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 lower part of the nose is made up of cartilages which are responsible for the shape of external features of the nose. The nose bridge and the septal cartilage form the nasal septum.This nasal septum separates the nostrils.he attachments of your nostrils on each side to your cheeks are called alae. If your nasal septum is crooked or deviated because it grew that way, or because you suffered a nasal injury with a fracture of your nose and septum, then the outside shape of your nose may be crooked in the same way.