This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Lpithelioid cells include which of the following: 
Select and explain. 
A. Islet cells of pancreas, B. Theca lutein cells, C. Cells of Brunner's gland, D. Interstitial cells of Leydig
D: Interstitial cells of Leydig
Answer: D: Interstitial cells of Leydig 
Explanation: Ans. d. Interstitial cells of LeydigIn all mammalian species, Leydig cells are located in the interstitial compament of the testis, between and surrounding the seminiferous tubules. Human Leydig cells are epithelioid and ovoid or polygonal.""The mammalian Leydig cell is a polyhedral epithelioid cell with a single eccentrically located ovoid nucleus. Frequently, lipofuscin pigment and rod-shaped crystal-like structures 3 to 20 micrometres in diameter (Reinke's crystals) are found. These inclusions have no known function, are found in less than half of all Leydig cell tumors, but serve to clinch the diagnosis of a Leydig cell tumor.