HELP PLEASE-Which type of fibers are affected in allowing the external anal sphi
ID: 81609 • Letter: H
Question
HELP PLEASE-Which type of fibers are affected in allowing the external anal sphincter to relax, and is this a voluntary or involuntary response, and so where do these signals come from?
parasympathetic, voluntary, medulla oblongata
somatic motor, voluntary, cerebral cortex
somatic motor, involuntary, spinal cord
parasympathetic, involuntary, spinal cord
parasympathetic, voluntary, medulla oblongata
somatic motor, voluntary, cerebral cortex
somatic motor, involuntary, spinal cord
parasympathetic, involuntary, spinal cord
Explanation / Answer
Answer
The external sphincter muscle a skeletal muscle plays a critical role in maintaing fecal continence. It is controlled by the somatic motor nerves (spinal nerves) from the S2, S3, and S4 levels of the spinal cord. This skeletal muscle or the external anal sphincter relaxation can be voluntarily controlled by cerebral cortex.
Hence, the correct answer is option (b).
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.