30 ANATOMY OF THE DOMESTIC FOWL 



Description. The temporal bones consist of the fused squamous 

 and petrous temporals; they contain the essential organs of hearing. 



The squamous portion of the temporal bone possesses the long 

 thin zygoma tic process sometimes called the posterior orbitalis. 

 It forms a small flattened tongue, directed forward, sometimes 

 free, and at other times united by its superior border to" the 





FIG. 8. Inferior view of the skull of a hen. i, Occipital. 2, Foramen mag- 

 num. 3, Occipital condyle and just below the basi-occipital. 4, Foramen for 

 the passage of the hypoglossal nerve. 5, Foramen for the passage of the vagus. 

 6, Canalis caroticus and jugulare. 7, Sphenoid. 8, Temporal wings of the 

 sphenoid. 9, Foramen auditiva. 10, Os articulare. n, Os angulare. 12, 

 Vomer. 13, Os dentale. 14, Pterygoid. 



summit of the orbital process. This is especially true in the turkey. 

 This process is seen near the lower outer portion of the posterior 

 orbital wall. The squamous portion is also provided antero- 

 laterally with an articular facet which articulates with the quadrate 

 bone. The large portion of the temporal bone lies on the side of 



