Male Pelvic Viscera


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Male Pelvic Viscera

  1. 1. Lecturer: Dante Roel Fernandez RT, M.D.
  2. 2. A firm mobile organ lying within the scrotum, with  the left usually lying at a lower level than the right. Surrounded by a tough fibrous capsule, the tunica  albuginea. From the inner surface of the capsule is a series of  fibrous septa that divides the interior of the organ into lobules. Lying within each lobule are one to three coiled  seminiferous tubules. The tubules open into a network of channels called the rete testis. Small efferent ductules connect the rete testis to the upper end of the epididymis. Normal
  3. 3. A firm structure lying posterior to the testis, with  the vas deferens lying on its medial side. It has an expanded pper end, the head, a body, and a pointed tail inferiorly laterally. The epididymis is much-coiled tube nearly 20 feet  (6cm) long, embedded in connective tissue. A tube called the vas deferens emerges from the tail  of the epididymis and enters the spermatic cord. The long length of the duct of the epididymis  provides storage space for the spermatozoa and allows them to mature. One of the main functions of the epididymis is the 
  4. 4. Blood supply of the testis and epididymis  Supplied by a branch of the abdominal aorta,  the testicular artery. The testicular veins emerge from the testis  and the epididymis as a venous network, the pampinifrom plexus. This becomes a single vein as it ascends through the inguinal canal. The right testicular vein drains into the inferior vena cava, while the left drains in the left renal vein. Lymphatic drainage of the testis and  epididymis The lymph vessels ascend in the spermatic 
  5. 5. A thick-walled tube about 18 inches (45cm) long  that conveys mature sperm from the epididymis to the ejaculatory duct and urethra. Arises from the lower end or tail of the  epididymis and passes through the inguinal canal. Emerges from the deep inguinal ring and passes  around the lateral margin of the inferior epigastric artery. It then passes downward and backward on the lateral wall of the pelvis and crosses the ureter in the region of the ischial spine. The vas deferens then runs medially and  downward on the posterior surface of the bladder.
  6. 6. The seminal vesicle are two lobulated organs  about 2 inches (5cm) long, lying on the posterior surface of the bladder. Their upper ends are widely separated, and their  lower ends are close together. On the medial side of each vesicle lies the  terminal part of the vas deferens. Posteriorly, the seminal vesicle are related to the  rectum. Inferiorly, each seminal vesicle narrows and joins  the vas deferens of the same side to form the ejaculatory duct. Each seminal vesicle consists of much-coiled  tube embedded in connective tissue. The
  7. 7. There are two  ejaculatory ducts; each formed by union of the vas deferens and the duct of the seminal vesicle. The ducts pierces the  posterior surface of the prostate and open into the prostatic part of the urethra, close to the margins of the prostatic utricle. Function is to drain
  8. 8. A fibro muscular glandular organ shaped like an  inverted cone that surrounds the prostatic urethra. It is about 1 ¼ inches (3cm) long and lies between  the neck of the bladder above and the urogenital diaphragm below. A fibrous capsule surrounds the prostate.  Outside the capsule is a fibrous sheath, which is  part of the visceral layer of pelvic fascia. The prostate has a base, which superiorly lies  against the bladder neck, and an apex, which lies inferiorly against the urogenital diaphragm. The two ejaculatory ducts pierce the upper part of  the posterior surface of the prostate, to open into
  9. 9. The prostate is incompletely divided into five  lobes: Anterior lobe- lies in front of the urethra and is  devoid of glandular tissue. Median, middle lobe- is the wedge-shaped and  situated between the urethra and the ejaculatory ducts. Its upper surface is related to the trigone of the baldder; it is rich in glands. Posterior lobe- is situated behind the urethra and  below the ejaculatory ducts and also contains glandular tissue. Right and left lateral lobes- lie on either side of  the urethra and are separated from one another by a shallow vertical groove on the posterior surface of the prostate. The lateral lobes contain many glands.
  10. 10. Relations:  Superiorly- the base of the prostate is  continuous with the neck of the bladder, the smooth muscle passing without interruption from one organ to the other. The urethra enters the center of the base of the prostate. Inferiorly- the apex of the prostate lies on the  upper surface of the urogenital diaphragm. The urethra leaves the prostate just above the apex on the anterior surface. Anteriorly- the anterior surface of the prostate  is related to the symphysis pubis, separated
  11. 11. The fibrous sheath of the prostate is connected  to the posterior aspect of the pubic bones by the puboprostatic ligaments. These ligaments lay one on either side of the  midline and are condensations of pelvic fascia. Posteriorly- the posterior surface of the prostate  is closely related to the anterior surface of the rectal ampulla and is separated from it by the rectovesical septum (fascia of Denonvillier). Blood supply: the arterial supply to the prostate  is from branches of the inferior vesical and middle rectal arteries. The veins is from the prostatic venous plexus the prostatic plexus
  12. 12. Lymphatic drainage- lymph vessels from the  prostate drain into the internal iliac nodes. Nerve supply- nerve supply to the prostate is  from the inferior hypogastric plexuses. The sympathetic nerves stimulate the smooth muscle of the prostate during ejaculation. Prostatic urethra-  Is about 1 ½ inches (3cm) long and begins at  the neck of the bladder. It passes through the prostate from the base  to the apex, where it becomes continuous with the membranous part of the urethra.
  13. 13. On the posterior wall  is a longitudinal ridge called urethral crest. On each side of this  ridge is a groove the prostatic sinus, prostatic glands open into this sinus. On the summit of the  urethral crest is a depression, prostatic