Thoracic Cavity III: Heart And Great Vessels Flashcards
The Heart is Located in the _________ w/in the ______.
- Middle INF Mediastinum
- Pericardial cavity
Parietal Pericardium
- Serous membrane
- fused to fibrous pericardium
- fused with the central tendon of Diaphragm
- fused to sternum
T/F: The blood that supples the Pericardium supplies the Heart itself.
False
Nerve supply to the Pericardium
- CN X (Vagus)
- Phrenic nerve
- Sympathetic trunk
Position of the Apex of the Heart
Down and to the Left
The Base of the Heart is ____ to the apex.
Superior
“Think upside down triangle”
The pericardium extends to the ______.
Sternal Angle
Layers of the heart
- External
- Middle
- Inner
EXTERNAL Layer of the Heart
Aka Epicardium
- Visceral layers and CT
MIDDLE Layer of the Heart
AKA Myocardium
- Thickest
- Cardiac Muscle tissue
INNER Layer of the Heart
AKA Endocardium
- Endothelium
Annuli fibrosi
- 4 interlocking fibrous rings
(Cardiac skeleton) - Interconnected w/ membranous portion of inter-ventricular septum
Fxn of the annuli fibrosi
- rigid attachment for cardiac muscle fibers
- Support for VALVES
The diaphragmatic surface of the Heart that rests on the diagram is what part?
- Mostly the left ventricle
- Part of the right
Sternocostal surface of the external heart.
- Faces anteriorly
- Mostly RIGHT Ventricle
Blood Supply to the heart
2 coronary arteries
- direct and ONLY branches off the ASCENDING AORTA
Right Coronary Artery Supplies what?
- RA
- RV
- POST Half of Interventricular septum
Right coronary artery branches off to where?
- SA node
- AV node
- POST descending artery
Left Coronary artery supplies what?
- LA
- LV
- ANTERIOR half of the Interventricular artery
Think “LA”
Left coronary artery branches off to where?
- Left descending artery
(LAD) - Circumflex artery
- Left Marginal artery
Venous drainage from the heart
Opens into the RIGHT Atrium
The Right Atrium receives blood from where?
4 places
- SUP. Vena Cava
- INF. Vena Cava
- Coronary Sinus
- ANT Cardiac Veins
T/F: The Left Atrium is SMALLER than the Right Atrium?
True
T/F: The Right side of the Heart is THICKER than the Left side.
False
The LEFT side is thicker
Left Ventricle
- Wall 2-3x thicker than RV
- NO moderator band
- 2 Large papillary muscle
Are there any Nervous Tissue in the heart?
NO
Interventricular Bundle
AKA Bundle of His
- Descends through channel In Fibrous Skeleton
- ONLY connection b/w Myocardium of Atria and that of the Ventricles
- Divides into 2 bundles
1. Right Crus
2. Left Crus
Where does the Descending Aorta end?
In front of Thoracic Vertebra 12
The LEFT Brachiocephalic Vein is formed from what?
- The Left Internal Jugular
- The Left Subclavian
The RIGHT Brachiocephalic Vein is formed from what?
- The Right Internal Jugular
- The Right Subclavian
Sup Vena Cava is formed from what?
The Right and Left Brachiocephalic veins
How is the Venous system developed in uterine?
Under LOW Pressure
Azygos Vein forms in abdomen from what?
- RIGHT Subcostal Vein
- Right Ascending Lumbar vein
Hemiazygos Vein forms in abdomen from what?
- Left Subcostal vein
- Left Ascending Lumbar vein
