PHYSIOLOGIC APPARATUS 7^3 



The conus.arteriosus is separated from the ventricle by three semilunar 

 valves The interior of the conus is traversed by a longitudinally disposed 

 membranous valve attached to its dorsal surface; the ventral edge is, however, 

 free The upper extremity of the conus passes into the bulbus aorta, from 

 which it is separated by a semilunar valve and the free extremity of the 

 longitudinal valve. From the bulbus aortae arise two arge branches, a 

 right and a left, each of which is subdivided by two longitudinal partitions 

 fnto three vessels, the carotid trunk, the aortic arch, and the pulmo-cutaneous 

 trunk (See Fig 377.) The carotid and aortic trunks communicate 

 Separately with The cavity of the bulbus, while the pulmo-cutaneous trunk 

 communicates with the conus arteriosus by a single orifice, just ^bdow the 

 free end of the longitudinal valve. After pursuing a short course these 



carotid trunks respectively 



organs of the body, ine iwo , at > pulmo-cutaneous 



- * e lung and a cutaneous 



branch which is distributed to the skin. therefore, as follows: 



The course of the blood through the heart cavils, tt ^.^ 

 The venous blood poured by the ^ "^ rf ht auric i e . While the 

 through the .sino : auricular foramen ^ the "^ auride is being filled 

 right auricle is being filled frojt ' *^OUK*> <<when the auricles contract, 

 by blood coming through the pulmonary veins corresponding 



which they do simultaneously ^^ each pa^ es its blooa ^ ^^^ ^ 



S -us arteriosus springs from 



