228 



HEAD AND NECK 



three well-marked subdivisions, viz., two lobes joined across 

 the median plane by the isthmus. Each lobe is somewhat 

 conical in form ; its base lies at the level of the fifth or the 

 sixth tracheal ring, whilst its apex rests against the side of 

 the thyreoid cartilage. Its superficial or lateral surface is full 



\nterior facial vein 



M. mylohyoideus 



Common facial 

 vein 



Lingual vein 

 Lesser occipital N., 

 Great auricular N. 

 Nervus 

 cutaneus colli 

 iternal jugular vein 

 Descending 

 cervical ""} 

 nerves | 



BrachialV 

 plexus \ i 

 External---!-. 

 jugular vein ,| 

 Descendens m 

 hypoglossi 

 Anterior 

 jugular vein 



Inferior 

 thyreoid veins 



Platysma 



External maxillary 

 artery 

 BL_ Parotid gland 



Submental lymph 

 eland 



Submaxillary glanc 



Sterno-mastoid arte: 



Ext. carotid artery 



Sup. thyreoid arter 

 Common carotid 

 artery 

 Lymph gland 



Thyreo-glossal duci 

 M. omohyoideus 

 M. cricothyreoideu 

 M. sternohyoideus 



Isthmus of thyreoic 

 gland 



M. sternothyreoidei 



FIG. 82. Dissection of the Anterior Part of the Neck. 

 mastoid has been removed. 



The Right Sterno- 



and rounded ; it is covered superficially by the sterno- 

 thyreoid, sterno-hyoid, and omo-hyoid muscles, and is 

 overlapped by the anterior border of the sterno-mastoid 

 (Fig. 83, p. 230). Its deep or medial surface is adapted 

 to the parts upon which it lies, viz., to the side of the 

 trachea, the cricoid cartilage, and the thyreoid cartilage. 

 Its. posterior border is in relation with the lateral margins of 



