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Across 1. blood vessel; receives blood from right ventricle 6. vein that returns blood from heart wall to right atrium 7. left atrial ventricular valve; so named because of the number of its cusps 9. vein; returns blood from head & neck to heart 10. heart chamber with thickest walls 11. left atrial ventricular valve; so named because it resembles the hat of a church bishop 15. flaps that look like dog ears on surface of heart 16. valve at entrance to pulmonary trunk 17. pitted & ridged muscle in ventricles 18. blood vessel; accepts blood from left ventricle 20. also called septomarginal band 21. name of right atrioventricular valve 22. heart chamber; receives blood from lungs 23. blood vessels; return blood to left atrium 24. inferior tip of heart; points toward left hip 25. fetal structure; allows blood to by-pass lungs 26. heart chamber; pumps blood to lungs

Down 2. valve through which blood leaving the left ventricle passes 3. heart strings 4. remnant of ductus arteriosus 5. tic shaped muscles in ventricles 8. vein; returns blood from legs & abdomen to heart 12. first blood vessels to branch off aorta 13. flat top of heart; points toward right shoulder 14. heart chamber; receives blood from body 16. pulmonary trunk bifurcates into these 19. comb-like muscle in right atrium 21. number of cusps in each semilunar valve 27. number of cusps in mitral valve