Micturition (urination)

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Last updated 10:36 AM on 5/11/26
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10 Terms

1
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Name the three muscles that control outflow of urine and their NS control

Detrusor - ANS

Int urethral sphincter - ANS

Ext urethral sphincter - Somatic NS

2
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What division of ANS causes detrusor contraction?

Parasympathetic

3
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What division of the ANS causes contraction of int urethral sphincter?

Sympathetic

4
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What is the sympathetic NS overall effect on the bladder?

Allows filling / holds urine!

  • relaxes detrusor to allow filling

  • contracts internal sphincter

5
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What receptors are on detrusor and int sphincter?

Both sympathetic

  • detrusor = b-2 receptors

  • inn sphincter = a-1 receptors

6
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What receptors are on the external sphincter?

Somatic NS so = nicotinic ACH receptors

7
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What is the effect of the para sympatheitc NS on the bladder?

Cintraction of detrusor muscle via Muscarinic ACH receptors.

8
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What nerve carries sympathetic motor to bladder?

Hypogstric nerve

  • arises from L1-L2

9
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What nerve carries parasympathetic motor to the bladder?

pelvic nerve

  • arises from S1-S2

10
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What nerve carries somatic motor to the bladder?

Pudendal nerve

  • S1-S2