The ear has external, central and internal parts. The outer ear is called a pinhole and is made of striated cartilage covered with skin. The sound passes through a pinna to the external ear canal, a short tube that ends at the tympanic membrane (tympanic membrane). The sound causes the eardrum and i...

The most common type of strokes, which is caused by a blood clot. A clot can form in an artery that supplies blood to the brain. A clot that forms in another place can travel through the blood vessels until it is trapped in one that supplies blood to the brain. When the blood can not reach a section...