THE MUSCLES OF THE HEAD. 97 



face with the galea aponeurotica (to which the muscle is closely 

 united), the epicranius muscle (//) and the temporal muscle (). 

 Action. Draws the two ears dorsad, toward the middle 

 line. 



FIG. 63. MUSCLES ON THE DORSAL SURFACE OF THE HEAD. 



On the right side are shown the superficial muscles; on the left side the super- 

 ficial muscles have mostly been removed,* exposing the deeper muscles and the bone. 

 a, M. intermedius scutulorum; i>, M. corrugator supercilii medialis; c, M. orbicularis 

 oculi; d, M. corrugator supercilii lateralis; e, cranial end fibres of M. platysma; f, 

 M. adductor auris superior; g, g' , M. levator auris longus (g. cranial portion; g 1 , 

 caudal portion); A, /i', M. epicranius (h, M. occipitalis; h' M. frontalis); z, M. trans- 

 versus auriculae; k, M. auricularis superior (cut on the left side); /, M. abductor 

 auris brevis; m, M. abductor auris longus; n. M. temporalis; a, cut origin of M. 

 frontoscutularis; p, p' , M. levator labii superioris alseque nasi (/', the origin from 

 the maxillary bone) ; g, angular head of M. quadratus labii superioris. i, scutiform 

 cartilage; 2, external ear; 3, bones of the skull. 



M. corrugator snpercilii medialis (). This consists of 

 a thin sheet of scattered fibres lying craniad of the last and 

 intermingling with it. The fibres take origin near the middle 

 line, pass laterad, then curve craniad, converging, to be 



