Also known as the tympanic cavity, the middle ear is an air-filled, membrane-lined space located between the ear canal and the Eustachian tube, cochlea, and auditory nerve. The eardrum separates this space from the ear canal. The area is pressurized. The eardrum acts as a natural boundary between the middle ear and the ear canal. Pressure in the middle ear is maintained through the Eustachian tubes, which are closed when not in use. Each time a person swallows, the Eustachian tubes open and allow fresh air to enter into the tympanic cavity.
Detailed list of causes of Low blood platelet level. The list below shows some of the causes of Low blood platelet level mentioned in various sources: 1  Albers-Schonberg disease -- malignant recessive form-low blood platelet level. 2  Aplastic anemia-low blood platelet level.
1 Leukopenia: A low white blood cell count. A decrease in the production of functional leukocytes (white blood cells) weakens the body's immune defense, which can make you more prone to infections.  Thrombocytopenia: A low blood platelet count. Platelets are the blood cells responsible for blood clotting.