©2020 by The Goofy Anatomist

5.4. Additional Notes and Revision Tips
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Additional Notes

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The internal thoracic veins run close to the internal thoracic arteries. However, remember that the veins run in the opposite direction to the arteries. Actually, the internal thoracic veins are draining the anterior intercostal veins. Musculophrenic and superior epigastric veins also exist. The internal thoracic veins drain into the left or right brachiocephalic vein as appropriate. (The brachiocephalic veins can be seen as the venous opposite to the arterial subclavians!)

Revision Tips

Sort out the azygous and hemiazygous veins in your head
At first glance, this is mega confusing. So take some time to learn the venous network. The azygous is on the right. The superior and inferior hemiazygous veins are on the left (see the diagram in the previous section).

Remember the brachiocephalic veins...
The LLLLLEFT brachiocephalic vein is so much LLLLLONGER than the right.

What about the jugular veins?
The internal jugular veins drain the brain, whilst the external jugular veins drain more superficial structures (e.g. face, scalp, temporal region).

Summarising the venous network...
On the LEFT side, the posterior intercostal veins drain as follows...

1st = Supreme intercostal vein
2nd - 4th = Superior intercostal vein
5th - 8th = Superior hemiazygous vein
9th - 11th + subcostal = Inferior hemiazygous vein

On the RIGHT side, the posterior intercostal veins drain as follows:

1st = Supreme intercostal vein
2nd - 4th = Superior intercostal vein
5th - 11th + subcostal vein = Azygous vein