183 



du cceur, e des Yeux, e que la plus part des modernes le mettent au 

 rang des animaux qui ont peu de sang."* 



The lingual arteries, which are derived from the carotids, are of 

 considerable magnitude (Fig. 2, 6, z.) They run before the pos- 

 terior cornua of the os hyoides as single trunks, and are soon sub- 

 divided into numerous small branches which ramify through the 

 erectile portion. Coagula of blood, together with the tortuosity of the 

 vessels, prevented the ingress of injection to their minute termina- 

 tions, though it passed sufficiently far, to show their general course 

 and distribution. 



Two large veins (Fig. 5, 6, x), which take their origin round 

 about the prehensile and erectile portions of the tongue, run along its 

 lower surface, and having arrived at the os-hyoides, where they are 

 very conspicuous, one passes on either side of the root of the style, 

 between it and the hyo-glossus muscle ; then it escapes between the 

 anterior and posterior cornua, and applies itself on the side of the 

 trachea (L). It next courses along the trachea, first overlapped by 

 the thyroid gland (r), then by the carotid artery (y^ and aorta (u), 

 and at length opens into a large sinus (v) connected with the cor- 

 responding auricle of the heart (t), by an orifice which is distinct 

 from that of the jugular vein, and a little to its inner side. I have 

 succeeded in injecting the lingual veins with quicksilver through a 

 pipe introduced where they lie on the trachea, and when distended 

 with this fluid they acquired a size fully equal to that given them in 

 the plate. The quicksilver ran into the tongue, and fiUing many of 

 the larger branches, produced an evident turgescence in tiie most 

 dependent part of the organ ; but the delicate vessels being unable 

 to support the increasing weight of fluid, it soon becomes extrava- 

 saled: sufficient however remained to show in a preparation the 



* See Mem. de I'Academie Royale des Sciences, T. 3me. Ire. partie, page 46. 



