A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . p to the auriculo-ventricular ring. Mall divides these superficialfibers into two groups, the superficial bulbospiral andthe superficial sinospiral fibers. Between the innerand outer layers thus formed, fibers with a moretransverse or circular direction are met (Fig. 727).Some of these, the deep bulbospiral fibers, encirclethe left ventricle and these are strongly arising from the posterior side of the left os-tium venosum pass transversely to ente
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . p to the auriculo-ventricular ring. Mall divides these superficialfibers into two groups, the superficial bulbospiral andthe superficial sinospiral fibers. Between the innerand outer layers thus formed, fibers with a moretransverse or circular direction are met (Fig. 727).Some of these, the deep bulbospiral fibers, encirclethe left ventricle and these are strongly arising from the posterior side of the left os-tium venosum pass transversely to enter the interiorof the right ventricle and then turn upward toward thebase. At the base of the heart some of the fibers ofthe bulbospiral system encircle the root of the aortaand the left ostium, while on the-right side the sino-spiral system forms circular loops round the conusarteriosus. A recent contribution of great importancein the physiologj of the heart is the discovery thattendinous tissue does not completely separate themusculature of the auricles and ventricles of mam-malian hearts. A band of modified cardiac muscle,. Fig. 728.—The Right .\uricle and Ventricle of a Calfs HeartExposed to Show the Course and Connections of the Auriculoven-tricular Bundle. (Keith and Flack, The Lancet, .\ugust 11,1906.)1, central cartilage exposed by dissection; 2, the main bundle; 3, au-ricular fibers from which the main bundle arises; 4, right septaldivision; 5, moderator band; 6, septal cusp of the tricuspid: theupper part of this cusp and the adjacent part of the infundibularcusp have been removed: 7, posterior group of the musculi papil-lares; 8, orifice of the coronary sinus; 9, so-called tutjercle ofLower above the orifice of the inferior vena cava (10); 11, orificeof the superior vena cava; 12, septal wall of the right auricle; \ of the right auricle; 14. septal wall of the infundlbulum;, beginning of the pulmonar>- artery; 16, apex of the right ven-tricle. known
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
