What is the name of the bony and cartilaginous partition that divides the nasal cavity?

The nasal septum is the correct term for the bony and cartilaginous partition that divides the nasal cavity into two nostrils. This structure plays a crucial role in supporting the nasal passages and maintaining proper airflow and function of the respiratory system.

The nasal septum consists of both bone and cartilage; the bony part is formed by the perpendicular plate of the ethmoid bone and the vomer, while the cartilaginous part is composed of the septal cartilage. This division helps in the effective filtration and humidification of inhaled air as well as in the regulation of airflow.

Other choices mentioned, such as the nasal conchae, are structures that are involved in warming and humidifying the air as it passes through the nasal cavity but do not serve to separate the cavity itself. The palatine bone contributes to the structure of the hard palate and mouth but does not play a direct role in the partition of the nasal cavity. Septal cartilage is part of the nasal septum but does not refer to the entire partition. Thus, identifying the nasal septum as the correct answer recognizes the comprehensive structural element that specifically separates the nasal cavities.