Once in my OR, one of my favorite surgeons told his medical student this: "We use this particular machine instead of the one Dr. XYZ uses because this is the one Ann likes. This is her OR & you would do well to remember that." The OR nurses knew their surgeons routines, preferences, how to drape a patient for surgery, and how to dress their patient's surgical incisions. The smart residents & interns would always defer to the OR nurse's knowledge of their attending. :)