The patient is referred for an

ultrasound examination of the right carotid artery after the examination

reveals a significant murmur in it. The murmur is not audible either in the

left carotid artery or in the heart; the ultrasound confirms that the murmur is

caused by a significant atherosclerotic plaque that has already narrowed the

right carotid artery significantly, causing turbulent blood flow in the

narrowed area and a murmur audible by phonendoscope. Atherosclerotic plaque is

formed by lipid deposition in the tunica intima and its further inflammatory

transformation. What layers does the tunica intima consist of in a healthy

person?