Editing Nicolas Steno (section)

=== Anatomy ===
During his stay in Amsterdam, Steensen discovered a previously undescribed structure, the "''[[Parotid duct|ductus Stenonis]]''" (the duct of the [[Parotid gland|parotid salivary gland]]) in sheep, dog and rabbit heads. A dispute with Blasius over credit for the discovery arose, but Steensen's name remained associated with this structure known today as the [[parotid duct|Stensen's duct]].{{sfnp|Kermit|2003}} In Leiden, Steensen studied the boiled [[heart]] of a cow, and determined that it was an ordinary [[muscle]].{{sfnp|Tubbs et al.|2010}}{{sfnp|Andrault|2010}} and not the center of warmth as [[Galenus]] and Descartes believed.<ref>Kooijmans (2007), p. 45.</ref> In [[Florence]], Steensen focused on the [[muscular system]] and the nature of [[muscle contraction]]. He became a member of [[Accademia del Cimento]] and had long discussions with [[Francesco Redi]]. Like [[Vincenzo Viviani]], Steensen proposed a geometrical model of muscles to show that a contracting muscle changes its shape but not its [[volume]].{{sfnp|Kardel|1990}}{{sfnp|Kardel|1994|p=1}}
{{clear left}} Steensen was the first to describe the [[lateral line]] system in fish.{{citation needed|date=February 2024}}