What is the Eastern Time Zone? The Eastern Timezone is an area 5 hours behind Greenwich Mean Time ( GMT-5 ) during the winter months (referred to as EST) and 4 hours behind Greenwich Mean Time ( GMT-4 ) during the summer months (referred to as EDT). From 2 A.M. on the second Sunday in March to 2 A.M. on the first Sunday in November, Daylight Saving Time is in effect.
WHAT ARE SINUSES? Sinuses are air pockets that are located within the bones of the skull and face and are connected to your nasal passages by small tubes or channels, the osteomeatal complex. These channels permit air to flow from the nose into the sinuses and allow drainage of mucous from each sinus into the nose.
Figure 7.4. Anterior View of Skull An anterior view of the skull shows the bones that form the forehead, orbits (eye sockets), nasal cavity, nasal septum, and upper and lower jaws. Inside the nasal area of the skull, the nasal cavity is divided into halves by the nasal septum.