158 EQUINE ANATOMY. 



(3) Scutijorm. A small plate lying in front of the base of the 

 concha and attached to it. 



Muscles. 



There are a few intrinsic muscular fibres of little importance. 

 Extrinsic are 



1. Zygomatico-auricularis. 



Origin. Zygomatic process of temporal. 

 Insertion. Outer side of base of concha. 

 Action. Carries ear forward. 



2. Temporo-auricularis externus. 

 Origin. Parietal ridge. 



Insertion. Conchal and scutiform cartilages. 

 Action. Draws ear forward and inward. 



3. Scuto-auricularis externus. 

 Origin. Scutiform cartilage. 

 Insertion. Inner side of concha. 

 Action. Rotates concha. 



4. Cermco-auricularis superior. 



Origin. From external temporo-auricular. 

 Insertion. Posterior face of concha. 

 Action. Draws it back. 



5. Cermco-auricularis medius. 

 Origin. Preceding and following. 

 Insertion. Base of concha. 



Action. Rotates concha out and back. 



6. Deep cervico-auricularis. 



Origin. Under and upper extremity of parotid. 

 Insertion. Base of concha. 

 Action. Like preceding. 



7. Parotido-auricularis. 



Origin. Outer surface of parotid. 

 Insertion. Base of and outside of concha. 

 Action. Adducts ear. 



8. Temporo-auricularis internus. 



Origin. Under superficial of same name, from intra-parietal 

 ridge. 



Insertion. Inner side of concha. 

 A ction. Adductor. 



