A helmet for protecting and supporting a head of a patient during surgery, the helmet comprising: a posterior portion including a first body portion, a first lateral rim portion on a first lateral side of the first body portion, a second lateral rim portion on a second lateral side of the first body portion, and an upper rim portion extending between the first lateral rim portion and the second lateral rim portion; a first lateral portion including a second body portion, a first mating rim portion for positioning adjacent the first lateral rim portion of the posterior portion, a second mating rim portion for positioning adjacent an anterior portion of the helmet, and the first lateral portion being hingedly connected to the posterior portion along the first lateral rim portion and the first mating rim portion, and being moveable between an open position and a closed position relative to the posterior portion; a second lateral portion including a third body portion, a third mating rim portion for positioning adjacent the second lateral rim portion of the posterior portion, and a fourth mating rim portion for positioning adjacent the anterior portion, and the second lateral portion being hingedly connected to the posterior portion along the second lateral rim portion and the third mating rim portion, and being moveable between an open position and a closed position relative to the posterior portion; and the anterior portion including a fourth body portion, an opening formed in the fourth body portion, a fifth mating rim portion for positioning adjacent the upper rim portion of the posterior portion, the second mating rim portion of the first lateral portion, and the fourth mating rim portion of the second lateral portion, and the anterior portion being hingedly connected to the posterior portion along the fifth mating rim portion and the upper rim portion, and being moveable between an open position and closed position relative to the posterior portion; wherein the helmet can be assembled around the head of the patient by placing the posterior portion adjacent a posterior portion of the head of the patient, moving the first lateral portion from the open position to the closed position to position the first lateral portion adjacent a first lateral side of the head of the patient, moving the second lateral portion from the open position to the closed position to position the second lateral portion adjacent a second lateral side of the head of the patient, and moving the anterior portion from the open position to the closed position to position the anterior portion adjacent a face of the patient such that a nasal cavity and an oral cavity of the patient are accessible through the opening in the anterior portion. a posterior portion including a first body portion, a first lateral rim portion on a first lateral side of the first body portion, a second lateral rim portion on a second lateral side of the first body portion, and an upper rim portion extending between the first lateral rim portion and the second lateral rim portion; a first lateral portion including a second body portion, a first mating rim portion for positioning adjacent the first lateral rim portion of the posterior portion, a second mating rim portion for positioning adjacent an anterior portion of the helmet, and the first lateral portion being hingedly connected to the posterior portion along the first lateral rim portion and the first mating rim portion, and being moveable between an open position and a closed position relative to the posterior portion; a second lateral portion including a third body portion, a third mating rim portion for positioning adjacent the second lateral rim portion of the posterior portion, and a fourth mating rim portion for positioning adjacent the anterior portion, and the second lateral portion being hingedly connected to the posterior portion along the second lateral rim portion and the third mating rim portion, and being moveable between an open position and a closed position relative to the posterior portion; and the anterior portion including a fourth body portion, an opening formed in the fourth body portion, a fifth mating rim portion for positioning adjacent the upper rim portion of the posterior portion, the second mating rim portion of the first lateral portion, and the fourth mating rim portion of the second lateral portion, and the anterior portion being hingedly connected to the posterior portion along the fifth mating rim portion and the upper rim portion, and being moveable between an open position and closed position relative to the posterior portion; wherein the helmet can be assembled around the head of the patient by placing the posterior portion adjacent a posterior portion of the head of the patient, moving the first lateral portion from the open position to the closed position to position the first lateral portion adjacent a first lateral side of the head of the patient, moving the second lateral portion from the open position to the closed position to position the second lateral portion adjacent a second lateral side of the head of the patient, and moving the anterior portion from the open position to the closed position to position the anterior portion adjacent a face of the patient such that a nasal cavity and an oral cavity of the patient are accessible through the opening in the anterior portion.