In the micro level of atherosclerotic atheroma : what is in the fibrous cap and necrotic center? Systemic Path - Vascular In the micro level of atherosclerotic atheroma : what is in the fibrous cap and necrotic center? Answer: Fibrous cap : foam cells, collagen, elastin macrophage, lymphocytes. Necrotic center: Debris, cholesterol crystals, foam cells, and calcium. Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+