Medicine All are true about thymus, EXCEPT: A Derived from third and fouh pharyngeal pouch B Located in the anterior mediastinum C It is composed of epithelial and stromal cells D The medulla of thymus contains 85 % of the lymphoid cells 💡 Explanation All are true about thymus, EXCEPT: ✓ Correct Answer: D. The medulla of thymus contains 85 % of the lymphoid cells