Great vessels of heart

Left coronary artery

– left posterior aortic sinus

- Gives off its anterior atrioventricular branch- ends by anastomosing with right coronary artery- Continuation to the lft, after giving off anterior atrioventricular branch, may be termed circum

flesx artery- Branches of left coronary artery

Right coronary artery

- From anterior aortic sinus- Passes forwards between root of pulmonary trunk and auricle of right atrium- Clinical anatomy = stenosis, narrowing of artery, hyperlipidemia, diabetic mellitus, hypertension,

may lead to myocardial infarction- Difference between angina and myocardial infarction

Nerves of heart = superficial cardiac plexus, deep cardiac plexus, symphatetic fibers, parasymphatetic fibers

Superficial cardiac plexus

- Present in front of ligamentum arteriosum, bifurficatyion of pulmonary trunk- Forms by 2 branches from left side = superior cervical branch of left symphatetic chain

Conducting system of th heart = sino-atrial node (S-A node), atrio-ventricular ndoe (A-V node)

Sino-atrial node

- Found in upper part of sulcus terminalis

Atrio-ventricular node

- Give off branch = right and left atrio-ventricular branch- Defect = insertion of pacemaker to maintain function of the valve