Peritubular myoid cells form a single layer of flattened cells which surrounds the Sertoli cells, circumscribing the testis cords. Their main functions include structural regulation of the forming testis cords, in conjunction with Sertoli cells, and promotion of the movement of mature sperm through the seminiferous tubules of the adult testis for export to the seminal vesicles, a function mediated by their smooth muscle-like character.
Peritubular myoid cells represent the only cell type in the testis for which no counterpart has been identified in the ovary. This might be due to their origin from immigrating cells from the mesonephros, which only occurs in an XY gonad after the expression of Sry.
Multiple AncestorsSingle AncestorNo DescendantsDevelops fromPart of Parent