Sphenoid sinuses â behind the ethmoids in the upper region of the nose and behind the eyes. Each sinus has an opening into the nose for the free exchange of air and mucus, and each is joined with the nasal passages by a continuous mucous membrane lining.Therefore, anything that causes a swelling in the nose-an infection, an allergic reaction, or an immune reaction-also can affect the sinuses.inusitis is an acute or chronic inflammation of the nasal sinuses. Health care experts usually divide sinusitis cases into three categories based on the duration and frequency of occurrence.
President Thomas Jefferson commissioned the Corps of Discovery Expedition (1804-06), led by Meriwether Lewis and William Clark, to explore the territory acquired in the Louisiana Purchase, among other objectives. In 1801, Spain signed a secret treaty with France to return Louisiana Territory to France.
Lewis had been personal assistant to President Thomas Jefferson, who authorised the expedition to find a water route through the Rocky Mountains to the west coast, make friendly contact with the native Indians and report on matters of scientific interest.