NAMES OF EXTERNAL PARTS AND DEFINITIONS. 



It is the smooth and rounded under-part of the lower jaw, in 

 which the curb chain should rest when a curb bit is used. 



The angles of the lower jaiv (g) are the bony angles 

 between which the upper end of the wind-pipe lies. 



The branches of the lower jaw run from the chin-groove to 

 the angles of the lower jaw. 



The occipital crest is the bony prominence which con- 

 stitutes the top of the head, and which more or less rises 

 between the ears. It is particularly high in the head shown 

 in PI. 26. 



Neck (2). — The neck is separated from the shoulders by 

 a line which goes from the dip that is just in front of the 

 withers, to the depression which is made by the union of the 

 neck and breast. 



The poll {v) is the part which is on the top of the neck 

 and is immediately behind the ears. 



The crest {t) is the upper part of the neck, extending from 

 the withers to the ears. 



Th.&j?ig?ilar groove {it) is the groove which is on each side 

 of the neck, just above the wind-pipe. It is well shown in 

 Pis. 20 and 35. 



Breast and Chest. — Among horsemen who are un- 

 acquainted with anatomy, the latter of these two terms is 

 frequently used to express the former. At the risk of 

 employing a word contrary to colloquial custom, I would 

 suggest that the term " chest " be applied exclusively to the 

 cavity which occupies nearly the front third of the trunk, and 

 in which the lungs and heart are situated. It is divided from 

 the belly (abdomen) by the diaphragm. (See Fig. 4.) 



