Chapter 6 The Muscular System 73 Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Name ________________________________________________________________ 3. Tetanus is often referred to as “lockjaw” because one of the first symptoms to arise is muscle spasms and cramping of the facial muscles. A spasm or cramp of which muscle(s) in particular would result in the inability of a patient to open the mouth, therefore presenting with a “locked jaw”? _ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ _________________________________________________________________________________________________________________ 4. Complete the following table to describe the origin, insertion, action, and functional group or anatomical region for the muscles of the trunk. Muscles of the Trunk Muscle Attachment Primary Action Group/Region Origin Insertion Diaphragm External intercostal External oblique Internal intercostal Internal oblique Iliocostalis Longissimus Rectus abdominis Quadratus lumborum Spinalis Trapezius Goodheart-Willcox Publisher