78 



THE CAT. 



[CHAP. in. 



anterior and a posterior cormi springing from either end of a median 

 bony bar, " the body of the hyoid" (bh) t or basi-hyal. The basi-hyal 

 is a transversely-extended flattened bar of bone, which, in the 

 natural condition, is placed above the front part of the thyroid 

 cartilage of the larynx (T). At the front margin of each end is 

 attached a short cylindrical bone (about half the length of the basi- 

 hyal), called the cerato-hyal (ch). To the end of this, is again 

 annexed another long bone, called the epihyal (eh], at the end 



sh 



it- 



Fig. 45. H VOID APPARATUS, WITH LARYNX AND UPPER PART OF TRACHEA. 



A. Ventral view. 



B. Lateral view. 



u. Connexion of thyrohyal with thyroid carti- 

 lage. 



bh. Basi-hyal. 

 ch. Cerato-hyal. 

 ct. Crico-thyroid muscle. 

 eh. Epihyal. 



s. Sterno-hyoid muscle cut short. 

 st. Sterno-thyroid muscle cut short. 



t*. Cartilage of tympano-hyal. 



th. Thyro-hyal. 



ty. Thyro-hvoid muscle. 



tr. Trachea. 



p. Crico-thyroid ligament. 



C. Cricoid cartilage. 



T. Thyroid cartilage. 



1. Thyro-hyoid membrane. 



2. Crico-thyroid membrane. 



of which is another cylindrical bone, called the stylo-liyal (sh), 

 which is again longer than the epihyal. At the end of the stylo- 

 hyal is a cylindrical cartilage (*), which is the cartilaginous con- 

 tinuation of that minute cylindrical bone, the tympano-hyal, which 

 becomes anchylosed into the pit before noticed as existing in the 

 auditory bulla immediately on the inner side of the stylo-mastoid 

 foramen. 



This chain of ossicles, with its fellow of the opposite side, together 

 constitute the anterior cornua. (See also Fig. 46.) 



At the hinder margin of each end of the basi-hyal (just below the 

 attachment of the cerato-hyal) is a cylindrical bone attached, called 

 the thyro-hyal (th). This is about as long as the basi-hyal, and 

 shorter than the stylo-hyal. It is connected by membrane with the 

 upper border of the lateral part of the thyroid cartilage of the larynx. 



39. On examining in greater detail than heretofore, and with that 

 knowledge of its component bones which the foregoing pages may have 



