MYOLOGY 129 



To tense the patagial region : 



Dermo-tensor patagii, 



Dermo-temporalis. 

 To cause the feathers to lie close to the body: 



Dermo-humeralis, 



Dermo-pectoralis. 

 To tense the lateral cervical integument: 



Dermo-temporalis. 

 To support the lingual apparatus and superior larynx: 



Platysma myoides. 

 To manipulate the feathers and skin of the inferior part of the neck : 



Cleido-trachealis. 

 To control the skin in the shoulder region: 



Dermo-spinalis. 

 To cause the feathers of the back to lie close to the skin: 



Dermo-iliacus. 

 To depress the humeral region: 



Dermo-idnaris. 

 To close the jaw: 



Temporalis, 



Pterygoideus intemus, 



Pterygoideus extemus, 



Masseter. 

 To open the jaw: 



Biventer maxilla, 



EntotjTnpanic. 

 To raise the trachea and hyoid apparatus: 



Digastricus. 

 To elevate the tongue: 



Mylo-hyoideus. 

 To pull the tongue to one side: 



Singly' — 



Cerato-hyoideus, 

 Stylo-hyoideus. 



Alone when the larynx is fixed — 

 Stemo-hyoideus. 

 Those which protrude the tongue from the mouth: 



Together — 



Cerato-hyoideus 

 Genio-hyoideus. 

 To aid in deglutition: 



When the base of the tongue is fixed— 

 Stemo-hyoideus. 

 To depress the tongue: 



Together — 



Stemo-hyoideus. 



' Muscles are arranged in pairs. Singly means one muscle acting alone, i.e., 

 without its fellow; together means acting both at the same time. 

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