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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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