ANATOMY
PELVIS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
70
|
|
|
65
|
|
|
80
|
|
|
90
|
Detailed explanation-1: -The puborectalis muscle forms a loop around the posterior aspect of the external sphincter. Contraction of the puborectalis muscle creates an anorectal angle. This angle and the puborectalis muscle assist in preventing defecation. Defecation is initiated in response to rectal filling.
Detailed explanation-2: -The 80 degree anorectal flexure is an important mechanism for fecal continence. The angle controlled by the puborectalis muscle.
Detailed explanation-3: -The anal canal forms an angle (Anorectal flexure; Perineal flexure) with the lower part of the rectum (Anorectal junction), and measures from 2.5 to 4 cm.
Detailed explanation-4: -The anorectal angle (ARA) is believed to provide one of the most important contributions to anal continence. The normal resting angle is approx. 90 degrees, but the erect position may modify the ARA and other parameters usually considered in a proctometrogram.