158 EQUINE ANATOMY. 



(3) Scutifoi'm. — 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-aujicularis. 



Origin. — Zygomatic process of temporal. 

 Insertion.' — Outer side of base of concha. 

 Action. — Carries ear forward. 



2. Temporo-auricularis exiernus. 

 Origin. — Parietal ridge. 



Insertion. — Conchal and scutiform cartilages. 

 Action. — Draws ear forward and inward. 



3. Sctito-auricularis extemus. 

 Origin. — Scutiform cartilage. 

 Insertion. — Inner side of concha. 

 Action. — Rotates concha. 



4. Cervico-auiicularis superior. 



Origin. — From external temporo-auricular. 

 Insertion. — Posterior face of concha. 

 Action. — Draws it back. 



5. Cervico-auricularis mediiis. 

 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. 

 Insertiofi. — Base of concha. 

 Action. — Like preceding. 



7. Parotido-auricularis, 

 Origin. — Outer surface of parotid. 

 Insei'tion. — 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. 

 Action. — Adductor. 



