. The anatomy of the domestic animals . Veterinary anatomy. 624 BLOOD-VASCULAR SYSTEJI OF THE HOHSE Ihe anterior part of the orifice is usually only about an inch or two (ca. 3-5 cm.) above the level of the ventral end of the first rib, while the posterior part is four or five inches (ca. 10-12 cm), higher than the sternal end of the fifth rib. It is guarded by the tricuspid valve (Valvula tricuspidalis); of th>3 three large cusps of this valve, one is between the atrio-ventricular opening and the conus arteriosus, one is septal, and the third is on the right margin. Small intermediate cusp
. The anatomy of the domestic animals . Veterinary anatomy. 624 BLOOD-VASCULAR SYSTEJI OF THE HOHSE Ihe anterior part of the orifice is usually only about an inch or two (ca. 3-5 cm.) above the level of the ventral end of the first rib, while the posterior part is four or five inches (ca. 10-12 cm), higher than the sternal end of the fifth rib. It is guarded by the tricuspid valve (Valvula tricuspidalis); of th>3 three large cusps of this valve, one is between the atrio-ventricular opening and the conus arteriosus, one is septal, and the third is on the right margin. Small intermediate cusps intervene between the large ones. The peripheral edges of the cusps are at- tached to the fibrous ring at the atrio-ventricular opening. The central edges are irregular and hang down into the ventricle; they give attachment to chordae ten- dineae. The auricular surfaces are smooth. The ventricular surfaces are rough and furnish attachment to interlacing branches of the chordae tendineae. The valves are folds of the endocardium, strengthened by fibrous tissue and at the periphery Musculi pedinati Pulmonary artery Aortic valve-^ Great coronary^ I vein Left coronary artery Bicuspid Dalve — Chorda' iendinecs ,-^—' Papillary muscle. Musculi pectinati V I '~~ Right coronary <, / artery "Tricuspid valve Papillary muscle ~*^ Traheriilfc carnece Fig. 548.—Section of Heart of Horse. Specimen Hardened in situ. The section is cut nearly at right angles to the ventricular septum, and is viewed from the right and posteriorly. by muscular fibers also. The chordae tendineae are attached below to the three musculi papillares, which project from the ventricular wall; superiorly they divide into branches which are inserted into the ventricular surfaces and the free edges of the valves. Each cusp of the valve receives chordae tendineae from two papillary muscles. Of the latter, two are on the septum and the third and largest springs from the anterior wall. The pulmonary orifice (Os
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