LONGITUDINAL SECTIONS OF TSE BHABT. 



333 



carnese and some other slight irregularities, but not the reticulations 

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

 ot the ventricle close to the septum. 



A.carciiaca 

 cfextra 



5tnas 

 Va/salvfie 



Valva 

 se.rn\.i.u.na.ns 



Valva "trizuspis 



Veniri cuius 

 sLnister 



MintrituLus 



Fig. 93.— The Dorsal Part of the Heart, 

 seen from the ventral aspbct ; x 1.5. 



Fig. 94. — A Longitudinal Segment of 

 THE Heart, showing the Right Sinus 



OF VAIiSAliVA AND CARDIAC ArtERT ; 



xl.5. 



§ 891. Explanation of Fig. 93. — Longitudinal, dextro-ainistral section of the entire 

 heart, seen from the ventral surface. 



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

 Messrs. Meh'in & Badger of Boston, Mass. From the same cat were taken the scapula 

 and humeri, ribs and vertebrae shown in Fig. 43-46, 50, 68-71. . 



The heart was not injected or prepared in any special way, excepting hardening in 

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

 liard, it was divided by a longitudinal dextro-sinistral incision with a large sharp 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 auriculoventricular valves. In addition, there are 

 shown, (A) the entrance of the prmeai>a, which has been longitudinally divided ; (B) the 

 point of entrance or mouth of the postcma, 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 



