• Cowpers/bulbourethral glands

13
Sperm production and ejaculation

• LH/ICSH (Interstitial Cell Stimulating Hormone)
• FSH stimulates spermatocytes, which divide into
  spermatids with 23 chromosomes
• Sperm
• Head
• Midsection
• Tail
• Spinal reflex Ejaculation