PHYSIOLOGY: PRACTICUM V: PLATE XIV. 

 1 1 HART OK THE SHREP, THE LEFT SIDE OPENED ; X .8. 



rijjlit auricle 

 pulmonary artery 



fat 

 -- lung 



1 



left pulmonary vein 



-fossa ovalis 



fat 

 coronary sinus 



bicuspid valve 



8 



it 



*_~ chorda tendinea 



columna carnea 



-ill 



From this preparation (2789) were removed the left walls of the left auricle and ventri- 

 cle, and of the pulmonary artery and coronary sinus. Most of the shading is too heavy. 



i, cut surface of FAT. 2, 4, mouths of RIGHT PULMONARY VEINS. 3, PARTITION 

 between them. 5, partition between the right and left pulmonary veins ; it is made too 

 narrow, while the cut edge of the farther wall is too thick. 6, 7, cut fat at AURICULO- 

 VENTRICULAR SULCUS and about CORONARY SINUS. 8, 9, branches of CARDIAC 

 (coronary) ARTERY. 10, ectal surface of LEFT VENTRICLE, n, apex of cavity of ven- 

 tricle. 12, thin apical part of wall. 13, depression between the MUSCULAR RIDGES. 

 14, notch indicating the existence of a considerable space behind (ventrad of ) that part of 

 the wall. 15, fat at base of ventricle. 1 6, muscular wall of ventricle. 17, ridge at junc- 

 tion of AURICLE and ventricle ; 18; 20, depressions between TRABECUL^E in appendical 

 part of auricle. 19, ectal surface of appendix. 21, part of ectal surface of PULMONARY 

 ARTERY. 22, place of division of pulmonary artery into the left branch, here seen con- 

 tinued for about i cm., and the right branch ; the shading is so heavy as to obscure the par- 

 tition between the two. 



Aside from the general relations of parts the special objects of this figure are as follows : 

 (a), to exhibit the great thickness of most of the left ventricular wall, (b), to show an 

 AURICULO-VENTRICULAR VALVE ; the TRICUSPIDS on the right side have the same 

 general character; the margin is held at the corners by the TENDINOUS CORDS attached 

 to the FLESHY COLUMNS, (c) to indicate the location of the FOSSA OVALIS, the thin 

 area of the INTER-AURICULAR SEPTUM which was open in the fetus as the FORAMEN 

 OVALE. (d) to designate the point of attachment of- the DUCTUS ARTERIOSUS, the 

 remnant of a free communication between the pulmonary artery and the AORTA in the 

 fetus ; it is a slight depression at the end of the line from the name pulmonary 

 artery. 



