Male genetalia

• The external genitalia consist of the penis and the scrotum
• The penis is the male reproductive organ.
• Scrotum

  • This darkly pigmented structure contains sweat and sebaceous

  glands and consists of folds of skin (rugae) and the cremaster

  muscle.
• The shaft of the penis is composed of three cylindrical masses of

  vascular erectile tissue that are bound together by fibrous tissue
• Corpora Cavernosa- either of two masses of erectile tissue

  forming the bulk of the penis two corpora cavernosa on the dorsal

  side
• Corpora Spongiosum- a mass of erectile tissue alongside the

  corpora cavernosa of the penis and terminating in the glans. 2 on

  the ventral side.
• The penis has a role in both reproduction and urination.
• The base of the glans, or corona, is somewhat larger as

  compared with the shaft of the penis.
• If the man has not been circumcised, a hood-like fold

  of skin called the foreskin or prepuce covers the

  glans.
• Scrotum maintains the cooler-than-body temperature

  necessary for production of sperm (less than 37°C).
• The muscle contracts when too cold, raising the scrotum and testes

  upward toward the body for warmth (cremasteric reflex).
• When the temperature is warm, the muscle relaxes, lowering the scrotum and testes away from the heat of the body.
• Spermatic cord – contains blood vessels, lymphatic vessels,

  nerves, and the vas deferens which transport spermatozoa away

  from the testes.
• the spermatic cord on the left side is usually longer, thus the

  left testes hangs lower than the right testes.
• Testes – the function of the testes is to produce spermatozoa and

  the male hormone testosterone.
• Epididymis- is a comma- shaped, coiled tubular structure that

  curves up over the upper and posterior surface of the testes.
• Vas deferens (ductus deferens)- is a firm, muscular tube that is

  continuous with the lower portion of the epididymis. provides the passage for transporting sperm from the testes to the urethra for ejaculation.
• Inguinal area

  – Located between the anterior superior iliac spine

  laterally and symphysis pubis medially

  – Frequent site of hernia development through weak

  areas of the musculature
• The femoral canal is another potential spot for a hernia.
• The anal canal is the final segment of the digestive system.
• The anal opening (or anal verge) can be distinguished from the perianal skin by its hairless, moist appearance. The anal verge extends interiorly, overlying the external anal sphincter.
• The external sphincter is composed of skeletal muscle and is under

  voluntary control.
• The internal sphincter is composed of smooth muscle and is under

  involuntary control by the autonomic nervous system.
• The rectum is lined with folds of mucosa, known as the columns of

  Morgagni. s.
• Prostate Gland -It secretes a thin, milky substance that promotes sperm

  motility and neutralizes female acidic vaginal secretions.
• Prostatic hyperplasia, enlargement of the prostate gland, has

  become increasingly common in men over age 40.