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Anatomy Pelvis and Perineum 3 13ef9fae

Internal anal sphincter is a pa of

A
Internal longitudinal fibers of rectum
B
Internal circular muscle fibers of rectum
C
Puborectalis muscle
D
Deep perineal muscles
High-Yield Explanation
Internal anal sphincter is formed by thickened circular muscle coat of the anal canal (which is continuous with rectum) and surrounds the upper two-third of the canal.

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