Urogenital Triangle Flashcards
What are the boundaries of the urogenital triangle?
The base is formed by the imaginary line between the ischial tuberosities and the apex is formed by the pubic synthesis
What structure is found in the urogenital triangle that allows the passage of the urethra?
Urogenital diaphragm
What fascia attaches to the posterior border of the urogenital diaphragm?
Scarpa’s
List some functions of the the urogenital diaphragm
- Closes off the space between the pubic bones
- Prevents prolapse
- Provides attachment for structures of the superficial perineal pouch
Which layer of fascia of the urogenital diaphragm blends with the perineal body and membrane?
Superior
Which layer of fascia of the urogenital diaphragm contains the sphincter urethrae that controls urinations and the deep transverse perineal muscles?
Middle
What is the name of the layer of fascia between the perineal membrane and the skin
Superficial perineal patch
Which layer of the urogenital diaphragm is the deep perineal pouch?
The middle layer
In what layer of the urogenital diaphragm is the vagina?
The deep perineal pouch
In what layer of the urogenital diaphragm is the small glands associated with the vagina found?
Superficial perineal pouch
What structures are found in the deep perineal pouch?
- Urethra
- Sphincter urethrae
- Deep transverse perineal muscles
- Internal pudendal vessels and branches
What nerve innervates the deep perineal pouch?
Pudendal nerve
What structures are found only in the female deep perineal pouch?
- Vagina
- Dorsal nerves of clitoris
What structures are found only in the male deep perineal pouch?
- Membranous urethra
- Dorsal nerves of the penis
- Bulbourethral glands
- Penile arteries
Which pouch of the urogenital diaphragm lies between the perineal membrane and the skin?
Superficial perineal pouch
What pouch of the urogenital diaphragm contains both the male and female reproductive organs?
Superifical peroneal pouch
What muscles are found in the superficial perineal pouch?
- Ischiocavernosus
- Bulbospongiosum
- Superficial transverse perineal
What are the muscles of the superficial pouch supplied by?
Perineal branches of the pudendal nerve
What is the man function of the muscles of the superficial perineal pouch?
To overlie the erectile tissue of both sexes and maintain erection of the tissues by contracting to imped venous return, keeping the blood in the erectile tissue
What is the main function of the ischiocavernosus muscle?
To help maintain erection of the penis and clitoris during stimulation
What nerve and artery supply the ischiocavernosus muscle?
Perineal artery ad nerve
What is the main function of the bulbiospongiosum in males and females?
- In males it facilitates urination, ejaculation and erection
- In females it contributes to the erection of the clitoris and emptying the greater vestibular glands
What nerve and artery supply the bulbiospongiosum muscle?
Perineal nerve and artery
What is the function of the superficial transverse perineal muscles?
To support the edge of the urogenital diaphragm
What part of the urogenital diaphragm provides attachment for the small muscles of the superficial perineal pouch?
The perineal body
What structure is the site of attachment for the anal sphincter
The perineal body
What structure is the attachment site for bulbospongiosus and the superficial transverse perineal muscles?
The perineal body
What is the crura?
- In males it is a structure that continues into the penis as the corpora cavernosa
- In females it forms the body of the clitoris
What does the bulb of the penis continues as?
Corpus spongiosum which forms the glands penis
What is the name of the structure in females that surround the opening of the vagina and forms the glands of the clitoris?
Bulb of vestibule
What are the blocks of erectile tissue in the penis?
- Corpus spongiosum
- Corpus cevernosum
What block of erectile tissue in the penis does the urethra lie within?
Corpus spongiosum
What artery and nerve supply the penis?
Pudendal artery and nerve
Where does innervation to the erectile tissue of the penis come from?
Autonomic nerves
What are the 4 parts of the male urethra?
- Pre-prostatic
- Prostatic
- Membranous
- Penile
Where is the pre-prostatic part of the male urethra found?
Between the trigone and the prostate gland
Where is the membranous part of the male urethra found?
Passing between the urogenital diaphragm
Where does the ejaculatory duct join the urethra?
At the prostatic part
What nerve provides sensory innervation innervation to the penis and scrotum?
Pudendal nerve
How does the pudendal nerve reach the structures of the anal and urogenital structures?
Passes through the greater sciatic notch , around the ischial spine and then through the lesser sciatic notch to descend branches
The clitoris is composed of erectile tissue derived from what structures?
The crura and bulb of vestibule
What artery and nerve supply the clitoris?
Pudendal artery and nerve
