10 Questions
What type of muscle is the external anal sphincter?
Voluntary
To what does the external anal sphincter attach anteriorly?
Perineal Body
Which nerve mainly supplies the external anal sphincter?
Fourth Sacral Nerve (S4)
Where is the pecten situated in relation to the anal canal?
Between the Hilton’s line and the pectinate line
What controls the contraction and tonus of the internal anal sphincter?
Parasympathetic fibers from the Superior Rectal Plexus
Which part of the external anal sphincter is often indistinct due to zones rather than muscle bellies?
Deep External Anal Sphincter
What causes temporary relaxation of the internal anal sphincter?
Rectal distension by feces or gas
How is the internal anal sphincter inhibited?
By parasympathetic fiber stimulation
What relaxes temporarily in response to distension of the rectal ampulla by feces or gas?
Internal Anal Sphincter
Which nerve supplies the superior 2/3 of the anal canal?
Superior Rectal Nerve
Learn about the structure and function of the ileocecal valve, its comparison with the pyloric sphincter, and the importance of the ascending colon as a starting point of the colon. This quiz will test your knowledge of these anatomical landmarks.
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