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A MANUAL OF ANATOMY 



external and internal carotid arteries. This border also overlaps 

 slightly the lateral lobe of the thyroid body. The posterior border 

 forms the anterior boundary of the posterior triangle of the neck, 

 and along it there lie the following structures : the glandulse con- 

 catenate, the small occipital nerve, great auricular^ superficial 

 cervical, spinal portion of the spinal accessory, and the descend- 

 ing superficial branches of the cervical plexus of nerves, and a por- 

 tion of the external jugular vein. 



Stensen's Duct 



Buccinator Muscle ^ 



Facial Artery 

 Submental Artery 



Lingual Artery-^ 

 Sup. Lar. Art. and Nerve 



Thyro-hyoid Muscle -- 

 Superior Thyroid Artery 



Post. Belly of Onio-hyoid _ 



Subclavian Artery. «. 



(third part) 



Transverse Facial Artery 



Superficial Tem- 

 poral Artery 



Internal Maxillary 

 Artery 



/ Posterior Auricular 



Artery 

 '1/—^-. Occipital Artery 



II. Stylo-hyoid Muscle 



' Post. Belly of Digastric 



Hypoglossal Nerve 



-- Descendens Cervicis 

 Nerve 



External Carotid 



Artery 



Sterno-cleido-mastoid 



^Trapezius 



...Transverse Cervi- 

 cal Artery 

 Suprascapular 

 Artery 



Fig. 443.— The Left Side of the Head and Neck. 

 (The Platysma Myoides has been removed). 



The sterno-cleido-mastoid muscle, from its diagonal position upon 

 the side of the neck, divides the quadrilateral space into two 

 triangles— posterior and anterior. 



Posterior Triangle.— This is the region which lies behind the 

 sterno-cleido-mastoid muscle. 



Boundaries — Anterior. — ^The posterior border of the sterno- 

 cleido-mastoid. Posterior. — ^The anterior border of the trapezius. 

 Inferior (base).— The middle third of the clavicle. The apex is at 



