. On the anatomy of vertebrates [electronic resource] . Superficial ventricular fibres ; front view, clxxxvii 530 ANATOMY OF VERTEBRATES. 411 ficial layer gains in thickness as it approaches the apex, a, wherethe course of the fibres to the inner surface of the ventricles iswell expressed by the term whorl or ( vortex, fig. 411. Those from the fore-part of the heart, d, e,f, enter the apex posteriorly: those from the backpart of the heart, b, enter it an-teriorly, at a. The curved marginof the entering anterior fibres, c,is left entire in successive sectionsof the apex of the left ventricle,un
. On the anatomy of vertebrates [electronic resource] . Superficial ventricular fibres ; front view, clxxxvii 530 ANATOMY OF VERTEBRATES. 411 ficial layer gains in thickness as it approaches the apex, a, wherethe course of the fibres to the inner surface of the ventricles iswell expressed by the term whorl or ( vortex, fig. 411. Those from the fore-part of the heart, d, e,f, enter the apex posteriorly: those from the backpart of the heart, b, enter it an-teriorly, at a. The curved marginof the entering anterior fibres, c,is left entire in successive sectionsof the apex of the left ventricle,until that of the right ventricle isreached, when a more complex ar-rangement appears. Most of theentering fasciculi form the inner-most layer of almost longitudinalfibres of the ventricular cavities;others are continued into thetrabecular and mammillary pro-cesses. By reflecting the superficial layer to its attachments or points. Apica! or vortical fibres, Human heart. CLXXXYII. of inflection at the apex,second layer is exposed; 412 and which at the base, b, fig. 412, theis partly formed by fibresascending from the interiorof the right ventricle, Cacc,emerging at the posteriorcoronary tract, pet, andreceiving accessions fromthe aortic and auricularrings. The fibres of thislayer, d, take an oppositecourse from those of thefirst, b, c. A third layerrepeats the general disposi-tion of the superficial one ;but a larger proportion ofthe fibres serve a singleventricle, especially at theapex, crc. Many fibresof this layer are derived from, or are continued into, the middlelayer of the septum, from which, as at fig. 413, b, the layer hasbeen cut, and reflected, at a 2, CRC, exposing the distributionof the internal layers, about each ventricle exclusively, as at rvand /, fig. 413.
Size: 1425px × 1754px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubject, booksubjectbirds, booksubjectfishes
