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.
A deviated septum is a common condition that involves a displacement of the septum, the wall that separates the nostrils, to one side of the nose. In adults, the septum is made of cartilage and bone, and helps to support the nose and its mucous membranes, and enables regular air flow.