228 



HEAD AND NECK 



bisecting the floor of the triangle, in the median plane, is the 

 fibrous raphe into which these muscles are inserted. Not 

 infrequently the medial margins of the digastric muscles send 

 decussating fibres across the interval. Within the submental 

 triangle are the submental glands, which receive lymph from 



Platysma 



nterior facial vein : 

 Mylo-hyoid 



muscle" 

 Common facial 



vein 



Lingual vein 



>mall occipital N. 



Ireat auricular N.-- 



Nervus 



cutaneus colli" 

 :ernal j ugular vein ~ 

 Descending 

 cervical"j 



nerves 

 Brachial. 

 plexus 

 External, 

 jugular vein 

 Descendens 

 hypoglossi 

 Anterior 

 jugular vein 



Inferio 

 thyreoid vein 



External maxillary 

 artery 



Parotid gland 

 Submental lymph 

 gland 

 Submaxillary gland 



Sterno-mastoid arter 

 Ext. carotid artery 



Sup. thyreoid arter} 

 Common carotid 

 artery 

 Lymph gland 



Thyreo-glossal duct 

 Omo-hyoid 



Crico-thyreoid 

 Sterno-hyoid 



Isthmus of thyreoid 

 gland 



;rno-thyreoid 



FIG. 93. Dissection of the Front of the Neck. The Right Sterno-mastoid 

 has been removed. 



the median part of the lower lip and chin and the anterior 

 part of the tongue. 



In the median area of the infra-hyoid part there is a 

 narrow intermuscular interval, bounded on each side, above, 

 by the medial margins of the sterno-hyoid muscles, and to a 

 smaller extent, below, by the medial margins of the sterno- 

 thyreoid muscles (Fig. 93); more laterally lie the anterior bellies 



