ANATOMY- The Urethra and Prostate Flashcards
What are the 3 Parts of the MALE URETHRA?
1) PROSTATIC URETHRA
2) MEMBRANEOUS URETHRA
3) SPONGY/ BULBOUS URETHRA
What part of the Male Urethra is the WIDEST?
PROSTATIC URETHRA
What part of the Male Urethra is the NARROWEST?
MEMBRANEOUS URETHRA
Describe the HISTOLOGY of the MALE URETHRA
Prostatic Urethra- TRANSITIONAL EPITHELIUM
Membraneous and Spongy- STRATIFIED COLUMNAR EPITHELIUM
Where does the Prostatic Urethra start and end?
Begins at the Bladder neck
Traverses the Prostate
Ends at the External Urethral sphincter
What is the COLLICULUS SEMINALIS of the Prostatic Urethra?
Elevation of the Urothelium distal to the ejaculatory ducts
COLLICULUS SEMINALIS
What are the 3 constrictions of the Male Urethra?
Internal Urethral Sphincter
External Urethral Sphincter
External Urethral Orifice
MALE URETHRA
What is the Blood supply of the Urethra?
PROSTATIC URETHRA- Inferior Vesical Artery
MEMBRANEOUS URETHRA- Bulbourethral Artery
SPONGY URETHRA- Internal Pudendal Artery
Which part of the Urethra is most likely to be injured in PELVIC FRACTURES ?
Membraneous Urethra
What is the FUNCTION of the Prostate gland?
Secretes Proteolytic enzymes, which allow ejaculate to remain in a fluid state
What is the ARTERIAL BLOOD SUPPLY of the Prostate gland?
Prostatic Artery, Branch of the Internal Iliac Artery
What is the VENOUS BLOOD SUPPLY of the Prostate gland?
Prostatic Venous Plexus–> Internal Iliac Vein
BATSON’S VENOUS PLEXUS: Valveless Plexus connecting the prostate with the Vertebral Bodies
BATSON’S VENOUS PLEXUS
What is the Lymphatic drainage of the Prostate gland?
Internal Iliac Nodes
What is the composition of the prostate?
Consists of tubulo-acinar glands in a fibromuscular stroma
What are Tubulo-acinar glands?
Describes the shape of the gland- Acinar (Rounded), Tubular (Tube)
Where is the capsule of the Prostate found?
Posterior and Lateral aspects of the prostate
What is ABSENT in the anterior aspect of the prostate?
Glands
What are THREE ZONES of the prostate?
- PERIPHERAL ZONE
-TRANSITIONAL ZONE
-CENTRAL ZONE
Which zone forms the MAJORITY of the Prostate gland?
PERIPHERAL ZONE (70%)
What PATHOLOGY is found in the PERIPHERAL ZONE?
Prostate Cancer
Which zone forms the MINORITY of the Prostate Gland?
TRANSITION ZONE (5%)
What PATHOLOGY is found in the TRANSITION ZONE?
Benign Prostatic Hyperplasia (BPH)
What important structures enter the Prostate gland and which zones are they in?
Urethra- Found in the Transition Zone
Ejaculatory Ducts- Found in the Central zone
Zones of the Prostate
What is the Fascia of Denonvilliers?
Layer of fascia which separates the prostate from the rectum.
This is the plane used when excising the rectum and separating it from the prostate
