30 Questions
How long is the male urethra?
18-20 cm
In the flaccid state, how does the long axis of the urethra appear?
S-shaped
Where does the male urethra terminate?
At the external urethral orifice at the tip of the penis
Which part of the male urethra is surrounded by sphincter urethrae?
Membranous part
What shape is the prostatic part of the male urethra on transverse section?
Semilunar
Which structure in the prostatic urethra presents a median longitudinal ridge of mucous membrane?
Urethral crest (verumontanum)
What is the elevation in the middle part of the crest where the slit-like orifice of prostatic utricle is situated?
Colliculus seminalis
Where are the openings of the ejaculatory ducts located?
On each side of the orifice of prostatic utricle
Which part of the male urethra begins as a continuation of the prostatic urethra?
Membranous part
Where are the Bulbourethral glands (of Cowper) placed in relation to the membranous urethra?
One on either side of it
What is the structure that is homologous with the uterus of females?
Prostatic utricle
How many openings do each prostatic sinus present from the prostatic glands?
~20-30 openings
What type of muscle is the internal urethral sphincter made of?
Smooth muscle
Which nerve supplies the external urethral sphincter?
Pudendal nerve
What is the primary function of the internal urethral sphincter?
Preventing release of urine
Which type of epithelium lines the lower part of the prostatic urethra?
Stratified squamous non-keratinised
Where do lymphatics from the spongy part of the urethra pass to?
Deep inguinal, superficial inguinal, and external iliac nodes
From which structures is the lower part of the prostatic and membranous urethra developed?
Definitive urogenital sinus
What is the lining of the upper part of the female urethra?
Transitional epithelium
Where does the female urethra end?
External urethral orifice in the vaginal vestibule
Which male structure is homologous to the paraurethral glands in females?
Prostate
What is the diameter of the female urethra?
6 mm
The penile part of the urethra in males is derived from the:
Urethral plate
What common infection can cause acute urethritis?
Gonococcal infection
What is the longest part of the penile urethra?
Spongy (penile) part
Where does the fixed part of the penile urethra bend downwards?
Behind the pubic symphysis
What is the diameter of the spongy part of the penile urethra in the body of the penis?
6 mm
Where is the external urethral orifice located?
In the glans penis
What forms a sagittal slit about 6 mm long?
External urethral orifice
Where do the ducts of bulbourethral glands open in the penile urethra?
In the membranous part
1404 Renal
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