LOyGITUDIXAL SECTIOXS OF THE HEART. 



333 



carnese and some other slight irregularities, but not the reticulations 

 which exist in the right ventricle. The aorta springs from the base 

 of the ventricle close to the septum. 



A . cardicica 

 d.Q.xtra 



Sinas 

 Valsalvae 



Valva 

 se-miluinans 



Valva tr leas pis 



V&nin cuius 

 Sinister 



\JzntrituLa& 

 dext&r 



FtG. 93.— The Dorsal Pa.kt of the Heart, 



SEEN FROM THE VeNTRAL AsPECT ; X 1.5. 



Fig. 94. — A LongittjDI?ial Segiiext of 

 THE Heart, showing the Right Sinus 



OF VALSAIiVA and CARDIAC ArTERT ; 

 X 1.5. 



§ 891. Explanation of Fig. 93. — Longitudinal, clextro-sinistral section of the entire 

 heart, seen from tlie ventral surface. 



Preparation. — This was the heart of a very larore male (castrated) cat, a gift from 

 Messrs. Mel^in & Badger of Boston, Mass. From the same cat were taken the scapiila 

 and humeri, ribs and vertebr£e shown in Fig. 43-46, 50, 68-71. 



The heart was not injected or prepared in any special way, excepting lir.rdening in 

 alcohol upon cotton. Hence the cavities are small and the auricles corrugated. When 

 hard, it was divided l)y a longitudinal dextro-sinistral incision with a large shar]) scalpel. 

 The dorsal part is here represented ; the ventral part is a little the thicker. 



The special object of the preparation is to exhibit the relative positions and oonnections 

 of the four great cavities with the auriculo ventricular valves. In addition, there are 

 shown, (A) the entrance of the pracfita, which has been longitudinally divided ; (B) the 

 point of entrance or mouth of the poKtcnta, as a dark spot at the beginning of the word ; 

 (C) the aorta and pulmonary artery (A. plm.) ; both are transected, the former just at the 



