URETHRA

 Urethra

Preprostatic	Intramural
Prostatic	widest most dilatable spindle shaped cross section-----horse shoe shaped urethral crest/veru montanum On either side of the crest is a slightly depressed fossa, the prostatic sinus; the floor of which is perforated by numerous apertures, the orifices of the prostatic ducts from the lateral lobes of the prostate; At the forepart of the urethral crest, below its summit, is a median elevation, the colliculus seminalis
Membranous	pases through external urethral sphincter narrowest part (except external orifice) surrounded by fibres of sphincter uethrae shortest least dilatable ducts of bulbo-urethral glands enter here
Spongy (penile + bulbar)	Longest in corpus spongiosum ducts from urethral/littrre’s glands 2 parts                             1.        bulbous                             2.       pendulous
external urethral orifice	5mm

Type of epithelium lining

Preprostatic	transitional epithelium
Prostatic	transitional epithelium
Membranous	pseudo stratified columnar
Spongy (penile + bulbar)	proximally---pseudostratified columnar distally ----stratified squamous
external urethral orifice	----------------------------------------------

LYMPHATIC DRAINAGE of URETHRA

Posterior urethra §      Proximal 2/3rd  of female urethra §      Prostatic  & membranous parts of male urethra	·         External iliac     ·           Obturator(along internal pudendal a.)     ·         Internal iliac(Hypogastric)     ·         Presacral
Anterior urethra §        Distal 1/3rd of female urethra   §       Bulbous & penile /spongy/distal urethra in males	superficial inguinal LN à deep inguinal LN à external iliac LNàLateral aortic

Whole of female urethra drains mainly into------------- internal iliac nodes