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.
Deviated Septum Symptoms, Diagnosis and Treatment. Deviated Septum : The shape of the nasal cavity is very important for both cosmetic and medical reasons. The nasal septum is the wall which divides the nasal cavity into its two halves, thus providing its shape.