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.
They include. 1  Deviated septum - a shifting of the wall that divides the nasal cavity into halves. 2  Nasal polyps - soft growths that develop on the lining of your nose or sinuses. 3  Nosebleeds. Rhinitis - inflammation of the nose and sinuses sometimes caused by allergies.  Nasal fractures, also known as a broken nose.