The Muscles and the Viscera

The muscular system of the Vertebrata consists of muscles related partly to the exoskeleton, partly to the endoskeleton, and partly to the viscera, and formed both of striated and unstriated muscular fibre. The latter is confined to the vessels, the viscera, and the integument; the parts of the endoskeleton being moved upon one another exclusively by striated muscular fibre. The muscles of the endoskeleton may be divided, like the endoskeleton itself, into one system appertaining to the trunk and head, and another belonging to the limbs.