The air-filled spaces lined by mucous membranes found within flat and irregular bones in the body are called the sinuses.
<h3>What are bones?</h3>
The bones are the solid structures that we find in the body. The bones of a person are about two hundred and six in number. The primary function of the bones is to support the structure of the of the individual and to protect the vital and fragile structures such as the brain and the heart.
The air-filled spaces lined by mucous membranes found within flat and irregular bones in the body are called the sinuses.
