332 



DR. C. F. SONNTAG ON THE ANATOMY, 



inner end of the clavicle. It gives attachment to a few fibres of 

 the pectoralis major, but it is not enveloped by the latter as 

 described by Gratiolet and Alix (23).. In the neck it forms a 

 wide, comparatively thin muscle, whose fibres are coarse. It is 

 inserted into the outer half of the superior curved line of the 

 occipital bone, overlapping the trapezius. No fibres are attached 

 to the mastoid process. Between the sterno-mastoid and 

 subjacent cleido-mastoid there are muscular branches of the 



Text-figure 30. 



Muscles o£ the middle of tlie ueck. L.G : lymphatic glands ; O.A.S : opening into 

 the air-sac from the ventricles of the larynx ; 0-H.M : omo-hyoid muscle ; 

 S.M.G: submaxillary gland; S-T.M: sterno-thyroid muscle; T.C : thyroid 

 cartilage ; S3r-H.M : stylo-hyoid muscle ; Tra : trachea. Other letters in text. 



occipital artery. The external jugular vein does not cross the 

 surface of the muscle, and the transverse cervical nerve, after 

 emerging from beneath the cleido-mastoid, runs forwards over the 

 surface of the sterno-mastoid. The sterno- and cleido-mastoids 

 are separate throughout, though closely apposed and surrounded 

 by fascia. 



The cleido-mastoid (text-fig. 30, 0-M.M) arises from the inner 

 third of the upper border of the clavicle. As it passes upwards 



