The heart is a muscular, four-chambered organ that is responsible for distributing blood throughout the body. The cardiac myocytes are organized in a syncitium so that the cells have an “open door” structure with each other. (40%). Heart-arterial supply, nerve supply, veins of heart. They are freely distributed both on the surface and in the substance of the heart, the separate nerve filaments being furnished with small ganglia. It is characterized by an intrinsic automaticity that ‘fires’ at a rate that is faster than other pacemakers and hence by this virtue becomes the impulse generator of the heart. The nerve supply to the heart is from two sets of nerves originating in the medulla of the brain. The cardiac nerves are autonomic nerves which supply the heart. It is formed by: Your email address will not be published. above the Aortic Valve, then subdivide into many smaller branches within the What are the components of conducting system of heart? The right atrium has been opened in this normal heart revealing the atrial septum and the fossa ovales and the annulus of the tricuspid valve The purpose is to demonstrate the triangle of Koch, which has its base in the coronary sinus, one limb along the Eustachian valve (ligament of Todaro) and the other along the tricuspid annulus. If you wish to opt out, please close your SlideShare account. The nerves that supply the heart are derived from the cardiac plexus, which are formed partly from the parasympathetic vagi and partly from the sympathetic trunks. 4. The sympathetic system causes an increase in cardiac rate, and contraction force, and causes the coronary arteries to become dilated by acting on the SA node, AV node, and directly on the atria and ventricles. The SA node lies on the subepicardial surface, on the sulcus terminalis, at the junction of the SVC with the RA (yellow sphere) on the sulcus terminalis  (yellow sphere), Courtesy Ashley DAvidoff MD copyright 2009 all rights reserved 06628cc03.8s, Sulcus terminalis on the Inside of the Heart, The anatomical specimen exhibits a right atrium that has been opened showing the SVC superiorly (superior royal blue ring), the inferior vena cava (blue ring inferiorly) with its associated Eustachian valve (purple), the entrance of the coronary sinus (small light blue ring) and the annulus of the tricuspid valve (teal ring). 14798d03.800 Davidoff Art Davidoff MD Copyright 2009. Nonidez has described that middle cardiac nerves supply efferent fibres to the heart; and superior cardiac nerves supply nerve to large arteries at the base of the heart, while the inferior cardiac nerves supply only afferent fibres to the heart. 33805SA Courtesy Ashley Davidoff MD. Cardiac branch of superior cervical ganglion of left sympathetic chain. Check the source ⇒ www.WritePaper.info ⇐ This site is really helped me out gave me relief from headaches. Cardiac branches of vagus a RLN except those forming superficial plexus. The myocytes have an “open door” structure meaning there are breaks in their cell membrane that allows for the optimal conduction and coordination of the nervous impulse enabling coordination of the muscular impulse. Coronary sinus develops from body & left horn of sinus venosus. 3. Optic Nerve (CN II) Oculomotor Nerve (CN III) Trochlear Nerve (CN IV) Trigeminal Nerve (CN V) Abducens Nerve (CN VI) Facial Nerve (CN VII) Vestibulocochlear Nerve (CN VIII) Glossopharyngeal Nerve (CN IX) Vagus Nerve (CN X) Accessory Nerve (CN XI) Hypoglossal Nerve (CN XII) Blood Vessels & CSF. Branch of anterior aortic sinus of ascending aorta. Autonomic Nerve Supply. