UMN vs. LMN Bladder Flashcards
What nerves innervate the urinary bladder?
Pudendal, Pelvic, and HYPOgastric nn.
Which nerve provides somatic innervation to the bladder? What muscle(s) does it control?
Pudendal n.
Urethralis muscle for VOLUNTARY control of micturation
Which nerve provides PSNS innervation to the bladder?
Pelvic n.
Detrussor mm. (smooth muscle of bladder wall)
Which nerve provides SNS innervation to the bladder?
Hypogastric nn. (inhibitory action on detrussor muscles of the bladder wall- B-adrenoreceptors)
As urine fills the bladder, the detrussor mm. stretch. This caused stimulation of what?
GVA (general visceral afferent) neurons
What fibers inhibit contraction of the detrussor muscles?
Sympathetic SNS fibers of LUMBAR spinal segments: essentially promoting storage of urine
What is the stimulus for voluntary contraction of the urethralis muscle?
Urine leakage from bladder into urethra stimulates
AFFERENT fibers–>
Stimulate SACRAL spinal cord segments–>
the voluntary contraction.
How does an animal know it needs to micturate, or pee?
When afferent fibers send a signal to the cortex
What does GVA stand for?
General Visceral Afferent neurons
What does GSE stand for?
General Somatic Efferent neurons
General Somatic Efferent (GSE) neurons are responsible for conscious voluntary motor control of what?
The urethralis muscle and pudendal nerve which allows the animal to choose whether or not to pee.
Is urinary incontinence seen in UMN or LMN bladder?
BOTH
Where would you find a lesion if you have urinary incontinence associated with UMN disease?
The lesion would be cranial to the sacral spinal segments that supply GVA (general visceral afferent neurons) and UMN pathways
Where would you find a lesion if you have urinary incontinence associated with LMN bladder?
The lesion could be in the:
sacral spinal cord segments themselves
sacral spinal, pelvic or pudendal nerves
sacral plexus
UMN or LMN?
Inability to voluntarily micturate
UMN disease
