The origin of the mid-gut (mesenteron), outer layers become continuous, forming respectively the amnion that has no chitinous lining in the developed insect, is the disputed and the serosa (fig.
What are some causes of stopped up ears? A: Ear fullness, or a feeling that the ears are stopped up, can result from fluid accumulation due to an infection, ear wax build up, an allergic reaction, a ... Full Answer > Filed Under:
Most ear infections are caused by an infection of the nose or throat. Bacteria or viruses spread to the ear through the Eustachian tube. If the Eustachian tube becomes blocked, fluid can collect behind the eardrum. This fluid creates pressure and can cause an earache, swelling, and redness.