5.0 Gross anatomy of heart Flashcards
what does right and left side of pulmonary circuits do
right side: brings blood to the lungs
left side: bring bloog to the body
where is the heart located?
- in mediastinum
2/3 of left is to the left of midsternal line
- located posterior to sternum but anterior to vertebral column
- on superior face of diaphragm
what is the pericardium
- has 3 layers (usually just 2 i think)
- superficial fibrous pericardium:
- protects, anchord nd prevents overfilling
- considered the “extra” layer
- Deep two layered serous pericardium
- parietal layer of serous pericardium
- lines cavity
- Visceral layer of serous pericardium
- on heart
- aka epicardium
- parietal layer of serous pericardium
*Pericardial cavity is between the parietal and visceral layers of serous pericardium
what are the serosas of the body
- pericardium heart)
- pleura (in lungs)
peritoneum (abdomen)
what is the first layer of the heart wall
Epicardium aka visceral layer of serous pericardium
- often infiltrated with fat
most superficial layer of the heart
describe the second layer of the heart wall
what does it make up
- spiral bundles of cardiac muscle (spiral so when it contracts it squeezes the blood out)
- makes up fibrous skeleton of the heart: crisscrossing, interlacing layer of connective issue that
- > limits spread of AP to specific paths
- > anchors cardiac muscle fibers
- > supports great vessels & valves (pathways into and out of heart)
what is the innermost layer of the heart wall
endocardium: continuous with endothelium that lines vessels
- made of simple squamous epithelium
*lines inside of heart (all chambers)
Which layer of the heart wall consumes the most muscle
myocardium
How is the heart orientated
- Base
- at top
- is posterior and directed towards right shoulder
- mainly located in left atrium
- Apex
- bottom part
- points twds left hip
- points inferiorly towards left hip
superficial anatomy of atria
*atria are receiving chambers
- Coronary sulcus (atrioventricular groove): encircles junction of atria and ventricles (aka separates atria from ventricles)
- Auricles increase atrial volume: closet of heart, gives more room for blood
describe the internal anatomy of the atria
- interatrial septum: separates left/right atria
Pectinate muscles: muscles ridges that lines walls of aria
Fossa Ovalis: fetal remnant of foramen ovale (in fetal circulation blood goes from L->R atrium, skips lungs)
What are the receiving chambers in the atria
- Vessels entering right atrium (3)
- coronary sinus (blood ocming back from heart itself)
- inferior vena cava (blood from inferior of diaphragm
- superior vena cava
- Vessels entering left atrium (4)
- left superior and inferior pulmonary veins
- right superior and inferior pulmonary veins
*7 total
what separates the ventricles
interventricular septum (marked by interventricular sulci externally)
what lines the walls of the ventricles
trabeculae carneae
aka meat lattice
- ruffles on walls, made of myocardium
(all trabeculae carneae made of myocardium, but not all cyocardium is trabeculae carneae)
what are the discharging chambers of the ventricles
Vessel leaving right ventricle = pulmonary trunk
vessel leaving left ventricle = aorta