174 MYOLOGY. 



Relation, — Externally with the skin; internally with the 

 bone. 



Action,^-lt corrugates the skin of the upper eyelid, but is 

 scarcely a levator. 



LEVATOR PALPEBRE SUPERIORIS INTERNUS. 

 {Orbito-palpehralis. ) 



Situated within the orbital fossa, in relation with the superior 

 straight tnuscle of the eyeball, this muscle is narrow, thin, and 

 band-like. 



Origin. — From the superior border of the optic foramen, on a 

 level with the lachrymal gland, passing under which it becomes 

 aponeurotic, running between the conjunctiva and the fibrous 

 portion of the upper lid. 



Insertion, — To the inner surface of the lid, and the tarsal 

 cartilage. 



Action, — It raises the upper eyelid. 



AuEicuLAR Group. 



The external muscles of the vear consist of an extrinsic and an 

 intrinsic group. The extrinsic muscles, eight in number, are as 

 follows : — 



Attollens maximus. 



AttoUens anticus. 

 Attollens posticus. 



Abducens. 



Mastoido-auricularis. 



Retrahens extemus. 

 Retrahens medius. 

 Ketrahens intemus. 



ATTOLLENS MAXIMUS. 



(Temporo-auricularis Extemus. ) 



(PL. IL 2V 



Situated immediately under the skin, above the temporal 

 muscle, and in front of the inner side of the ear, it is broad, 

 ^hin, and fleshy. 



Origin, — From the whole of the parietal crest, joining its 

 fellow in the mesian line posteriorly. 



Insertion, — To the scutiform cartilage, sending a small band- 

 to the internal border of the base of the conchal cartilage. 



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