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| Description: Mullerian-inhibiting substance (MIS) causes apoptosis of cells in the Mullerian ducts in developing males. So, no structures develop from the ducts in male reproductive systems. Testosterone in developing males secreted by interstitial cells in the testes stimulates the development of the mesonephric ducts into the epididymis, vas deferens, ejaculatory duct and seminal vesicles. Before differentiation, all embryos have: Urethral (urogenital) folds Urethral groove Genital tubercle Labioscrotal swelling Picture Stats: Views: 223 Filesize: 462.95kB Height: 1000 Width: 673 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40595 |