NEET PG Medical – 2015 – Question – 68
Anorectal angle is formed due to action of –
a) Internal anal sphincter
b) Circular muscle layer of smooth muscles
c) Longitudinal muscle layer of smooth muscle
d) Puborectalis
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Correct Answer – D
Ans. is ‘D’ i.e., Puborectalis
The anorectal angle (ARA) is the angle between longitudinal axis of rectum (which is represented by posterior rectal line) and longitudinal axis of anal canal.
The normal average value is 95-96″ (physiological range 65-100′).
ARA is an indirect indicator of the Puborectalis muscle activity.
During muscle contraction, ARA becomes more acute, while during relaxing phase it becomes obtuse.
Spoiler
