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.
Interatrial septum, the wall of tissue that is a sectional part of the left and right atria of the heart; Interventricular septum, the wall separating the left and right ventricles of the heart; Lingual septum, a vertical layer of fibrous tissue that separates the halves of the tongue; Nasal septum: the cartilage wall separating the nostrils of the nose