What anatomical structure is typically affected in a blowout fracture?

A blowout fracture primarily involves the orbital floor, which is directly related to the maxillary sinus. When significant force impacts the eye area, the pressure can cause fractures in the thin bones of the orbit, particularly in the region of the maxillary sinus. The relationship between the orbit and the maxillary sinus is critical, as the floor of the orbit is composed of the maxilla. Therefore, a fracture in this area can lead to herniation of orbital contents into the maxillary sinus, resulting in complications. Understanding the anatomy helps clarify why the maxillary sinus is the structure most commonly affected in this type of fracture.