A year of study is two semesters of study in the same or related subject area. In general, the course is about 50 minutes per day, five days a week, for two semesters. However, local school districts determine the actual organization of instructional time depending on their master schedule.
Medical Definition of middle meatus. : a curved anteroposterior passage in each nasal cavity that is situated below the middle nasal concha and extends along the entire superior border of the inferior nasal conchaâcompare inferior meatus, superior meatus.
The nasal cavity is the chamber between external and internal nares. Coiled, shelf-like extensions of bones called conchae (a.k.a. turbinates) extend from the lateral walls of the nasal cavity toward the nasal septum. Narrow passageways between the conchae are called meatuses.The air that passes through the meatuses is filtered, warmed and humidified.oiled, shelf-like extensions of bones called conchae (a.k.a. turbinates) extend from the lateral walls of the nasal cavity toward the nasal septum. Narrow passageways between the conchae are called meatuses. The air that passes through the meatuses is filtered, warmed and humidified.