Uretheral and penile diseases

he male urethera:
Anatomy:
The male urethra is about 20 cm. in length and classify into 2 parts by the
urogenital diaphragm these are :
A)Posterior urethera : extend from the internal uretheral meatus to the inferior
layer of the urogenital diaphragm and farther classified into :
1.Prostatic urethera: about 4 cm. in length and surround by the tissue of the
prostate and has transitional urothelium.
2.Membranous urethera: about 1-2 cm. in length ,surrounded by the external
urethral sphincter and also had transitional urothelium.
B)Anterior urethra: extend from the inferior layer of the urogenital diaphragm to
the external uretheral meatus.it is farther classified into:
1.Bulbous urethra: surrounded by the bulbs of the penis and has transitional
urothelium.
2.Penile urethra: surrounded by the erectile corporal tissues and also had
transitional urothelium.
3.Glanular urethra: surrounded by the glans penis and had squamous epithelium.
FEMALE URETHRA
The adult female urethra is about 4 cm long and 8 mm in diameter The epithelial
lining of the female urethra is squamous in its distal portion and pseudostratified
or transitional in the remainder.
Blood supply of the male urethra:
The prostatic and membranous urethra supplied by branches from :
Inf. vesicle A., internal pudendal A. and middle rectal A.
While the penis and anterior urethra are supplied by the internal pudendal
arteries. Each artery divides into
a deep artery of the penis (which supplies the corpora cavernosa),
a dorsal artery of the penis, and the bulbourethral artery. These branches supply
the corpus spongiosum, the glans penis, and the urethra.
PENIS
Gross Appearance
The penis is composed of 2 corpora cavernosa and the corpus spongiosum, which contains
the urethra, whose diameter is 8–9 mm. These corpora are capped distally by theglans.
Each corpus is enclosed in a fascial sheath (tunica albuginea), and all are surrounded by a
thick fibrous envelope known as Buck’s fascia.
A covering of skin, devoid of fat, is loosely applied about these bodies.
The prepuce forms a hood over the glans.
Beneath the skin of the penis (and scrotum) and extending from the base of the glans to the
urogenital diaphragm is Colles’ fascia, which is continuous with Scarpa’s fascia of the lower
abdominal wall .