Lecture 15: Bladder function Flashcards
Name these parts of the urinary bladder
Distal sphincter mechanism is composed of which structures?
- Urethral smooth muscle
- Intrinsic rhabdosphincter
- Peri-urethral musculature
Which muscle undergoes relaxation during the storage phase of micturition?
Detrusor
What is the normal capacity of the urinary bladder?
400-500mL
What are the layers of the detrusor muscle
Longitudinal - Innermost layer
Circular - middle layer
Longitudinal - outermost layer
Name these layers of the urinary bladder
The vasculature of the bladder is primarily derived from the ___ vessels.
The vasculature of the bladder is primarily derived from the internal iliac vessels.
Describe the blood supply to the urinary bladder
Arterial supply is via the superior vesical branch of the internal iliac artery.
In males, this is supplemented by the inferior vesical artery, and in females by the vaginal arteries.
In both sexes, the obturator and inferior gluteal arteries may also contribute small branches.
Describe the venous drainage of the urinary bladder
Vesical venous plexus, which empties into the internal iliac veins.
Describe the parasympathetic innervation of the bladder
P for Pee
Parasympathetic fibres are for peeing.
Parasympathetic fibres are derived from pelvic splanchnic nerves (S2-4)
Motor to detrusor and inhibitory to internal sphincter
Describe the sympathetic innervation of the urinary bladder
S- for storage
Sympathetic fibres are for storaging- bladder filling
Derived from T11-L2
Relaxes detrusor and contracts internal sphincter
The ____ fibres are for peeing?
A) Sympathetic
B) Parasympathetic
B) Parasympathetic
P for Peeing
The ____ fibres are for bladder storage?
A) Sympathetic
B) Parasympathetic
A) Sympathetic
S for Storage
Name the sphincters for the urinary bladder
- Internal urethral sphincter
- External urethral sphincter
What is the epithelium of the urinary bladder
Transitional