Anatomy of Urethra

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VeritableHafnium
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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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