Male Genitourinary Flashcards
Cremasteric muscle
Muscle that controls scrotum contraction and relaxation.
Glans
Tip of the penis
Epididymis
comma-shaped structure that is located on top of the testis. Functions to store, mature, and transition sperm.
Spermatogenesis
- Temp
Spermatogenesis is the creation of sperm cells. Takes place in the testis. Requires a temperature lower than 37 degrees Celsius.
What are the functions of the testis?
Creation of spermatozoa - sperm cells
Creation of testosterone
Vas deferens
Ejaculatory duct, connects with the seminal vesicle, feeds into the urethra.
Prostate gland
- Function
Chestnut shaped gland that surrounds the urethra at the bladder neck. Produces a large amount of ejaculatory fluid that helps liquefy sperm, which comes out coagulated.
At what age do fetuses differentiate with genitalia formation?
Genitalia formation occurs between weeks 8 and 12. Injury or insult to the fetus during this time can result in damage to the forming external genitalia.
What are some risk factors for infertility in males?
- Tight fitting clothing, briefs, hot baths, employment at facilities with elevated temperatures, prolonged sitting - spermatogenesis occurs at temperatures lower than 37 degree C.
- Ignorance of partners ovulation cycle
- History of varicocele, hydrocele, or undescended testes
- Certain medications (steroids, testosterone, marijuana
Dorsal VS ventral
Dorsal is top
Ventral is bottom
Phimosis
Unretractable foreskin seen in uncircumcised males. Can occur early in life as a result of balanitis (inflammation of the glans) as a result of bacterial or fungal infections.
Can occur later in life, especially in patient’s with uncontrolled diabetes.
Priapism
Prolonged, often painful erection. Most cases are idiopathic, but some other cases are caused by conditions such as leukemia or sickle cell disease. Some impotence medications can also result in priapism.
Which testis often hangs lower and why?
The left testis often hangs lower than the right, this is because the left testis has a longer spermatic cord.
Chordee
- Commonly seen alongside?
A congenital abnormality of the penis’s curvature. Most evident on erection.
Commonly associated with hypospadias.
Hypospadias
- Commonly seen alongside?
- Contraindication
Urinary meatus located on the ventral surface of the penis. Congenital abnormality.
Commonly seen alongside chordee.
Contraindication for circumcision.
Peyronie’s Disease
Condition that causes curvature of the penis due to scar tissue formation (plaque). Can cause pain with erections.
Cryptorchidism
Condition where one or both testicles fail to descend into the scrotum before birth. Typically, both testes descend into the scrotum before birth or during the immediate time after delivery.
Can increase risk of infertility if left untreated. Treatment is surgical in nature.
Escutcheon
Triangle patch of hair that develops and thickens during puberty. In males, the triangle is upwards, toward the umbilicus, where pubic hair often grows. Normal finding.
Hydrocele
Development of a fluid filled sac surrounding the testis. Can be seen as swollen testis. Commonly seen during infancy due to incomplete tunica vaginalis formation. Most commonly disappears spontaneously. Painless.
Spermatocele
Benign cystic accumulation of sperm occurring on the epididymis.
Testicular torsion
Twisting of testis around the spermatic cord. Surgical emergency. Extreme pain. Testicles are riding high due to shortened spermatic cord. Scrotal discoloration can be present.
Results in ischemia of the testis.
Varicocele
Abnormal tortuosity and dilation of veins of the pampiniform plexus within spermatic cord. Usually asymptomatic.
Male Tanner stages
Stage 1 - (infant) - small size and shape of the male external genitalia
Stage 2 - (around age 11, onset of puberty) - enlargement of the scrotum and testes. Scrotal sac changes in color and skin texture.
Stage 3 - (around 13) - voice changes, penis size increases, testes drop more.
Stage 4 - (around age 14) - penis continues to enlarge, testes continue to develop
Stage 5 - (adult)
What is examined with retraction of the foreskin?
Observing for phimosis (unretractable foreskin). Phimosis is most commonly seen early in life or in adults with uncontrolled diabetes. Bacterial and fungal infections result in balanitis or inflammation of the glans.