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 :
Urinary Incontinence : Loss of control on mixturation is called as urinary
incontinence.
