Unit5

layers of heart wall

epicardium

myocardium- composed of cardiac muscles

endocardium- composed of endothelium

superior vena cava

carries low oxygen blood from head, neck, chest, and upper limbs to the right atrium

inferior vena cava

carries low oxygen blood from abdomen and lower limbs to the right atrium

right atrium

right auricle

pectinate muscles

opening to the coronary sinus

fossa ovalis- fetal structure that shunts blood from right to left atrium

tricuspid valve- prevents backflow of blood into right atrium when right ventricle is in systole

right ventricle

trabeculae carneae

papilary muscle

chordae tendineae

interventricular septum

pulmonary trunk & R/L pulmonary arteries- carries oxygen poor blood to lungs

pulmonary semilunar valve- prevents backflow of blood into the right ventricle during ventricular distole

left atrium

2R & 2L pulmonary veins- carries oxygen rich blood from the lungs to the left atrium

left auricle

pectinate muscle

bicuspid valve- prevents backflow of blood into left atrium when the left ventricle is in systole

left ventricle

chordae tendineae

papillary muscle

trabeculae carneae

interventricular septum

ascending aorta- carries oxygen rich blood to all organs of body

aortic semilunar valve- prevents backflow of blood into left ventricle during ventricular distole

R & L coronary arteries

sulci of heart

coronary sulcus

anterior interventricular sulcus

posterior interventricular sulcus

coverings of the heart

pericardial sac

fibrous pericardium

parietal pericardium

visceral pericardium

pericardial cavity

serous fluid