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.
The overall nasal profile mirrors that of the septum profile. The nasal septum functionally stabilizes the nose much like a foundation supports and stabilizes a home or a skyscraper. Without a strong foundation a building will collapse. The nose is no different. Septal perforations can destabilize the nose and lead to nasal collapse.