DISSECTION OF THE HEAD AND NECK 



249 



Platysma. 



Muscles of the external ear. 



(a) M. auricularis anterior (already studied). 



(b) M. auricularis posterior (already studied). 



(c) M. auricularis superior (already studied). 

 Muscles of the eyelids. 



Dilators. 



(a) M. epicranius (already studied). 



Note that the principal dilator, the M. levator palpebrae superioris, 

 is not a skin-muscle. 



FIG. 104. 



Pericranium^ 

 M. orbicularis oculi 

 (parsorbitalis) 

 M. corrugator 

 supercilii.. 



M. orbicularis oculi 

 (pars palpebralis) 



Ltg. palpebrale 

 mediate 

 M. procerus 



M. quadra- 



tus labii 



superioris 



M. auricularis 

 superior 



M. auricularis 

 anterior 



Caput 



angulare 



Caput 



infra- 



orbitale 



... M. caninus 

 M. zygomaticus 

 M. risorius 



M. triangularis 



> 



Platysma 



M. quadratus labii inferioris 



M. transversus menti ( Var. 



The muscles of the face. (After Toldt, Anat. Atlas, Wien, 1900, 2 Aufl., p. 296, Fig. 537.) 



Constrictors. 



(a) Procerus ("prolonged") muscle (M. procerus) (0. T. pyramid 



alis nasi). 



This muscle is wrongly classed as a part of the M. frontahs. 

 Comparative anatomy has shown it to have been derived from 

 the muscle which lifts the lip. Note that the M. procerus is an 

 antagonist of the M. frontalis. 



(b) Orbicular muscle of eye (M. orbicularis oculi) (0. T. orbiculan 



palpebrarum). 

 (ba) Palpebral part (pars palpebralis). 



