The conchea consist of the inferior and superior conchea, and they are small bony curvatures on the sides of your sinus cavities that allow for greater surface area. The name comes from their shape which is like little concha shells.
They are bones in the nasal cavity (or parts of other bones in the nasal cavity) that cause turbulence in the air moving through the nasal cavity. This will warm and moisten the air to help protect the lungs. There are three conchae in the nasal cavity, a superior, middle and inferior conchae (aka turbinates).
the ethmoid bone consists of a number of thin-walled cellular cavities, the ethmoidal cells, arranged in three groups, anterior, middle, and posterior forgot to log in last time. but as i said before it is the ethmoid bone