THE VESSELS. 337 



basis ventriculi upwards in the anterior longitudinal groove ; then leaves its 

 art. coron. sinistra, turns in the left transverse groove at a right angle to the 

 left, and opens at the posterior inferior surface into the right auricle, close to 

 the septum atriorum, covered by valvul. Thebesii. Branches : from the walls 

 of the ventricles and the septum; it receives besides : 



a. F. cordis media s. Galeni s. posterior, passes in the posterior longitudinal 

 sulcus from the apex as far as the transverse, and opens in a wide place 

 shortly before the orifice of F. magna. 



b. F. coronoria dextra, passes from the left border of the heart in the trans- 

 verse groove to the right, and opens shortly before the orifice of F. 

 magna. 



2. Vv. minores cordis, 3 to 4 small veins on the anterior surface of the 

 right ventricle of the heart, open into the right auricle ; below it frequently 

 v. coronaria dextra. Vv. and foramina Thebesii do not exist farther. 



590. B. Cava superior s. descendens, the superior or 

 descending cava, 



corresponds to the arcus aorta and the aorta tkoracica ; arises in 

 consequence of the association of anonyma dextra and sinistra 

 close behind the cartilage of the second right rib, one inch from the 

 middle line of the body. Course : downwards on the right side of 

 the sternum, from before to behind and from left to right to the 

 superior part of the right auricle. Position : the superior portion ; 

 on the inner side of the right lung (the right anterior mediastina) 

 and the 2V. phrenicus dexter ; it lies to the left on the art. anonyma 

 and arcus aorfae, behind gland, thymus, before (lymphatic glands 

 and) trachea. The inferior portion inside the pericardium (one to 

 one inch and a half long), close before : bronchus. Art. and Ven. 

 pulmonalis (super.) dextr. ; touches on the left aorta ascendens, is 

 free to the right. V. cava sup. possesses no valves, and therefore 

 pulsates. Length : three inches. Breadth, at the mouth, two 

 inches. Sometimes two Vv. cc. supp. are present. Branches : 

 V. anonyma dextra, sinistra and F. azygos. 



591. 1. Vena anonymce dextra et sinistra [s. Brachio- 

 cephalicd]. 



They correspond on the one side to truncus anonymus, on the 

 other to carotis and art. subclavia. Origin : behind the articulatio 

 sterno-clavicularis and from the junction of the Ven.jugularis in- 

 terna and subclavia. Without valves. 



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