ZOOLOGY 



Fig. 34. Vertical Section of the Heart.* 



* Veiiou* 1 -;i\itics of the heart. 1. Interior of the right ventrit : 

 in- tin- llesliy columns strengthening its walls. ~1. Portion of tlu- ; 

 \alve, which, on rising up during the contraction of the wntricle, partially 

 closes the aperture Ica.lin^ int.i the auricle : tl,. 

 1 lie fine eii^es of the \al\' prevent it returning too far to\varl* tl:i- auriele, 



.loll- l.eint: attiK-heii )iy tlieir otln-r extremities to the !lr-li\ eoluinns 



ami tloliy walls of the \entriele. H. Ca\ity of the ri^'ht iiuriele. I. I'l.-hy 

 eoliiuin-. stren^'llu'llillL,' the \\alU of I lie ea\itv. ~i. Oriliee of 1 he i,'rOHt 

 eoroiiary vein re I tirniiig tin- !>lc.o.l from : lie heart ii-elf lo the 



i-;i\ity c.'fth,- auricle. ; > ali>, in the hot torn of which ma\ 



tli.- r.-niain-iof the ujx-nini,' ly which, in the fu-tus, the two auricles cominuiii- 

 <-at,-.l ilin-ctlv with ea.-h oth. : riOT. 1". Tnink 



ofthe inferior ca\.i. ll.Tli. !.'. \2. The {uiluionary 



