So we leave that one side. So this is the subclavian.
The subclavian artery, that’s the scalene
muscle. Scalene muscle, so that is your first
part of subclavian. Behind it is the second
part of subclavian. And after that is the
third part of subclavian artery. Because of
the way the questions are structured, you
won’t be asked about the three parts or
what comes from the east part. That could
be for the part B. For the part A, all you
need to know is the branches. So the branches
of the subclavian artery, the
mnemonic, if you remember, is vitamin C and D.
These are branches of the subclavian. Vertebral artery,
internal mammary artery, thyrocervical
trunk, from thyrocervical trunk, you have
the inferior thyroid artery from here, then
the costocervical trunk and the dorsal scapular
artery. This is the vertebral, internal mammary
also called internal thoracic, thyrocervical
trunk, costocervical trunk, and dorsal scapular.
These is essentially your branches of subclavian.
Vertebral artery goes to the cervical vertebra,
enters the transversarium at C6, goes all
the way up to the brain, both sides anastomosis
to form the basilar, and then the circle of Willis.
Internal mammary, that’s internal
mammary. Just lateral of the external edge,
it goes down, and what happens to this?
The superior epigastric.
Very good, and?
I’m not sure.
Musculophrenic. So it divides into a musculophrenic
supplying the diaphragm and superior epigastric
supplying the rectus abdominis. Then you also
have some intercostal branches, going to the
ribs, coming from the internal mammary. In
females, the blood supply to the breast is
also coming from the medial side. It’s coming
from internal mammary. Thyrocervical trunk,
as the name says, thyrocervical. So it has
the inferior thyroid artery and some cervical
branches. Costocervical, these are the first,
the superior intercostal. the costocervical,
superior intercostal artery are the highest
intercostal artery, and finally, the dorsal
scapula. That’s all you need to know. You
don’t have to know anything beyond this.