THE ANTERIOR VENA CAVA. 



which supply the radicles of the jugular vein, but also those of the spinal dura 

 mater, although these empty themselves into other veins ; in order that we may 



Fig. 385. 



RADICLES AND COLLATERAL BRANCHES OF THE JUGULAR VEIN IN THE HORSE (EXTERNAL VIEW). 



M, Inferior maxilla ; A, buccinator ; Mo, superior molar gland ; Ma, masseter muscle (the greater 

 portion has been removed); R, elevator of the upper lip; S, Steno's duct; C, carotid artery; 0, 

 subscapulo-hyoideus muscle ; St, sterno-maxillaris muscle ; P, termination of the two previous 

 muscles. 1, Radicles of the facial vein ; 2, superior coronary vein ; 3, inferior coronary vein ; 

 4, 4, 4, facial vein; 5, alveolar vein; 6, 6, transverse facial vein communicating in front with 

 the facial vein ; 7, buccal vein ; 8, anterior auricular vein ; 9, masseteric vein ; 10, deep network 

 of the masseteric veins ; 11, maxillo-muscular vein ; 12, 12, jugular vein ; 13, posterior auricular 

 vein; 14, occipital vein and its various branches; 15, laryngeal vein. 



be able to consider, in their entirety, all the vessels of the nervous centres which 

 carry dark blood. 



