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.
Understanding A Deviated Septum. The septum is a thin barrier that is made up of cartilage that separates the two nostrils. Generally the septum is thought to be located midway between the two areas, dividing them equally. A deviated septum occurs when this partition is off-center, shifting prominently to one side.