 He became a member of Accademia del Cimento and had long discussions with Francesco Redi.Like Vincenzo Viviani, Steno proposed a geometrical model of muscles to show that a contracting muscle changes its shape but not its volume.During his stay in Amsterdam, Steno discovered a previously undescribed structure, the ""ductus stenonianus"" (the duct of the parotid salivary gland) in sheep, dog and rabbit heads.