Lying behind your eyebrows, behind your cheekbones, and between your eyes are your sinuses — air-filled cavities lined with a mucous membrane that filters and humidifies the air you inhale. This ...

The coronary sinus is a collection of smaller veins that merge together to form the sinus (or large vessel), which is located along the heart’s posterior (rear) surface between the left ventricle and ...

Sinusitis can cause facial pressure, sinus headache, and other symptoms. Treatment may depend on the cause. A sinus infection, also known as sinusitis or rhinosinusitis, occurs when your nasal ...

- any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities ...