Blood Supply Of The Heart

Question 1

Describe course of right coronary art

Answer 1

1. Runs forwards between pulmonary trunk & right auricle
2. Passes downwards in ant border of coronary groove till inf border
3. Then turns left to post part of coronary groove where it ends by anastomosing with circumflex branch of rt coronary

Question 2

Mention branches of right coronary artery

Answer 2

1. SA nodal artery (65%)
2. Right conus artery
3. Right marginal artery
4. Atrial & ventricular branches
5. Post IV artery

Question 3

Mention structures supplied by post IV art

Answer 3

AV node (80%)
Adjacent parts of both ventricles but not apical parts
Post 1/3 of iv septum

Question 4

Describe course of left coronary artery

Answer 4

Passes behind pulmonary trunk, between it & left auricle, when it reaches the coronary groove it gives anterior interventricular artery & circumflex artery.

Question 5

Vein accompanying PD artery & the one accompanying LAD

Answer 5

Middle cardiac vein

Great cardiac vein

Question 6

Mention parts if heart supplied by LAD

Answer 6

1. Infundibulum & adjacent parts of lt ventricle by left conus
2. Adajacent oarts of both ventricles
3. Ant 2/3 of IV septum

Question 7

Mention branches of circuflex artery

Answer 7

1. SA nodal artery (35%)
2. AV nodal branch (20%)
3. Atrial & ventricular branches
4. Left marginal artery
   Ends by anastomsing with circuflex artery

Question 8

The left bundle branch is supplied by ….., while right bundle branch is mainly supplied by …..

Answer 8

Right & left coronaries

Left coronary

Question 9

Compare different variants of coronary arteries

Answer 9

Right dominance (Post IV art is branch of right cironary)
Left dominance (Post IV art is branch of left coronary)
Codominance (branches from right & left coronaries have a course in or near post IV groove)

Question 10

Clinical application of:

Coronary arteries are functional end arteries

Answer 10

The anastomisis is usually not large enough to provide an adequate blood supply to the cardiac muscle should one of the large branches become blocked by disease

Question 11

Enumerate veins draining heart

Answer 11

1. Coronary sinus
2. Anterior cardiac veins
3. Venae cordis minimae

Question 12

Describe course of coronary sinus

Answer 12

Short wide venous channel runs from left to right in post part of coronary sinus, it open into right atrium just left to opening of IVC
Its opening is guarded by small valve

Question 13

Mention tributaries of coronary sinus

Answer 13

Great, middle & small cardiac veins
Oblique vein of left atrium
Post vein of right atrium

Question 14

The great cardiac vein recieves ….., while small cardiac vein recieves ….

Answer 14

Right marginal vein

Left marginal vein

Question 15

The small cardiac vein is accompanying ….

Answer 15

Right coronary artery

Question 16

Great c.v. opens in coronary sinus at …. End, while small cardiac vein opens at …. End

Answer 16

Left

Right

Question 17

Describe the anterior cardiac veins

Answer 17

2-5 small veins which ascend on wall of right ventricle & open into right atrium

Question 18

Minute veins that begin in myocadium of heart & open directly into chambers

Answer 18

Venase cordis minimi

Question 19

Describe lymphatic drainage of heart

Answer 19

Subendocardial, myocardial & subepicardial plexuses drain heart. The first two drain in latter. The subendocardial plexus drain into right & left cardiac collecting trunks which run in coronary sulcus. Right trunk ends in brachiocephalic LN, left trunk ends in inf tracheobronchial LN.