human_reference_atlas part of Homo sapiens theca cell layer theca interna FMA:18658 BTO:0002851 Wikipedia:Theca_externa#Theca_interna MA:0001714 SCTID:258869006 theca interna tunica interna of theca folliculi ovary theca interna theca interna (folliculus ovaricus tertiarius) Theca interna cells express receptors for luteinizing hormone, which when activated will stimulate the production of androstenedione from cholesterol by the enzyme desmolase. Androstenedione ultimately gives the granulosa cells the precursor substrate for estrogen manufacturing. uberon internal coat of capsule of Graafian follicle AS theca interna UBERON:0005183 UBERON:0000157 tunica interna thecae folliculi membranous layer