Final answer:
The ethmoid bone contains sinuses divided into three main groups.
Step-by-step explanation:
The bone that contains sinuses divided into three main groups is the ethmoid bone. The bone that contains sinuses divided into three main groups is the ethmoid bone. The paranasal sinuses, air-filled spaces named for the skull bone that each occupies, include the frontal sinus, which is the most anterior. The largest are the maxillary sinuses located in the right and left maxillary bones. The most posterior is the sphenoid sinus, found in the sphenoid bone. The ethmoid bone contains multiple small spaces known as ethmoid air cells.