Answer
The structures that open into the nasal cavity
include the
a. sphenoidal sinus
Work Step by Step
Air-containing mucosal-lined sinuses surround the nasal cavity, which includes the frontal, paired maxillary, sphenoid, and ethmoid sinuses. These cavities directly communicate with the nasal cavity. The secretions from these sinuses drain into the nasal cavity via the thin-walled ostia.
