Anatomy of bladder Flashcards
Which body region is the bladder located in?
Pelvis
Where in the pelvis is the bladder located?
Posteriorly to pubic bones
In males, antero-superiorly to prostate gland
In females, anteriorly to vagina
How does the bladder relate to the peritoneum?
Inferiorly to the peritoneum
What is the bladder wall made up of?
Smooth muscle fibres oriented in different directions
called bladder detrusor muscle
What are the parts of the bladder?
Apex
Body
Fundus
Neck
What is the apex of the bladder?
Superior part of bladder that points to the pubic symphysis
What is the body of the bladder?
Middle part of bladder
What is the fundus of the bladder?
Posterior part of bladder
What is the neck of the bladder?
Inferior part of bladder
where fundus and inferolateral surfaces of bladder converge
What shape is the bladder when it’s empty?
Tetrahedral
What are the surfaces of the bladder when it’s empty?
Superior
Posterior
Inferolateral x2
What is the function of the bladder?
Temporary storage of urine
Assist with expulsion of urine
How is the bladder adapted to storing urine?
It is hollow
Its walls are distensible
How is the bladder adapted to expulsing urine?
The musculature of the bladder contracts
The sphincters relax
How does urine enter the bladder?
Via the ureters
Where does urine leave the bladder?
Internal urethral orifice
What part of the bladder contains the openings for the ureters and the internal urethral orifice?
Fundus of bladder
What is the trigone of the bladder?
Triangle formed by the openings for the ureters superiorly, and the internal urethral orifice inferiorly, in the fundus of the bladder
How does the surface of the trigone compare to the rest of the bladder?
Surface of trigone is smooth
rest of surface of bladder is folded
What structures control the release of urine from the bladder?
Internal urethral sphincter
External urethral sphincter
Where is the internal urethral sphincter located?
At the neck of the bladder
proximal part of urethra
What is the internal urethral sphincter made up of?
In males, circular smooth muscle fibres
In females, smooth muscle of bladder neck and proximal urethra themselves
Where is the external urethral sphincter located?
In males, inferiorly to the prostate gland around the membranous urethra
What is the external urethral sphincter made up of?
Skeletal muscle
What happens to the shape of the bladder as it fills with urine?
Becomes more spherical
What happens to the position of the bladder as it fills with urine?
It superior surface ascends
