THE MUSCULAR SYSTEM 55 



The muscles of the body are of two kinds the volun= 

 tary (striped muscles), which are capable of being moved 

 or controlled by the efforts of the will, and the involun= 

 tary (non-striped), those that are not under the control 

 of the will. The former make up the larger bulk of the 

 muscular system ; the latter are found in the blood-vessels 

 and in the walls of most of the hollow viscera. 



For descriptive purposes the muscles of the body are 

 arranged in divisions according to their location: as, the 

 head, face, and neck muscles ; the trunk muscles ; the mus- 

 cles of the upper and of the lower extremities. 



As has been previously stated, iiLjthfe connection only 

 the most important points that a nurse should know, or 

 become familiar with, will be described; as, for example, 

 the important relation each organ and muscle bears to 

 life, its action, and, in the case of the muscles of the 

 head and face, the role they play in lending expression to 

 the countenance. 



To facilitate description, muscles are divided into groups 

 that take their names from the regions in which they are 

 located. Thus we have, in the head and face, the follow- 

 ing regions: the epicranial, auricular, palpebral, orbital, 

 superior maxillary, inferior maxillary, temporomaxillary, 

 pterygomaxillary, etc. 



MUSCLES OF THE HEAD AND FACE 

 The Occipital Region. The first muscle to be 

 described is the occipitofrontalis. You will note that 

 the prefix occipito- relates to the occipital bone, and the 

 suffix -frontalis, to the frontal bone, showing that the mus- 

 cle extends from the posterior part of the head (occiput) 

 to the eyebrows. All muscles derive their names in this 

 way, and if students will study these names carefully, they 

 will become fully acquainted with the origins and inser- 

 tions of the muscles. 



