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Physiology

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Kidney

Question
2 out of 26
 

Ureteric peristalsis is due to (AIIMS NOV 2007)



A Sympathetic innervation

B Parasympathetic innervation

C Both (A) and (B)

D Pace maker activity of the smooth muscle cells in the renal pelvis

Ans. D Pace maker activity of the smooth muscle cells in the renal pelvis

I. Explanation: The walls of the ureter contains smooth muscle and are innervated by both sympathetic and parasympathetic

II. And parasymph nerves as well as by intramural plexus of neurons and nerve fibres that extends along to entire length of the ureters.

III. As with other visceral smooth muscle peristaltic contractions in the ureter are enhanced by parasympathetic nerves stimulation and inhibited by sympathetic stimulation.

IV. The ureteral musculature behaves as a functional syncytium which permits the spread of electrical excitation from cell to cell.

V. The origin of this impulse is from the Pacemaker cells present near the renal pelvis. So, we can say that ureteral peristalsis is an essentially myogenic phenomenon, the influence of the autonomic nerve supply being limited to modulating peristalsis and influencing ureteral tonus.

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