Theca interna
Theca interna cells express receptors for luteinizing hormone to produce androstenedione, which via a few steps, gives the granulosa the precursor for estrogen manufacturing.
After rupture of the mature ovarian follicle, the theca interna cells differentiate into the theca [lutein cell]s of the corpus luteum. Theca lutein cells secrete androgens and progesterone. Theca lutein cells are also known as small luteal cells.