Sinuses: Anatomy & Routine Projections - Video Lesson

Hey, everybody. Welcome to today's lesson on the gross anatomy and routine radiographic projections of the paranasal sinuses. This essential topic forms the foundation for accurate imaging and diagnosis of conditions related to the sinuses. In this lesson, we'll cover the anatomy of the sinuses and routine projections for radiographs. Let's get started. The large air filled cavities of the paranasal sinuses are lined with the mucous membrane that is continuous from the nasal cavity. They are divided into four groups named for the bones that contain them, maxillary, frontal, ethmoid, and sphenoid. The purpose of the sinuses is often debated. However, they are believed to serve as a resonating chamber for the voice, decrease the weight of the skull, and help warm and moisten inhaled air. Some also believe they act as shock absorbers in trauma and may control the immune system. The sinuses begin to develop early in the fetus, appearing as sacs or pouches of the nasal mucosa. As they grow,