Thoracic Cavity III: Heart And Great Vessels

Question 1

The Heart is Located in the _________ w/in the ______.

Answer 1

• Middle INF Mediastinum

- Pericardial cavity

Question 2

Parietal Pericardium

Answer 2

• Serous membrane
• fused to fibrous pericardium
• fused with the central tendon of Diaphragm
• fused to sternum

Question 3

T/F: The blood that supples the Pericardium supplies the Heart itself.

Answer 3

False

Question 4

Nerve supply to the Pericardium

Answer 4

1. CN X (Vagus)
2. Phrenic nerve
3. Sympathetic trunk

Question 5

Position of the Apex of the Heart

Answer 5

Down and to the Left

Question 6

The Base of the Heart is ____ to the apex.

Answer 6

Superior

“Think upside down triangle”

Question 7

The pericardium extends to the ______.

Answer 7

Sternal Angle

Question 8

Layers of the heart

Answer 8

1. External
2. Middle
3. Inner

Question 9

EXTERNAL Layer of the Heart

Answer 9

Aka Epicardium

• Visceral layers and CT

Question 10

MIDDLE Layer of the Heart

Answer 10

AKA Myocardium

• Thickest
• Cardiac Muscle tissue

Question 11

INNER Layer of the Heart

Answer 11

AKA Endocardium

• Endothelium

Question 12

Annuli fibrosi

Answer 12

• 4 interlocking fibrous rings
  (Cardiac skeleton)
• Interconnected w/ membranous portion of inter-ventricular septum

Question 13

Fxn of the annuli fibrosi

Answer 13

• rigid attachment for cardiac muscle fibers

- Support for VALVES

Question 14

The diaphragmatic surface of the Heart that rests on the diagram is what part?

Answer 14

• Mostly the left ventricle

- Part of the right

Question 15

Sternocostal surface of the external heart.

Answer 15

• Faces anteriorly

- Mostly RIGHT Ventricle

Question 16

Blood Supply to the heart

Answer 16

2 coronary arteries

• direct and ONLY branches off the ASCENDING AORTA

Question 17

Right Coronary Artery Supplies what?

Answer 17

• RA
• RV
• POST Half of Interventricular septum

Question 18

Right coronary artery branches off to where?

Answer 18

• SA node
• AV node
• POST descending artery

Question 19

Left Coronary artery supplies what?

Answer 19

• LA
• LV
• ANTERIOR half of the Interventricular artery

Think “LA”

Question 20

Left coronary artery branches off to where?

Answer 20

• Left descending artery
  (LAD)
• Circumflex artery
• Left Marginal artery

Question 21

Venous drainage from the heart

Answer 21

Opens into the RIGHT Atrium

Question 22

The Right Atrium receives blood from where?

Answer 22

4 places

1. SUP. Vena Cava
2. INF. Vena Cava
3. Coronary Sinus
4. ANT Cardiac Veins

Question 23

T/F: The Left Atrium is SMALLER than the Right Atrium?

Answer 23

True

Question 24

T/F: The Right side of the Heart is THICKER than the Left side.

Answer 24

False

The LEFT side is thicker

Question 25

Left Ventricle

Answer 25

• Wall 2-3x thicker than RV
• NO moderator band
• 2 Large papillary muscle

Question 26

Are there any Nervous Tissue in the heart?

Answer 26

NO

Question 27

Interventricular Bundle

Answer 27

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

Question 28

Where does the Descending Aorta end?

Answer 28

In front of Thoracic Vertebra 12

Question 29

The LEFT Brachiocephalic Vein is formed from what?

Answer 29

• The Left Internal Jugular

- The Left Subclavian

Question 30

The RIGHT Brachiocephalic Vein is formed from what?

Answer 30

• The Right Internal Jugular

- The Right Subclavian

Question 31

Sup Vena Cava is formed from what?

Answer 31

The Right and Left Brachiocephalic veins

Question 32

How is the Venous system developed in uterine?

Answer 32

Under LOW Pressure

Question 33

Azygos Vein forms in abdomen from what?

Answer 33

• RIGHT Subcostal Vein

- Right Ascending Lumbar vein

Question 34

Hemiazygos Vein forms in abdomen from what?

Answer 34

• Left Subcostal vein

- Left Ascending Lumbar vein