DISSECTION OF THR DOG 147 



maxillary veins, the external jugular crosses the surface of the sterno-cephaHc 

 muscle to assist the sabclavian in the formation of the innominate vein. 



The following tributaries join the jugular at different points in its course : 

 (1) Small veins from the skin ; (2) a large and a small communicating branch 

 from the cephahc vein of the arm ; (3) the companion vein of the ascending 

 cervical artery ; (4) the companion vein of the transverse scapular artery. 



7H. splenius 



iu accessortus 



r?. omo-transversarius - 

 m. eteido-mastoideus — 



m. hiventer cervicis 



m. complextts 



m. longissimus 

 / capitis 



m. longissimus 

 I cervicis 



Plexus brachialis 



n. thoracal 



'is longus 



serratus doTsalis 



m. sterno-cephalicics - -- 



n. vagiii et truncus 



sympathicus ~~ - 

 a. carotis — 



V. jugularis interna 

 V. jugularis externa 

 mm. sterno-hynideus et 

 sterno-thyreoideus 



a. axillUTis 



m. pectoratis superjicialis 



m. transversus costarum^ 



m. pectoralis profundus 

 m. ohUquus abdominis extermis 

 Fig. 55. — Dissection of the side of the neck and thorax. 



Very commonly the two last named unite to form an omo-cervical trunk 

 which, in its turn, joins the jugular. 



V. MAXiLLAHis EXTERNA. — The external maxillary vein drains the blood 

 from the face, the tongue, and the mandibular region. The main root is 

 formed by the common facial vein which will be found in the groove between 

 the masseter and digastric muscles. About the ventral border of the sub- 

 niaxiUary gland the facial vein receives the common trunk formed by the 

 union of the lingual and sublingual veins, and then changes its name to that of 

 external maxillary vein. 



l2 



