7 he Neck. 473 



gions of the mouth, the interior of the cranium, the 

 pharynx, nose, oesophagus, larynx, etc. 



Triangles of the Neck. The posterior common 

 triangle is divided into two triangles, by the posterior belly 

 of the omo-hyoid, viz., into an upper occipital and a 

 lower subclavian. The anterior common triangle, sepa- 

 rated from the posterior by the sterno-mastoid muscle, is 

 divided, by the anterior belly of the omo-hyoid and the 

 posterior belly of the digastric, into three smaller tri- 

 angles, viz., the submaxillary, the superior carotid, and 

 the inferior carotid. 



The principal contents of 'the occipital triangle 

 which is bounded, in front, by the sterno-mastoid ; behind, 

 by the trapezius, and, below, by the posterior belly of the 

 digastric, are: The spinal accessory nerve, the cervical 

 and a portion of the brachial plexuses of nerves, the pos- 

 terior cervical lymphatic glands, and the transverse cervi- 

 cal artery and vein. 



The subclavian triangle, bounded, in front, by 

 the sterno-mastoid; above, by the posterior belly of the 

 omo-hyoid, and, below, by the clavicle, contains the supra- 

 scapular and the transverse cervical arteries and veins, 

 the external jugular vein, subclavian artery, subclavian 

 vein and the brachial plexus of nerves. 



The submaxillary, bounded, above, by the jaw ; be- 

 low, by the posterior belly of the digastric, and in front, 

 by the median line, contains the parotid and the submax- 

 illary glands, the external cartoid and its branches, the 

 internal carotid artery and the internal jugular vein, the 

 pneumogastric, glosso-pharyngeal, hypo-glossal and sym- 

 pathetic nerves and lymphatic glands. 



The superior carotid triangle, bounded, above, 

 by the posterior belly of the digastric; behind, by the 

 anterior border of the sterno-mastoid, and, below, by the 



