Session 8: Group Work Flashcards
Which major divisions of the nervous system innervate the urinary bladder?
Parasymp
Symp
Somatic
What could be the functional significance of such multiple neuronal supplies to a visceral organ?
Finer control of micturition
Receptors of the sympathetic nervous system in the bladder.
Beta3 in the detrusor muscles.
Alpha 1 in the IUS.
Receptors of the parasympathetics in the bladder.
M3 of the detrusor muscles.
Which functional anatomical units of the urinary bladder do the sympathetic efferent fibres innervate?
Bladder (detrusor)
IUS
Which functional anatomical units of the urinary bladder are innervated by parasympathetic efferent fibres?
Detrusor muscle
What somatic nerve supplies the urinary bladder, and what spinal cord root vlaues are represented within this nerve?
Supplies the EUS via the pudendal nerve (S2-S4)
What brain centre is responsible for storage of urine?
PMC (Pontine medullary centre)
L-region
What type of neurones in the spinal cord exclusively mediates continence?
Symp
Somatic
Apart from their actions on the urinary bladder, are there any other effector sites that brain continence centres also influence?
EUS and IUS
What are the consequences of these actions?
Conscious retention of urine by contraction of EUS
The continence phase allows storage of urine. As the bladder fills, what happens to the intravesical pressure?
It will initially increase 0-50 ml and then not increase as the bladder relaxes. At around 350 ml there will be a steep increase in pressure again.
What sensory information is conveyed to the brain by afferent fibres of the pelvic nerve?
Stretch in the bladder (how much urine is there)
By what collective name are areas of the nervous system responsible for urinary voiding known as?
M region
Which division of the nervous system when active allows for voiding of the bladder to occur?
Parasympathetic
