A 65-Year-Old Man Presented to the Office Complaining of Chronic

A 65-year-old man presented to the office complaining of chronic constipation. The patient has bowel movement that occurs every 4 days, the stool is hard. The patient has difficulty defecation, with incomplete evacuation. The patient uses his fingers to induce defecation. Medical history is significant for multiple sclerosis, for which he takes interferon therapy. Vital signs are unremarkable. On examination, the patient has a distended, non-tender abdomen. This patient's presentation is due to inadequate relaxation of which of the following muscles?

A) Bulbospongiosus
B) Obturator
C) Piriformis
D) Puborectalis
E) Rectus abdominis

Correct Answer:

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