What separates the nostrils in the human anatomy?

The nasal septum is a thin wall of cartilage and bone that divides the left and right nostrils in the human nose. It plays a crucial role in supporting the function of the nasal passages by ensuring that airflow is directed properly through each nostril. The septum is essential for maintaining symmetry and enabling effective breathing, as it separates the nasal cavities and helps to regulate airflow patterns. Proper development and alignment of the nasal septum are important for overall nasal function, including olfaction (sense of smell) and the filtering of inhaled air.

The other options do not serve the purpose of separating the nostrils. The nasal cavity refers to the larger internal space where the nostrils lead but does not specifically divide them. The palate forms the roof of the mouth and is not involved in the structure of the nose. The sphenoid bone is a bone at the base of the skull that contributes to the eye sockets and the sides of the skull but does not relate to the separation of the nostrils.