502 



BLOOD-VESSELS OF THE NECK. 



seen the larynx, the trachea, oesophagus, and thyroid 

 gland; on the outside, the internal jugular vein in the 

 same sheath with the artery; "behind, these vessels rest 

 upon the transverse processes of the cervical vertebra, the 

 longus colli, and rectus capitis anticus major muscles, the 



FIG. 153. 



37- 



4S 



inferior thyroid arteries, and the inferior laryngeal and 

 sympathetic nerves. The common carotids are also cov- 

 ered in front hy the common integuments, platysma my- 

 oides, and superficial fascia of the neck. 



FIG. 153 represents the Anterior Neck, showing its Blood-vessel, &c. &c. 

 1 Anterior bellies of the digastric muscle. 2 3 Mylo-hyoideus. 4 Hyo-glos- 

 sus. 5 Stylo-glossus. 6 Styloid process. 7 Bifurcation of external carotid 

 into internal maxillary and temporal. 8 Posterior auricular branch of the 

 facial nerve and artery. 9 Stylo-pharyngeus, and middle constrictor of the 

 pharynx. 11 Mastoid branch of external carotid. 12 Superior thyroid ar- 

 tery. 13 Thyro-hyoid membrane. 14 Thyro hyoid muscle. 15 15 Sterno- 

 Ihyroid. 16 Thyroid gland. 17 17 Omo-hyoid muscle. 18 18 Sterno hyoid. 

 19 Sterno-mastoid. 20 Upper attachment of the sterno-mastoid. 22 Obliquus 

 capitis-superior. 23 Complexus muscle. 24 Splenius capitis. 25 Levator 

 anguli scapulaj. 26 Scalenus posticus. a Scalenus medius. b Scalenus an- 



