THE HEAD AND NECK mi 



myoides ; superficial layer of the deep cervical fascia ; anterior 

 border of the stemo-cleido-mastoid ; stemo-hyoid ; stemo- thyroid ; 

 anterior belly of the omo-hyoid ; and the anterior wall of the carotid 

 sheath. Three veins cross the artery from without inwards, as 

 follows : the anterior jugular vein crosses it immediately above the 

 clavicle, superficial to the stemo-hyoid and stemo-thyroid muscles ; 

 the middle thyroid vein crosses it just below the level of the cricoid 



Socia Paroddis 



Stensen's Duct : 



Transveise Facial Artery 



Parotid Gland 



Mental Arter>- 



Facial Artery 

 Lingual Artery- 

 External Caroti'' Arterj-..- 

 Soperjor Laryngeal Artery _ / i \' \ 

 Superior Thyroid Artery. ^^I*.^ 



Pneumogastric Nerve I ' ' 

 Internal Jugular Vein 

 Common Carotid Artery 



Anterior Belly of Omo-fayoid 

 Ascending Cervical Artery 



Inferior Thyroid Artery ' __ 



^Saper6cial Temp oi al Artery 

 ^ Intercal Maxillary Artery 



Posterior Auriculai 



Artery 



lOcdpital Artery 



Great OcciiMta] 



Nerve 

 — Icteroal Carotid 



Artery 



k 



»De^ Cervical 

 Glands 



- Phrenic Nerve 



-Scalenus Anticus 



Muscle 

 -Transverse Cervical 

 Artery 



• \ 



Snbdavian Artery (first part) \ _ ^ , , 



\ rtnprascaiNilar Artery 



Thyroid Axis 



Fig. 453. — Deep Dissection of the Left Side of the 

 (after Spalteholz). 



Neck 



cartilage ; and the superior th5n-oid vein crosses it near its bifur- 

 cation. The stemo-cleido-mastoid branch of the superior thyroid 

 atrtery, which is of smaH size, passes obliquely downwards and 

 outwards over the carotid sheath in the carotid triangle. The 

 descendens cervicis nerve descends upon, or it may be within, the 

 carotid sheath, lying directly over the artery, and the ansa cer\^icis 

 (hypoglossi) lies upon the sheath. 



Posterior. — The posterior wall of the carotid sheath ; the cervical 



