124 ANATOMY OF THE DOMESTIC FOWL 



Flexor Perforans Digitorum Profundus (Fig. 24, No. 24 and 

 Fig. 25, No. G, 3). Location. The posterior tibial region. 



Origin. From the posterior part of the external condyle of the 

 femur, from the posterior part of the tibia just below the summit, 

 and from a point near the origin of the soleus. 



Insertion. Its heavy flattened tendon passes through the tibial 

 cartilage, this tendon dividing, the branches pass along the under 

 side of the toes, perforating the outer tendons and become inserted 

 to the proximal tubercle at the base of the under side of the ungual 

 phalanxes of the second, third, and fourth toes. 



Shape. Long, fleshy, with a long tendon. 



Relations. Closely with the tibial bone; the deepest of all the 

 flexors. 



Action. Flexes the digits. 



THE MUSCLES OF THE EYE 



Orbicularis palpebrarum Levator palpebrae su- 



perioris 



Depressor palpebrae inferioris Quadratus nictitans 



Pyramidalis nictitans Obliquus superior 



Obliquus inferior Rectus superior 



Rectus inferior Rectus externus 

 Rectus internus 



Orbicularis Palpebrarum (Fig. 7, No. 30). (Synonym. Orbicu- 

 laris oculi.) 



Location. Upon the lacrimal and maxillary bones. 



Origin. From the lacrimal and maxillary bones and the ciliary 

 margin. 



Insertion. To the lower free edge of the tarsal cartilage. 



Shape. Thin, delicate layer of fibers. 



Relations. Externally, with the skin; internally, with the lacri- 

 mal and the maxillary bones. 



Action. Aids in closing the eye. 



Levator Palpebrae Superioris (Fig. 7, No. 24). Location. Along 

 the superior roof of the orbit. 



Origin.- Along a longitudinal line found near the middle of the 

 roof of the orbit. 



