TEM 18-3 In this section of a seminiferous tubule containing spermatogonia (3) the basement membrane (1) occurs adjacent to a peritubular myoid cell (2). In the interstitial space occurs a capillary (4) lined by endothelial cells (5) and abundant Leydig (interstitial) cells (6). Question- Which pituitary hormone regulates Leydig cell steroidogenesis. Answer- Luteinizing Hormone.