ANATOMY
43
Thorax – Circulation
4.
Regarding the right coronary artery p156NM
a.
course through the left auricle and infundibulum
F - this is the LCA. The RCA goes between the R aortic sinus and pulm trunk.
RCA gives arises from the R aortic sinus of the ascending aorta and
passes to the R side of the pulm trunk running in the coronary groove.
The L goes between the L auricle and the pulmonary trunk.
b.
supplies 60% of AV nodes
F - Says 80% in Moore (via posterior IV artery)
c.
usually has a posterior interventricular branch
T - the artery which gives off the Post interventricular branch is the
dominant branch. This occurs from the R in 67% of people
d.
supplies 30% of SA nodes
F - Says 60% in Moores
e.
50% of AV nodes are supplied by the RCA
F - 80%
f.
50% of SA nodes are supplied by the RCA
F - 60%
g.
arises from posterior sinus
F - from R sinus
h.
wrong course
Course is to R of pulmonary trunk, running in coronary groove
5.
Coronary arteries p156 NM, 196 Lasts
a.
The right arises from the posterior coronary sinus
F - R aortic sinus
b.
There are arteriolar anastomoses between the
terminations of the left and right coronary arteries
T - They are considered end-arteries although collaterals do occur…
c.
The left supplies the conducting system in the
majority of patients
F - RCA suppliesSA in 60%, AV in 80%
d.
right arises from the posterior coronary sinus
F - from the R coronary sinus
e.
left supplies the conducting system in most patients
F - Not best answer: It supplies the IVS but the AV node is 80% and SA node
is 60% of time by RCA (via the anterior interventricular)
f.
right supplies the posterior descending branch in
most patients
T
g.
there are no arteriolar anastomoses between left and right F
6.
Regarding Internal Mammary artery p178 Lasts
(Ie the internal thoracic artery)
a.
Descends straight down 1cm medial to border off sternum F - 1cm lateral to border of sternum
b.
Branch of 2
nd
part of subclavian artery
F - 1
st
part
c.
Gives off two intercostal branches
F - Gives off two anterior intercostals at EACH intercostals space then
at the costal margin gives off superior epigastric and musculophrenic
d.
Runs with companion vein which drains into brachiocephalic T - x2 venae commitantes accompany it and drain into brachiocephalic vein.
Summary: Internal intercostals comes of the first branch of the subclavian artery
and descends 1cm lateral to the sterna border. It gives of two anterior
intercostals arteries at each intercostals space and splits into the superior
epigastric and musculophrenic arteries at the costal margin. It runs with x2
venae comitantes which drain into the brachiocephalic vein
