. The anatomy of the domestic animals. Veterinary anatomy. 624 BLOOD-VASCULAR SYSTEM OF THE HORSE IIk' imtorior 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 triciispidalis); of the three large cusps of this valve, one is between tlie atrio-ventricular opening and the conus arteriosus, one is septal, and the third is on tlie right margin. Small intermediate cusps
. The anatomy of the domestic animals. Veterinary anatomy. 624 BLOOD-VASCULAR SYSTEM OF THE HORSE IIk' imtorior 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 triciispidalis); of the three large cusps of this valve, one is between tlie atrio-ventricular opening and the conus arteriosus, one is septal, and the third is on tlie 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- dineie. The auricular surfaces are smooth. The ventricular surfaces are rough and furnish attachment to interlacing branches of the chordae tendineae. The valves arc folds of the endocardium, strengthened by fibrous tissue and at the jjcriphery Musculi pedinati Piilmdiuiry Crrnl rnrmianj ^ Lrft roro„anj _ Bi'ciisjiid I'lth't— " Cli'inlir lniiliia(r Papillnr!,_ Muxcidi iHciiimti. ~~Rli/lil i-iirnnary ? arUry ~^ Trnhirulir cantar Fig. —Section of Heart of Horse. Specimen in situ. The sorlinn ia cut iiuarl.\ :it riRhl angles to the ventrkuhir septum, .ind is viewed from tlie right and posteriorly. by nniscuhir fibers also. The chordae tendineae are attached below to the three musculi papillares, which project from tlie 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 chords tendineae from two papillary- nuiscles. Of the latter, two are on the s(>ptum and the tliird and largest springs from the anterior wall. The pulmonary orifice (Ostium jiulmonale) is cirrular and is situated at the simuni
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
