They also consist of granulosa cells and theca of follicle. Five ovaries were obtained and dissected to collect theca and granulosa cells. Specifically, the study focused on secretion in porcine theca and granulosa cells, controlling gonadotropic stimulation. LH acts on Leydig cells in the male testes and theca cells in the female. Outside the basal lamina, the layers theca interna and theca externa are found. Hyperthecosis is hyperplasia of the theca interna of the ovary. Stroma-like theca cells are recruited by oocyte-secreted signals. Thecomas or theca cell tumors are benign ovarian neoplasms composed only of theca cells. The theca folliculi comprise a layer of the ovarian follicles. The theca are divided into two layers, the theca interna and the theca externa. Granulosa and theca cells continue to undergo mitotis concomitant with an increase in antrum volume. The theca externa is the outer layer of the theca folliculi. The outer cells of the theca form the epidermis. The theca is a secreted covering predominately composed of cellulose or other polysaccharides. The theca is relatively small and contains the crinoid's digestive organs.