

THE NECK 113 



laterally towards the apex of the axilla, and so form the axillary 

 sheath. It will be seen from Fig. 36 that the prevertebral 

 fascia, after covering the floor of the posterior triangle, blends 

 with the fascia on the deep surface of the trapezius and reaches 

 the ligamentum nuchse. In this way it forms a complete layer 



Genio-hyoid 



Sublingual gland 



-Genio-glossus 

 jJ^S 



3\ fT-xV Mylo-hyoid 



Epiglottis 



Investing layer 



Lingual artery 

 Submaxillary gland 

 Hyo-glossus 

 Palatine tonsil 



Greater cornu of 

 hyoid bone 



Sterno-mastoid 



Carotid sheath 



Bucco- pharyngeal 

 fascia 



Sympathetic trunk 



Retro-pharyngeal 

 lymph gland 



SSM*J. ^fSf^^ Vertebral vesse,s 



Retro-pharyngeal 

 abscess 



Prevertebral fascia Trapezius 



FIG. 37. Transverse Section through the Neck of a Child, at the level of the 

 Third Cervical Vertebra, showing the arrangement of the Deep Cervical 

 and Bucco-pharyngeal fasciae. An abscess is shown in the retro- 

 pharyngeal space, originating in one of the lymph glands in that situation. 

 Its relation to the prevertebral fascia should be carefully noted. Cf. 

 Fig. 50. 



around the neck, but it lies on a deeper plane than the investing 

 layer. 



Pus arising from tuberculous disease of the upper cervical 

 vertebrae lies behind the prevertebral fascia (Fig. 36). It forms 

 a swelling on the posterior wall of the pharynx which causes 

 difficulty in swallowing and respiration. Owing to the strength 



8 



