300 ANATOMY OF THE RABBIT 



the opposite side, from the manubrium sterni. Insertion: 

 Mastoid process of the skull. 



(/) The sternohyoideus. Origin : In common with that of the 

 opposite side, from the dorsal surface of the manubrium 

 and anterior portion of the body of the sternum, extending 

 to the third costal articulation. Insertion: Greater cornu 

 of the hyoid. 



The two muscles are closely associated in the middle 

 line. They should be separated from each other and 

 divided. 



(g) The sternothyreoideus. Origin: In common with the 

 sternohyoideus. Insertion: Lateral plate of the thyreoid 

 cartilage of the larynx. The muscle forms a thin band 

 lying on the side of the trachea. It is continued from the 

 thyreoid cartilage to the greater cornu of the hyoid as the 

 thyreohyoideus. 



(h) The trachea occupies a median position. It is supported 

 by cartilaginous tracheal rings, each of which is incomplete 

 dorsally thus allowing brief partial compression. 



(i) The thyreoid cartilage of the larynx ; a saddle-shaped 

 cartilage, composed of right and left thyreoid plates 

 (Fig. 91) completely fused with each other ventrally. 



(j) The cricoid cartilage, a thick annular cartilage situated 

 between the thyreoid cartilage and the first tracheal ring. 

 It is connected ventrally with the thyreoid cartilage by the 

 cricothyreoideus muscle. 



(k) The deep cervical lymph gland (lymphoglandula cervicalis 

 profunda) is a large, elongated, reddish-coloured gland 

 in the upper portion of the neck, opposite the thyreoid 

 cartilage. 



This gland receives lymph vessels from the root of the tongue, 

 the pharynx, and the larynx and empties into the jugular trunk through 

 a vessel which accompanies the internal jugular vein. 



(/) The thyreoid gland (gl. thyreoidea) lies on the ventral and 

 lateral surfaces of the trachea behind the cricoid cartilage. 

 It is composed of right and left portions connected across 



