FIELDS H-1 and H-2 

 Columns 29, 30, 31, 

 32, 33, and 34 



3 IK Pulmonary valve 



315 Septum 



316 Endocardium 



317 Myocardium 



318 Pericardium 



319 Associated structures of the heart: alary muscles, suspensory ligaments; lateral vessels; 



diverticula of insect hearts, etc. 



31A Pacemaker. (For a single specifically named pace maker, use Symbols 3 1 B or 3 IC. Note 



also the structures 32M and 32N which affect cardiac pace. ) 



31B Atrioventricular node (= auriculoventricular node; AV node) 



31C Sinus node {= sinal node; sino-atrial node; sino-auricular node) 



3 ID Right auricle 



3 IE Left auricle 



3 IF Right ventricle 



31G Left ventricle 



31H Left auriculoventricular valve {= bicuspid valve or mitral valve) 



311 Right auriculoventricular valve (= tricuspid valve) 



31J Aortic valve (semilunar aortic valve) 



3 IK Pulmonary valve 



31 L Sinus venosus (more primitive vertebrates) 



32 Circulatory vessel, not otherwise specified. (For specific vessels or specific vessel 



types, use one of the symbols below. ) 



321 Aorta 



322 Pulmonary vessel, not otherwise specified. (For pulmonary artery or pulmonary vein, use 



Symbols 32F or 32G. ) 



32F Pulmonary artery 



32G Pulmonary vein 



323 Hepatic portal vein; hepatic portal system 

 321 Renal portal vein; renal portal system 



324 Systemic vessel (= circulatory vessels other than the heart). (For specific vessels or 



specific vessel types, use one of the symbols below. ) 



325 Artery; efferent blood vessel. (For specific arteries, use one of the arterial symbols below. ) 

 32F Pulmonary artery 



32D Coronary artery 



321 Aorta 



327 Arteriole 



326 Vein; afferent blood vessel. (For specific veins, use one of the symbols below. ) 

 32E Coronary vein 



32G Pulmonary vein 



32H Vena cava 



323 Hepatic portal vein 



321 Renal portal vein 



327 Arteriole 



328 Venule 



329 Capillary 



32A Lymphatic system. (For specific parts of the lymphatic system, use the symbols below. ) 



32B Lymphatic vessel 



344 Lymph node 



32C Coronary vessel 



32D Coronary artery 



32E Coronary vein 



32F Pulmonary artery 



32G Pulmonary vein 



32H Vena cava 



321 Renal portal vein 



32J Peripheral blood vessels (as opposed to visceral vascular bed) 



32K Visceral blood vessels (as opposed to peripheral vascular bed) 



32L Vessels of the extremities 



32M Carotid sinus 



32N Carotid body (= Carotid gland, intercarotid body, glomus caroticum) 



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