Exam 3: Micturition and Defecation

Question 1

Describe the sympathetic bladder

Answer 1

Hypogastric nerve
L1-4 (dog), 2-5 (cat)
Ach-nictonic
NE: α: stimulates constriction of internal urethral sphincter, β: stimulates the relaxation of the detrusor muscle to store urine

Question 2

Describe the sympathetic process for defecation

Answer 2

Hypogastric nerve
Stimulates the internal anal sphincter
Inhibits the colon and rectum

Question 3

Describe the parasympathetic bladder

Answer 3

Pelvic nerve
S1-3
Ach- nicotinic
Ach- muscarinic
Stimulates contraction of detrusor muscle

Question 4

Describe the parasympathetic process for defecation

Answer 4

Pelvic nerve

Stimulates colon and rectum

Question 5

Describe the somatic bladder

Answer 5

Pudendal nerve
S1-S3
Ach- nicotinic
Stimulate external urethral sphincter

Question 6

Describe the somatic process for defecation

Answer 6

Pudendal nerve

Stimulates external anal sphincter