The Muſcle whereby he [the hedgehog] is enabled to draw himſelf thus together, and gather up his whole Body like a Ball, the Pariſian Academiſts deſcribe to be a diſtinct Carnoſe Muſcle, extended from the Oſſa innominata to the Ear and Noſe, running along the Back-bone, without being faſtned thereto.
Source: wiktionary