Bladder Function (Lecture 11)

Question 1

where are the LMN cell bodies located for external urethral sphincter located?

Answer 1

S2,3,4 (Onuf’s nucleus)

Question 2

where are the LMN cell bodies located for bladder detrusor muscle located?

Answer 2

S2,3,4 in intermediate spinal grey matter (parasympathetic)

Question 3

where are 1st order cell bodies for sensation from the bladder

Answer 3

dorsal root ganglia for S2,3,4

Question 4

function of pontine micturition area

Answer 4

allows relaxation of external urethral sphincter

Question 5

function of sensorimotor spincter control area

Answer 5

• brings to consciousness that bladder is full

- inhibits frontal micturition inhibiting center

Question 6

will damage to one side of the brain cause problems with micturition

Answer 6

no

Question 7

damage to bilateral hemispheres causes

Answer 7

no voluntary control over bladder

bladder will empty completely

Question 8

bilateral damage anywhere other than cerebral hemispheres causes

Answer 8

no voluntary control

bladder will not completely empty

Question 9

autonomic dysreflexia

Answer 9

caused by elevated sympathetic activity below lesion and decreased sympathetic activity above lesion
-leads to dangerously high blood pressure

Question 10

what spinal level injury is at risk for autonomic dysreflexia

Answer 10

T6 and above

Question 11

what position should you place a person experiencing autonomic dysreflexia in?

Answer 11

Sit patient up
DO NOT put head down
-find out what the problem is (tight clothes, need to urinate, etc)

Question 12

is detrusor muscle under voluntary or involuntary control?

Answer 12

involuntary

Question 13

function of bladder detrusor muscle

Answer 13

push urine out of bladder

-reflexively activated when bladder is full

Question 14

function of frontal micturition inhibiting area

Answer 14

sends inhibitory axons to pontine micturition center

Question 15

function of pontine micturition center

Answer 15

inhibits external sphincter muscle in response to a full bladder (allows urine to leave bladder)

Question 16

external urethral sphincter under (voluntary/involuntary) control

Answer 16

voluntary (muscle is always active, unless you want to relax it to allow urine to leave bladder)

Question 17

what pathways does the bladder information utilize

Answer 17

dorsal column medial lemniscal
anterolateral pathway
(bilaterally)