MUSCLES 43 



Reflect the sterno-mastoid muscle. 



2. The Sterno-hyoid is a similar muscle, lying be- 

 neath the sterno-mastoid, and covering the trachea 

 along the mid-ventral line. It arises on the first 

 costal cartilage, and is inserted on the basi-hyal 

 bone. (Plate IV.) 



Reflect the sterno-hyoid muscle. 



3. The Sterno-thyroid is a slender muscle which 

 arises from the anterior end of the manubrium, 

 below the origin of the sterno-hyoid. It is 'in- 

 serted on the thyroid cartilage of the larynx. 

 (Plate IV.) 



4. The Digastric is a relatively large muscle, 

 situated at the angle of the mandible. It arises 

 from the skull, posterior to the external auditory 

 meatus, and is inserted along the inner surface of 

 the anterior half of the mandible. (Plates II., 

 III., and IV.) 



5. The Mylo-hyoid is the flat muscle, the fibres 

 of which run transversely between the rami of 

 the lower jaw. It arises on the inside of the man- 

 dible, and is inserted on the basi-hyal bone, and in 

 the median raphe. (Plate IV.) 



Reflect the mylo-hyoid. 



6. The Genio-hyoid is a small, thin muscle, lying 



