38 STUDIES IN COMPARATIVE ANATOMY. 



jugular vein emerges close to the inner side of digastricus. The 

 parotid gland lies superficial to this muscle, and the external 

 carotid artery beneath it. 



Depressors of the Hyoid Bone. 



SUrno-hyoideus wanting. 



Sterno-thyroideus arises from the first rib, external to its 

 sternal articulation, and is inserted into the oblique line of the 

 thyroid cartilage. 



C. and L.— 276-7 (x^); 281, figs. 1,2 (x^) ; 287-8 (x"); 292-3 



Thyro-hyoideus arises from the oblique line of the thyroid 

 cartilage, and is inserted into the basi-hyoid. 



C. and L.— 276-7 {y) ; 281, fig. 2 {y) ■ 287-8 {y) ; 292-3 {y). 



These muscles occupy very much their usual position. Both 

 are overlaid by sUrtio-maxillaris, which extends nearly to the 

 middle line. The two thyro-hyoidei are almost continuous, but 

 the sterno-thyroidd divide so as to expose the larynx between 

 their internal edges. 



Muscles of the Tongue. 



Genio-glossus arises from the mandibular symphysis in its 

 whole depth, and is inserted into the under surface of the 

 tongue. The muscle has its usual fan-like arrangement, the 

 lower fibres being horizontal, the upper nearly vertical. 



C. and L.— 281, fig. 2 (t). 



Hyo-glossus major (Jiyo-glossus lateralis, Watson) arises from 

 the outer surface of the greater cornu of the hyoid bone. It 

 passes upwards and forwards to the side of the tongue, where 

 it blends with the other lingual muscles. 



C. and L.— 276-7 {v) ; 281, fig. 2 (v^) ; 287-8 (v) ; 292-3 {v^), 

 " cerato-glossus." 



Hyo-glossus minor (hyo-glossus anterior, Watson) arises from 

 the anterior edge of the body of the hyoid bone, immediately 

 adjacent to its fellow muscle, and is inserted into the lateral 

 margin of the tongue, blending with stylo-glossus. 



C. and L.— 281, fig. 2 (v), " hyo-glossus." 



Stylo-glossus arises from the apex of the anterior pointed pro- 



