A 56-year-old man presented to the clinic due to recurrent rectal bleeding. The patient has been having constipation for the last 6 months. The patient noticed streaks of blood seen covering the stool, but for the last day, the bleeding has been continuous after defecation. Digital rectal examination was unremarkable, but the anoscopy shows swelling with purplish color seen above the dentate line. If this patient undergoes rubber band ligation, which of the following structures would be involved?

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Eductional Objective: Hemorrhoids are caused by chronic straining and constipation. The internal hemorrhoids drain into the superior rectal vein, which will end in the inferior mesenteric vein. Rubber band ligation is used to induce ischemia in the hemorrhoids causing degeneration.

A 56-Year-Old Man Presented to the Clinic Due to Recurrent