👉 Dorsal sinus, also known as a nasal cavity, is a hollow space between the roof of the nose and the floor of the mouth. It contains a number of structures that are vital for breathing and for the proper functioning of the body. The term "dorsimesal" refers to the part of this structure where the nasal cavity meets the ventral sinus of the midline, or middle ear. The nasal cavity is divided into two parts: the outer nasal cavity, which contains the
