Which medical procedure involves making an incision in the eardrum?

Myringotomy is the correct procedure associated with making an incision in the eardrum. This surgical intervention is commonly performed to relieve pressure caused by fluid buildup in the middle ear, or to insert ear tubes for draining fluid. By creating a small opening in the tympanic membrane, the procedure allows for better aeration and the possibility of fluid drainage, which can help alleviate pain and prevent infections.

Other procedures listed, like adrenalectomy, pertain to the removal of the adrenal glands, herniorrhaphy refers to the repair of a hernia, and phlebotomy is the process of drawing blood from a vein. None of these procedures involve the eardrum or its functions, highlighting why myringotomy is specifically the relevant choice for this question.