jVIusclcs of the Hea 



ead 



243 



Eyebrow 



Pars iirliitalis m. orbicularis ociili 



Pars paljicbralis 

 in. orbicuUiris oculi 



M. corrusator 



Ligamentuiu jjalpe- 

 brale luediale 



''^M \ 



Pars lacrimalis m. orbicularis oculi 

 (The overlying parts of the pars orbitalis have only been di-awn to one side.) 



288. Muscles of the right eyelid, viewed from in front. 



8inus frontalis 



Pars lacrimalis 

 lu. orbicularis 

 oculi 



Cellulae 

 ethiuoidales 



Cavuiii nasi 



M. corrugator 



The upper limit of the tarsus superior is 



igji^jSj^.^, _ '( indicated by the dotted lino 



Kaphe palpe- 

 bralis lateralis 



The lower limit of the tarsus inferior 

 is indicated bv the dotted line 



289. Muscles of the right eyelid, viewed from behind. 



M. orbicularis oculi (.see also Fig-s. 2S(i ami 2S7). Form: flat, elliptical. Position: 

 ill the eyelids and at their periphery. Pars orbitalis. Origin: pars nasalis oss. frontalis, 

 crista lacrimalis anterior maxillae, anterior limb of the lig. palpebrale mediale: the fibres 

 surround the eyelids in flat, concentric arches anc! ffiterweave with one another lateralward fi-om 

 the external angle of the eye or go to a thin, horizontal band of connectivi^ tissue (Raphe 

 palpehralis lateralis) which extends from the external angle of the eye to the lateral margin 

 of the orbit. Action: draws the eyebrow downward, the skin of^he cheek upward; helps to 

 close the lids. Pars lacrimalis [ Horueri] . Origin: crista lacriuialis posterior oss. lacrimalis ; 

 it runs lateralward l)ehind the tear-sac to the medial angle of the eye and spreads out thin 

 within the lids corresponding in extent to about that of the tarsi. In the lids it forms the 

 pars palpebralis. Action: widens tear-sac, closes eyelids. Innervation: n. facialis. 



