Quain's elements of anatomy . mposed of connective tissue with much elastic tissue, chiefly collected into a well developed network in the deeper layer (fig. 436, c). The subserous areolar tissue is continuous with the interstitial tissuebetween the fibres of the myocardium. In it run the vessels and nervesbefore dipping down into the muscular substance, and a system of lym-phatic vessels, connected with the lymphatic spaces of the myocardium,also occurs here. The vessels and nerves are generally imbedded in a K K 2 500 THE HEART. considerable amount of fat (fig. 436, e), which is especially c
Quain's elements of anatomy . mposed of connective tissue with much elastic tissue, chiefly collected into a well developed network in the deeper layer (fig. 436, c). The subserous areolar tissue is continuous with the interstitial tissuebetween the fibres of the myocardium. In it run the vessels and nervesbefore dipping down into the muscular substance, and a system of lym-phatic vessels, connected with the lymphatic spaces of the myocardium,also occurs here. The vessels and nerves are generally imbedded in a K K 2 500 THE HEART. considerable amount of fat (fig. 436, e), which is especially collectedin the furrows, but may in fat subjects extend as a layer covering thegreater part of the surface ; and may even be found in the largerinterspaces of the myocardium, and beneath the endocardium. The endocardium furnishes a lining to all the cavities of the heart,following the inequalities of the inner surface of the organ, and becoming-continuous at the venous and arterial orifices with the inner coat of the Fig. Fig. 437. — Section of a part op THE ENDOCARDIUM OF THE RIGHTAURICLE. a. Lining epithelium ; h, connectivetissue with fine elastic fibres ; c, layerwith coarser elastic fibres ; d, subendo-cardial connective tissue continuous, withthe intermuscular tissue of the myocar-dium ; h, muscular fibres of the myo-cardium ; m, plain muscular tissue inthe endocardium. respective veins and arteries. A layer of flattened epithelial cells coversand lines the inner surface (fig. 437, a), and beneath this the endo-cardium consists of connective tissue with a close network of elasticfibres often passing into fenestrated membrane. Plain muscular fibresare j)resent in some parts {m). The ordinary cardiac muscular fibresextend in many places close up to the endocardium, but in others areseparated from it by some amount of areolar tissue. In this tissue, fatis often met with, especially in fat subjects and in fatted animals. Inthe heart of some animals, as the sheep, large
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