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Urethra Anatomy

Anatomy Of Urethra

  • It is a tube through which the urine which is stored in urinay bladder is excreted out.


  • Urethra is the continuation downwards of neck of the bladder.
  • It communicates with urinary bladder through an opening called as internal urethral meatus.
  • It opens to the outside through another opening called as external urethra meatus.
  • The female urethra is short and  straight. It s length is only 4cm.
  • In males the urethra is very long and is divided into 3 parts. Prostatic urethra which is surrounded by prostate gland, membranous urethra and spongy urethra.
  • The male urethra is the common passage for both urine and seminal fluid.

Urinary Bladder Anatomy


Anatomy Of Urinary Bladder

  • It stores the urine.
  • It is present in the pelivic cavity just behind the pubic symphysis.
  •  Distend with urine enlarge upwards and enters the lower part of the abdominal cavity.
  • When empty it is tetrahydron in shape. When it is distended it becomes ovoid in in shape.

Parts :

  • When empty the bladder has apex, base and neck. The neck is continued downwards as urethra. It has 4 borders. Anterior border, Posterior border and two lateral borders.
  • It has 4 surfaces Superior surface, Posterior surface, and 2 intero lateral surfaces.
  • In females behind the base of the bladder, uterus is present.
  • In males, in contact with the base of the bladder a pair of seminal vesicles and vas deferens are present.
  • Within the wall of the urinary bladder, 4 layers are present from inside outward they are mucosa, sub mucosa, muscular layer and serosa.
  • The mucosa of the bladder is drawn into temporary folds which will disappear when the bladder is filled with urine.
  • These folds will not be present in the inner aspect of the base. This area is Slure in shape which is called as internal trigone.
  •  The two supero lateral angles of trigene will have openings of trigene will have openings of ureters.
  •  At the inferior angle of the trigone, there is internal urethral meatus which is the communication between the bladder and urethra.
  • Arterial Supply : Superior and Inferior vesical arteries.
  • Venous Drainage : Vesical flexes of vein.
  • Nerve Supply : Sympathetic and parasympathetic.

Applied Anatomy :


Cystitis : Inflammation of urinary bladder is called as cystitis.
Urinary Incontinence : Loss of control on mixturation is called as urinary incontinence.
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Ureter Anatomy


Anatomy Of Ureter

  • These are a pair of tubes through which the urine formed in the kidney is conveyed through the urinary bladder.
  • The upper part of ureter is dilated called as renal pelvis.
  • It comes out of the hilum of the kidney, narrow and forms the ureter.
  • The ureters pas downwards on both sides of the vertebral column.
  • The end of the pelvic cavity and open into the supero-lateral angles of urinary bladder.
  • The cores of ureter is divided into 2 parts : Abdominal and Pelvic part.
  • The pelvic part is again divided into 3 parts :
  • The ureter shows 3 normal constrictions. - At the pelvic – ureteric Junction.
    - While it is entering the pelvic cavity.
    - While it is passing through the wall of urinary bladder.
  • Arterial supply : Ureteric artery.

Applied Anatomy :

     The renal stones if they are large can get blocked the ureter at any of its 3 normal constrictions. It will cause severe pain called as renal colic. The patient will not be able to pass urine.

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