In 1839, Theodor Schwann would expand Schleiden's cell theory to include the animal world, establishing cell theory as the fundamental concept in biology. Schleiden included this article and others in a botany textbook--one that introduced new teaching methods which would dominate the instruction of botany for years.
Nasal septum: The dividing wall that runs down the middle of the nose, separating the two nasal ' cavities, each of which ends in a nostril. The nasal septum is composed of bone, cartilage, and 'membranes.
Nasal refers to the nose. The nasal cavity is the air passage starting at the nostril (opening of the nose) and ending at the back of the throat. Nasal Obstruction is a partial or complete blockage of one or both of these air passages.