Micturition lec Flashcards
What are the two phases of micturition
bladder filling, bladder empyting
urinary continence is maintained by
Anatomical support structures (Bladder)
Neuromuscular control mechanisms.
provides manometric, neuromuscular and perceptual information to investigate for voiding dysfunction.
urodynamic testing
reflex is detrusor contraction with sphincter relaxation.
micturition
Coordination of the micturition reflex is controlled by the brain stem (Pontine Micturition Center) via
the long spinal (loop II) pathways to the sacral cord (S2, S3, and S4).
Voluntary controlled by
suprapontine higher functions via loop 1.
cerebral cortex micturition center location, NT & function
Right dorsolateral prefrontal cortex (orbitofrontal) and anterior cingulate gyrus, GABA, provides voluntary control
what part of the PMC is responsible for bladder voiding and bladder storage, and state the nerve stimulation for each
Medial PMC (Barrington’s nucleus): via sacral parasympathetic nerves stimulation, results in BLADDER VOIDING u Lateral PMC: via thoracolumbar sympathetic nerves stimulation, results in BLADDER STORAGE
parasympathetic plexus
inferior hypogastric
parasympathetic receptors
M3 via AcH
Sympathetic plexus
pelvic plexus
sympathetic nerve
hypogastric nerves
sympathetic receptors
B3 on detruser, a1 on bladder neck and tirgone via epi
origin of sympathetic segments
t11-l2
origin of somatic and parasympathetic
s2-s4
