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==Introduction==

==Introduction==

* The bladder is where urine is stored before being expelled by the body through the [[Process of Micturition - Anatomy & Physiology| micturition reflex]].

* The bladder is where urine is stored before being expelled by the body through the [[Micturition - Anatomy & Physiology| micturition reflex]].

* Without a bladder urinary continence would be impossible.

* Without a bladder urinary continence would be impossible.

==Muscles of the Bladder==

==Muscles of the Bladder==

[[Image:sumlutshcemtri.jpg|right|thumb|275px|<small><center>A schematic overview of the lower urinary tract showing the innervation and muscles of the bladder</center></small>]]

[[Image:sumlutshcemtri.jpg|right|thumb|275px|<small><center>A schematic overview of the lower urinary tract showing the innervation and muscles of the bladder</center></small>]]

The three muscular components of the bladder described below play a pivotal part in the [[Process of Micturition - Anatomy & Physiology| micturition reflex.]]  

The three muscular components of the bladder described below play a pivotal part in the [[Micturition - Anatomy & Physiology| micturition reflex.]]  

====Detrusor Muscle====

====Detrusor Muscle====

Some people now think that rather than an internal sphincter which contracts to resist urine outflow there is an actual structure which is opened when its muscle bundles contract.  This would mean in these species that urinary continence relies on the external sphincter.  It is not certain as yet which structure is correct but this idea does concur with the recent demonstration that the proximal urethra plays a role in urine storage in the dog and goat.

Some people now think that rather than an internal sphincter which contracts to resist urine outflow there is an actual structure which is opened when its muscle bundles contract.  This would mean in these species that urinary continence relies on the external sphincter.  It is not certain as yet which structure is correct but this idea does concur with the recent demonstration that the proximal urethra plays a role in urine storage in the dog and goat.

==Revision==

 

|flashcards = [[Bladder Anatomy & Physiology Flashcards|Bladder Anatomy Flashcards]]  

Use the [[Bladder - Anatomy & Physiology - Renal Flash Cards - Anatomy & Physiology|flash card revision resource]] for this section to test yourself.

[[Category:Urinary System]]

[[Category:Lower Urinary Tract - Anatomy & Physiology]][[Category:Bullet Points]]