That would be the vomer.
The inferior portion of the nasal septum in the back is formed by the perpendicular plate of the ethmoid bone and the vomer bone. These bones help to separate the left and right nasal cavities and contribute to the structure of the nasal septum.
The vomer.
Vomer
That's correct. The vomer is a thin, flat bone that forms the lower and posterior part of the nasal septum, helping to separate the left and right nasal cavities in the skull.
The inferior nasal concha, a separate bone from the ethmoid bone, forms the most inferior turbinates in the nasal cavity.
The vomer is the inferior bone of the nasal septum. It is located in the midline of the nasal cavity, separating the left and right nostrils. The vomer articulates with the ethmoid bone superiorly and the maxillary bone anteriorly.
Nasal septum
Vomer Bone
Cartilage
Vomer, a facial bone, and Ethmoid bone, a cranial bone, form the nasal septum
On either side of the nasal septum in the upper portion of the nasal cavity are the nasal conchae, also known as nasal turbinates. These structures, which include the superior, middle, and inferior conchae, are bony projections that help to increase the surface area within the nasal cavity, facilitating airflow and enhancing the processes of filtration, humidification, and warming of inhaled air. Additionally, they play a role in olfaction by directing airflow towards the olfactory receptors located in the upper nasal cavity.
Hyaline Cartilage