134 ANATOMY OF THE DOMESTIC FOWL 



To pull the tail downward and to one side: 



Singly 



Lateralis coccygis. 



Depressor coccygis, 

 Lateralis caudae. 

 To close the eyelids: 



Orbicularis palpebrarum. 

 To raise the superior eyelid: 



Levator palpebrae superioris : 

 To pull the lower eyelid downward: 



Depressor palpebrae inferioris. 

 To pull the membrana nictitans over the eyeball: 



Quadratus nictitans, 



Pyramidalis nictitans. 

 To rotate the eyeball: 



Obliquus superior, 



Obliquus inferior. 

 To pull the eyeball upward: 



Rectus superior. 

 To pull the eyeball downward: 



Rectus inferior. 

 To pull the eyeball outward: 



Rectus externus. 

 To pull the eyeball inward: 



Rectus internus. 

 To tense the ear drum: 



Tensor tympani. 

 To relax the ear drum: 



Circumconcha. 

 To depress the humerus: 



Pectoralis major. 

 To raise the humerus: 



Pectoralis secundus, 



Pectoralis tertius. 



