. A text-book of physiology : for medical students and physicians . ayerslie corresponding deep layers of the bulbospiral and sinospiralsystems, which have a more transverse or circular course. Thedeep bulbospiral fibers (B S) encircle the left ventricle and end * Mall, The American Journal of Anatomy, 2, 211, 1911. 536 CIRCULATION OF BLOOD AND LYMPH. by way of the septum on the dorsal side of the aorta. Thesefibers in the developed heart make a strong circular system whosecontraction tends to diminish the lumen of the left the superficial sinospiral system lies the deep sinosp
. A text-book of physiology : for medical students and physicians . ayerslie corresponding deep layers of the bulbospiral and sinospiralsystems, which have a more transverse or circular course. Thedeep bulbospiral fibers (B S) encircle the left ventricle and end * Mall, The American Journal of Anatomy, 2, 211, 1911. 536 CIRCULATION OF BLOOD AND LYMPH. by way of the septum on the dorsal side of the aorta. Thesefibers in the developed heart make a strong circular system whosecontraction tends to diminish the lumen of the left the superficial sinospiral system lies the deep sinospiralsheet (S Sf), which arises from the posterior side of the left ostiumand passes transversely to enter the interior of the right ventricleand then turn upward toward the base. At the base of the heartsome of the fibers of the bulbospiral system pass circularly roundthe base of the aorta and the left ostium, and in the right ventriclesome of the sinospiral system form circular loops round the conusat the base of the pulmonary artery. As will be described below,. Fig. 223.—Posterior view of heart, somewhat to left, after the superficial sinospiral bandhas been removed to the posterior longitudinal sulcus: BS, deep bulbospiral band; BS, super-ficial bulbospiral band, A, B, and C are fibers belonging to this system and forming the posteriorhorn of the vortex; SS, superficial sinospiral band, D and E are fibers belonging to this systemand forming the anterior horn of the vortex; CLV, the circular band (bulbospiral system) roundthe left venous ostium (Mall). there is some physiological evidence to indicate that this lattergroup of circular fibers around the base of the pulmonary arteryand aorta are the last to enter into contraction in the systole of theventricle, as might be expected from their homology with themusculature of the bulbus arteriosus in the hearts of the lowervertebrates. The Auriculoventricular Bundle.—A matter of very greatphysiological interest in connection
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