STERNO-CLEIDOMASTOIDEUS. 



181 



below the clavicle, with the pectoralis major and deltoid ; in the neck 

 with the external jugular vein and deep cervical fascia ; on the face, 

 with the parotid gland, the masseter, the facial artery and vein, 

 the buccinator, the depressor anguli oris, and the depressor labii in- 

 ferioris. 



On raising the platysma throughout its whole extent, the sterno- 

 mastoid is brought into view. 



Fig. 85.* 





The STERNO-CLEIDO-MASTOID is the large oblique muscle of the neck, 

 and is situated between two layers of the deep cervical fascia. It 

 arises as implied in its name from the sternum and clavicle (xXu^ax), 

 and passes obliquely upwards and backwards to be inserted into the 



* The muscles of the anterior aspect of the neck ; on the left side the super- 

 ficial muscles are seen, and on the right the deep. 1. The posterior belly of 

 the digastricus muscle. 2. Its anterior belly. The aponeurotic pulley, through 

 which its tendon is seen passing, is attached to the body of the os hyoides 3. 

 4. The stylo-hyoideus muscle, transfixed by the posterior belly of the digastri- 

 cus. 5. The mylo-hyoideus. 6. The genio-hyoideus. 7- The tongue. 8. 

 The hyo-glossus. 9. The stylo-glossus. 10. The stylo-pharyngeus. 11. The 

 sterno-mastoid muscle. 12. Its sternal origin. 13. Its clavicular origin. 14. 

 The sterno-hyoid. 15 The sterno-thyroid of the right side. 16. The thyro- 

 hyoid. 17- The hyoid portion of the omo-hyoid. 18, 18. Its scapular por- 

 tion ; on the left side, the tendon of the muscle is seen to be bound down by a 

 portion of the deep cervical fascia. 19. The clavicular portion of the trapeziiis. 

 20. The scalenus anticus, of the right side. 21. The scalenus posticus. 



