Answer:
They contribute to the walls the floor and lateral walls of the nasal cavity, the floor of the orbits, and the roof of the mouth. They help to form the pterygopalatine and pterygoid fossae. The ethmoid bone is a singularbone that makes up the middle area of the viscerocranium. It forms the middle of the skull, moulding the orbit, nasal cavity, nasal septum and the floor of the anterior cranial fossa.
Explanation:
