Male reproductive system - urethera, Biology

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URETHRA -

It is common duct as sperms & urine both pass from it.
It receives juices of prostatic gland & cowper's gland.
Urethra is 20 cm long, passes through the penis, it's lumen is star shaped.
It has 3 regions -

(i) A short proximal prostatic urethra surround by prostate gland.

(ii) A very short middle membranous urethra without any covering.

(iii) A long distal penial urethra.

Urethra has 2 sphintors. Internal sphincter is of smooth muscle fibres at its beginning.
External sphinctor is of straited muscle fibres around its membranous part.

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