r 



palpebral group. 173 



Palpebral Group. 



The palpebral, or muscles of the eyelids are four in number, 

 named as follows : — 



Orbicularis palpebrarum. 



Lachrymalis. 



Levator palpebrse superioris externus. 



Levator palpebrse superioris internus. 



ORBICULARIS PALPEBRARUM. 



{Musculus Ciliaris.) 



(Pl. XL 5. Fig. 70. //.) 



A large, thin, oval sphincter, common to the upper and lower 

 ■eyelids, and situated around them. 



Attachments. — It is covered by the skin, to which it inti- 

 mately adheres. The superior portion is the larger, and consists 

 of numerous fleshy fasciculi, with a small flat tendon which 

 is attached to the lachrymal tubercle, near the nasal angle 

 of the eye. 



Action. — It closes the eyelids. 



LACHRYMALIS. 



(Lachrymo-Lahialls.) 



A very thin muscle placed below and before the orbit, con- 

 tinuous with the levator labii superioris in front, the panniculus 

 behind, and the orbicularis palpebrarum above. It becomes 

 blended with the buccinator. 



LEVATOR PALPEBRiE SUPERIORIS EXTERNUS. 



{Fronto-super ciliaris.) 



(Fio. 70. e.) 



Situated immediately above the orbit, it is subcutaneous, short, 

 thin, and narrow. 



Attachments.- — It arises from the external surface of the 

 frontal bone, near the supra- orbital foramen. The fibres pass 

 ■downwards and outwards, blending with the orbicularis at the 

 Superior part of the lid, towards the inner angle of the eye. 



