THE HEAD AND NECK ioqq 



manubrium sterni. Posterior. — -The anterior border of the stemo- 

 cleido- mastoid muscle. Superior. — One half of the base of the 

 inferior maxilla, and a line drawn from the angle of that bone to 

 the mastoid process. The triangle is covered by the skin, super- 

 ficial cervical fascia, platysma myoides, and deep cer\'ical fascia. 

 Superficial to the deep fascia there are the following structures : 

 the anterior jugular vein, the ramifications of the superficial or 



Buccinator Muscle ^ 



Facial Artery — 

 Submental Artery _ 



Lingual Ar _.^ ^ 



Sup. Lar. jVrt. and Nerve 



Thyrohyoid Muscle , 



Superior Thyroid Artery 



Post. Belly of Omo-hyoid 1'- -f' 



Subclavian Artery -^- — ,- 



(third part) y^ 



4«» 



Transversa Facial Artery 



Superficial Tem- 



j I ^-'W^ ^^^ -^"^ 



i^'-^''{ ':' 1^^ Internal Maxillary 

 Artery 



^ ,_ (_ Posterior Auricular 



'- — '^^S^/J' Artery 



/'/> J^-r-^-:^- Occipital Artery 



'-^^^^4 Descendens Cervids 



JPlWT ^ ^'erve 



~ ""■ — J External Carotid 



Artery 



Stemo^leido-mastoid 



~. Trapezius 



.Transverse Cervi- 

 cal Artery 



. Supra.<;capular 

 Artery 



Fig. 447, — ^The Left Side of the Head and Neck. 

 (The Platysma Myoides has been removed). 



transverse cervical nerve, and the inframandibular branch of the 

 facial nerve. 



The anterior triangle is divided into three triangles by the anterior 

 belly of the omo-hyoid muscle inferiorly, and the two bellies of the 

 digastric muscle superiorly. The subdivisions from below upwards 

 are called muscular, carotid, and digastric or submaxillary. 



The muscular triangle (inferior carotid) is bounded anteriorly 

 by the middle line of the neck ; posteriorly by the anterior border 

 of the stemo-cleido-mastoid ; and superiorly by the anterior belly 

 of the omo-hyoid. 



