Parts of The Male Urethra – Differences between Prostatic, Membranous and Spongy Urethra

The following table summarizes the different parts of the Male Urethra

FeaturesProstatic partMembranous partSpongy part
LocationWithin prostateWithin urogenital diaphragmWithin penis (corpus spongiosum)
Length3 cm1.5–2 cm15 cm
Shape in cross sectionHorseshoe shapedStar-shapedIn the bulb—trapezoid
In the body—transverse slit
At external urethral orifice—vertical slit
Diameter and
dilatability
Widest and most dilatableNarrowest and least dilatableMostly uniform diameter with medium
dilatation
Openings• Prostatic utricle
• Ejaculatory ducts
• Prostatic glands
Minute mucous glandsUrethral glands (Littre’s glands

Different parts of the male urethra

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