Textbook of normal histology: including an account of the development of the tissues and of the organs . n thevisceral, all the constituent layers beingbetter developed. The subpericardialtissue covering the heart is continuouswith the intermuscular connective tissueof the outer muscular layer; in this posi-tion numerous fat-cells lie between thebundles of the fibrous and the musculartissue. The blood-vessels supplying the muscleof the heart are derived as branches ofThe principal trunks are situated in thelarger interlamellar masses of connective tissue, within which theydivide into numerous
Textbook of normal histology: including an account of the development of the tissues and of the organs . n thevisceral, all the constituent layers beingbetter developed. The subpericardialtissue covering the heart is continuouswith the intermuscular connective tissueof the outer muscular layer; in this posi-tion numerous fat-cells lie between thebundles of the fibrous and the musculartissue. The blood-vessels supplying the muscleof the heart are derived as branches ofThe principal trunks are situated in thelarger interlamellar masses of connective tissue, within which theydivide into numerous twigs giving origin to the capillaries; thelatter penetrate the primary muscle-bundles, among and parallel towhich they run. The relation between the individual muscle-fibresand the capillaries is more intimate than usually supposed, since, asshown by Meigs, the blood-vessels deeply impress the fibres, andin many places are surrounded completely by the muscular extraordinary demands made upon the nutrition of the heart-tissue as the result of its remarkable functional activity explain the. Section of human heart, includingpericardium: a, endothelium ofpericardial surface; b, subendo-thelial fibrous tissue ; c, net-worksof elastic fibres ; d, subpericardialareolar tissue containing fat-cellsembedded between pericardium andmuscle (e) ; v, blood-vessel. the coronary arteries. THE CIRCULATORY SYSTEM. IO3 necessity for such close arrangement. The deeper fibrous layersof the pericardium and of the endocardium receive numerous capil-laries, a few being also found within the chordae tendineae and thevalves. The lymphatics of the heart are very numerous. They forma comprehensive system, embracing the lymph-spaces occupyingthe clefts between the muscle-fibres and the rich net-works ofmore definite channels extending within the pericardium and endo-cardium, including the valves. These two sets of lymph-radiclescommunicate but sparingly and pursue largely independent
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Keywords: ., bookauthorpiersolgeorgeageorgea, bookcentury1800, bookdecade1890
