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MEDIASTINUM-Superior
Mnemonic: BATS & TENT B: Brachiocephalic veins A: Aortic Arch T: Thymus S: Superior vena cava & T: Trachea E: Esophagus N: Nerves Vagus Phrenic L. recurrent laryngeal T: Thoracic duct
Mediastinum-Inferior
Anterior Compartment
Mnemonic: LIT
L: Lymph nodes
I: Int. Thoracic vessels
T: Thymus (lower portion)
Mediastinum-Inferior
Middle Compartment
Mnemonic: (It's a) TRAHP T: Trachea (bifurcation and mainstem bronchi) R: Roots of great vessels 1. Superior/inferior vena cava 2. Pulmonary veins 3. Ascending aorta 4. Pulmonary trunk A: Arch of azygous vein H: Heart, coronary vessels, & pericardium P: Phrenic nerve
Mediastinum-Inferior
Posterior Compartment
Mnemonic: (I) L(o)V(e) DATES L: Lymph nodes V: Vagus nerve D: Descending aorta A: Azygous and hemizygous veins T: Thoracic duct E: Esophagus S: Splanchnic nerves (greater, lesser, and least)
4 Quadrants of abdomen
Upper Right
Liver
Upper Left
Spleen
Lower Right
Appendix, ascending colon
Lower Left
Descending colon, sigmoid colon, rectum
Conducting system
SA node- depolarizes spontaneously, and when it does it sends an electric signal to heart to contract. It is called the pace maker. Usually 60-100 times a minute hence normal heart rate. In right atrium
AV node- found in the floor of the right atrium, picks up electrical impulse from SA node and sends it to muscular fibers called bundle of his
Bundle of his- runs in the inter ventricular septum (wall that separates left and right ventricle) where it branches where it turns into two in the left ventricle branches (anteriosuperior left bundle branch and posterior left bundle branch) and one right ventricle branch (right bundle branch)
the bundle branches have perkinje fibers that come off of them. these fingerlike structures deliver the electrical impulse into the myocardium where it then contracts. This is mechanical contraction where it can then be pumped out to the lungs
Tricuspid valve
Found where in heart?
Best heard where?
Cusps?
Between R. atrium and R. ventricle
Best heard at L. 5th interspace
Cusps:
Anterior
Posterior
Medial
Bicuspid (mitral) valve
Between L ventricle and L atrium
Best heard at L. 5th interspace - midclavicular line
Cusps:
Anterior
Posterior
Pulmonic (R. semilunar) valve
Between R ventricle and Pulmonary a.
Best heard at L. 2nd interpsace
Cusps:
Left
Right
Anterior
Aortic (L. Semilunar) valve
Between?
Best heard where?
Cusps?
Between L. ventricle and aorta
Best heard at R. 2nd interspace
Cusps
Left
Right
Posterior
R atrium features
Fossa ovalis (btwn right and left atrium) Coronary sinus (where veins come together) SVC and IVC opening
R ventricle features
Conus arteriosus
what is the most posterior chamber of the heart?
the left atrium
left atrium features
Left AV orifice
Openings of pulmonary veins
Valve of foramen ovale
L ventricle features
thickest myocardium
Left AV orifice
blood flow of heart
superior vena cava receives blood from head, neck, upper limbs, and chest.
The inferior vena cava receives blood from the trunk, viscera, and lower limbs
both vena cava’s drain into the right atrium
What heart valves are open during diastole?
your mitral and tricuspid valves, blood is pouring through the atria into the ventricles
What heart valves are open during systole?
your pulmonic and aortic valves, because your heart is contracting. mitral and tricuspid must be closed to create pressure
blood flow with arrows
SVC/IVC → Right Atrium → Tricuspid Valve → Right Ventricle → Semilunar/Pulmonic valve → pulmonary arteries to lungs → pulmonary veins to heart → Left Atrium → Bicuspid Valve → Left Ventricle → Aortic Valve → Aorta
→ Brachiocephalic Trunk/ Left Common Carotid/ Left Subclavian/ Descending Aorta
pulmonary circulation
takes veins from the right ventricle to the lungs (right side of heart)
systemic circulation
from the left ventricle to the rest of the body (higher pressure than pulmonary)
coronary circulation purpose
to get oxygenated blood to the heart. Requires coronary (crown) arteries
coronary circulation of arteries
Left Coronary Artery: (comes off of ascending aorta, distal to aortic valve)
-Left Anterior Descending A (supplies left ventricle). → lat. left ventricular br. (secondary br) ((supplies left ventricle)
Circumflex (supplies most of left atrium) → diagonal br
Right Coronary Artery: (comes off of ascending aorta, distal to aortic valve)
Right Marginal A. (supplies the inferior surface of right ventricle)
Post. Descending A.