part of part of contributes to morphology of theca cell layer theca interna internal coat of capsule of Graafian follicle FMA:18658 BTO:0002851 Wikipedia:Theca_externa#Theca_interna MA:0001714 SCTID:258869006 tunica interna of theca folliculi ovary theca interna UBERON:0000157 UBERON:0005183 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. tunica interna thecae folliculi membranous layer reproductive structure