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. In CODOMINANCE or BALANCED PATTERN, branches of both RCA & LCA run in the posterior interventricular groove. The LCA is overlaid in bright red, and the RCA in maroon. They include: Superior cardiac nerve (nervus cardiacus cervicalis superior); Middle cardiac nerve (nervus cardiacus cervicalis medius); Inferior cardiac nerve (nervus cardiacus inferior); The nerves go down to the root of the neck with these following association: This neuroanatomy article is a stub. BLOOD SUPPLY OF CONDUCTING SYSTEM OF THE HEART: Has both   i) motor  &  ii) sensory components. LEFT DOMINANT: in 10% cases, posterior interventricular artery is a branch of circumflex artery. CXR is from a 34 year old man with sarcoidosis. When the conduction system does not operate properly, the heart muscle contractions are uncoordinated and ineffective. The The right atriogram in the A-P projection reveals contrast in the SVC, IVC and right atrium (RA). 002 Case Study Chloroquin Related Cardiomyopathy, 003 Non Compaction Heart Failure and Pacemaker, 008 Mitral and Aortic Annular Calcification, 009 Dextrocardia MAC and Bacterial Endocarditis, 011 Calcific Pericarditis Post ASD repair, 012H Sarcoidosis Pericardium Myocardium and Lung, 013 Mixed Collagen Disorder Dilated Cardiomyopathy, 015 60M with Congenital Pulmonary Valve Stenosis, 016 57 M Sarcoid Cardiomyopathy Liver Disease, 017H Sarcoidosis, Heart Block, Resolution, 020H 34M CRF Dilated Cardiomyopathy Diabetes Pancreatitis, 022H Asymmetric Hypertrophic Obstructive Cardiomyopathy, 025H Sickle Cell Disease CHF Auto Splenectomy Bone Disease, 026H SLE Pulmonary Hypertension Libman Sacks, 030H Interatrial Septal Lipoma Extending to SVC, 031H Sarcoidosis Atrial Fibrillation LV Infiltration Thickening, 039H Dilated Cardiomyopathy Triangular Heart, 047H Acute MI Left Main Occlusion Batwing CXR, 047H Enlarged Left Atrium with Bulging Atrial Septum, 051H Sickle Cell CHF and Pulmonary Hypertension, 053H MVP MR calcified valve Carpentier ring, 054H Scoliosis Difficult CXR Pulm HT and Septum Primum Bulge, 055H LV Pseudoaneurysm with Hemopericardium, 058H 64F LVH fat in septum pap neg coronary calcium, Anomalous origins of the Coronary Arteries, Arrhythmogenic Right Ventricular Dysplasia, ARVD, Calcification in the Left Atrium – LA Calcification, Cardiomyopathy, Restrictive Cardiomyopathy, RCM, Case 004 Non Compaction and Ischemic Heart Disease, Chest X-ray and Heart Failure, CXR and CHF, Chest X-ray Notes Scales and Music Frontal View, Chronic Myocardial Infarction, Chronic MI, Congestive Cardiomyopathy, Non Ischemic Congestive Cardiomyopathy, Coronary Arteries CT Left Anterior Descending, Coronary Arteries CT Right Coronary Artery, Coronary Artery Anatomy – CT – Anterior Septal Arteries, Coronary Artery Anatomy – CT – Conal Artery, Coronary Artery Anatomy – CT – Conal Artery from RCA – Arc of Vieussens, Coronary Artery Anatomy – CT – Diagonal Arteries, Coronary Artery Anatomy – CT – Posterior Descending Artery-PDA, Coronary Artery Anatomy – CT – SA Nodal Artery from RCA, Coronary Artery Anatomy – CT -Acute Marginal Artery, Coronary Artery Anatomy – CT -AV Nodal Artery, Coronary Artery Anatomy – CT- Posterior Left Ventricular Arteries, Coronary Artery Anatomy Injected Post Mortem, Coronary Artery Anatomy Injected with Barium X-ray Specimen, Coronary Artery Left Anterior Descending Artery, Coronary Artery Vasospasm Prinzmetal Angina, CXR and the Pulmonary Valve and Chest X-ray, Fat Infiltration in the Left Ventricle, LV, Heart Failure with Preserved Ejection Fraction – Diastolic Heart Failure, Hypertrophic Cardiomyopathy – Apical HCM, Hypertrophic Cardiomyopathy – Chloroquin HCM, Hypertrophic Cardiomyopathy, Concentric HCM, Interatrial Lipoma, Lipoma of the Atrial Septum, Kartagener’s Syndrome, Primary Ciliary Dyskinesia, Lecture CXR CT MRI and Chloroquine Cardiomyopathy, Left Ventricle – Ventricular Septal Bulge (VSB), Left Ventricle CT Functional Evaluation LV, Left Ventricle Hypertrophy Aortic Stenosis (LVH AS), Left Ventricle Hypertrophy with Hypertension (LVH), Left Ventricle Non Compaction, LV Non Compaction, LGE, Delayed Gadolinium, Mid Myocardial Septum Pattern, Notes Scales and Music – Axial Imaging of the Heart, Systemic Lupus Erythematosus and Heart Disease, SLE, Tricuspid Valve and Annulus Calcification.