<P> In the midline of the nose , the septum is a composite ( osseo - cartilaginous ) structure that divides the nose into two ( 2 ) similar halves . The lateral nasal wall and the paranasal sinuses , the superior concha , the middle concha , and the inferior concha , form the corresponding passages , the superior meatus , the middle meatus , and the inferior meatus , on the lateral nasal wall . The superior meatus is the drainage area for the posterior ethmoid bone cells and the sphenoid sinus ; the middle meatus provides drainage for the anterior ethmoid sinuses and for the maxillary and frontal sinuses ; and the inferior meatus provides drainage for the nasolacrimal duct . </P>
what is the name of the skin between your nostrils
septum