THE LEFT VENTRICLE. 



363 



Fig. 315. VIEWS OP PARTS OF THE SBMILUNAR AND MITRAL VALVES, AS SEEN FROM WITHIN THE 



VENTRICLE. (Allen Thomson.) 



A, portion of the pulmonary artery and wall of the right ventricle with one entire segment and two 

 half segments of the valve : a, b, c, sinuses of Valsalva opposite the segments ; d, df, inner surface of 

 the ventricle ; 1, 2, curved attached border of the segments ; 3, corpus Arantii, at the middle of the 

 free border. 



B, portion of the aorta and wall of the left ventricle with one entire segment and two half segments 

 of the aortic valve, and the right or anterior segment of the mitral valve : a, b, c, sinuses of Valsalva 

 opposite the segments ; in a, and b, the apertures of the coronary arteries are seen ; d, d', the inner 

 surface of the wall of the ventricle ; 1, 2, and 3, as before ; e, e', the base of the anterior segment 

 of the mitral valve ; /, its apex ; between e, and e', and/, the attachment of the branched chordae 

 tendinese to the margin and outer surface of the valve-segment ; g, right, h, left papillary muscle : 

 the cut chordae tendinese are those which belong to the posterior segment and the small or intermediate 



Fig. 316. SECTION THROUGH ONE OF THE FLAPS OF THE AORTIC VALVE AND PART OF THE CORRESPONDING 



SINUS OF VALSALVA, WITH THE ADJOINING PART OF THE VENTRICULAR WALL. (V. Horsley.) f 



a, endocardium, prolonged over the valve ; >, subendocardial tissue ; c, fibrous tissue of the valve, 

 thickened at c' near the free edge ; d, section of the lunula ; e, section of the fibrous ring ; /, muscular 

 fibres of the ventricle attached to it ; g, loose areolar tissue at the base of the ventricle ; s. V., sinus 

 Valsalvae ; 1, 2, 3, inner, middle, and outer coats of the aorta. 



