the heart

Question 1

branches of the right coronary artery

Answer 1

1. branch to SA node
2. conus arteriosus branch
3. atrial branches
4. ventricle branches
5. AV node
6. posterior interventricular
7. right marginal

Question 2

branches of the left coronary artery

Answer 2

left anterior descending —> diagonal branches

circumflex —–> left marginal branches

Question 3

contents of atrial myocardium

Answer 3

1. outer circular

2. inner longitudinal

Question 4

contents of ventricular myocardium

Answer 4

lower 1\3: inner+ outer
upper 2\3: outer spiral + middle circular + inner longitudinal.

** the outer spiral and inner longitudinal are connected in the vortex cordis.

Question 5

layers of the heart

Answer 5

parietal pericardium
(---pericardial cavity with serous fluid---)
epicardium (also visceral pericardium)
myocardium (the thickest layer) 
endocardium

Question 6

functions of the fibrous skeleton

Answer 6

1. electrical insulator between the atrium and venticles
2. 2 fibrous rings, anchors the cuspidal valves
3. musculature of the heart arises from the fibrous skeleton

Question 7

anastamoses of coronary arteries

Answer 7

1. at the Apex, between anterior and posterior interventricular branches.
2. in the coronary sulcus, between circumflex and RCA
3. within the septum, between septal branches of anterior + posterior interventricular branches.

Question 8

where is the coronary sinus begins?

Answer 8

at the junction of the Marshall’s vein and great cardiac vein.

Question 9

where is the middle cardiac vein?

Answer 9

starts at the apex and ascends in the posterior interventricular groove.

Question 10

where is the small cardiac vein?

Answer 10

at the right side, drains to the coronary sinus

Question 11

the anterior and least cardiac veins?

Answer 11

drain directly to the right atrium.

Question 12

what is found between the 2 semilunar valves?

Answer 12

conus tendon.

Question 13

situs cordis

Answer 13

apex - 5th intercostal space, 7-8 cm away from sternal margin.

left margin of coronary sulcus - 3rd rib, 3 cm away from sternum

right margin of coronary sulcus - 6th rib, 2cm away from right sternal margin.

SVC enters the right atrium - junction og 3rd cartilage and sternum (RT side)

Question 14

valves of right atrium?

Answer 14

Thebesian vakve (of coronary sinus
eustavhian valve (of IVC)

Question 15

what is the most important branch of the internal thoracic artery?

Answer 15

The pericardiaco-phrenic artery.

Question 16

what accompanies the pericardiacophrenich artery?

Answer 16

phrenic nerves

Question 17

where do the phrenic nerve come from?

Answer 17

C4

Question 18

where does the phrenic nerve descends?

Answer 18

between the parietal pericardium and parietal pleura.