What is the origin of the posterior intercostal artery?

What is the origin of the posterior intercostal artery?

The first and second posterior intercostal arteries originate from the superior (supreme) intercostal artery, a branch of the costocervical trunk. Third to eleventh posterior intercostal arteries arise directly from the posterior surface of the thoracic aorta.

What are the posterior intercostal arteries?

The posterior intercostal arteries are branches of the superior intercostal artery (upper two spaces) and the descending aorta (lower nine spaces). They supply the chest wall, parietal pleura, and, through their dorsal branches, the skin and muscles of the back and the spine and its contents.

Where do the 1st and 5th to 8th posterior intercostal veins drain to?

The 1st posterior intercostal vein, supreme intercostal vein, drains into the brachiocephalic vein or the vertebral vein. The 2nd and 3rd (and often 4th) posterior intercostal veins drain into the superior intercostal vein.

How many posterior intercostal arteries are there?

There are 12 pairs of posterior intercostal arteries (PIA). The first two pairs originate via the supreme intercostal artery from the costocervical trunk of the subclavian artery and the lower nine (excluding the subcostal artery) are segmental dorsal branches of the descending aorta.

What is the source of the posterior intercostal artery of the first intercostal space?

supreme intercostal artery
The 1st and 2nd posterior intercostal arteries arise from the supreme intercostal artery, a branch of the costocervical trunk of the subclavian artery. The lower nine arteries are the aortic intercostals, so called because they arise from the back of the thoracic aorta.

Where is the first intercostal space?

The intercostal space (ICS) is the anatomic space between two ribs (Lat. costa). Since there are 12 ribs on each side, there are 11 intercostal spaces, each numbered for the rib superior to it….

Where does the first posterior intercostal vein drain?

vertebral vein
The posterior intercostal vein of the first space drains into vertebral vein or brachiocephalic vein of the same side.

Is the first intercostal space under the clavicle?

Anteriorly, the first rib cannot be palpated below the clavicle, but the first intercostal space may be felt above the second rib. The position of the second rib is a reliable landmark anteriorly for determining the position of other ribs: palpate down the manubrium to the manubrio-sternal junction.

Where is the 2nd intercostal space located?

From the angle of Louis, move your fingers to the right and you will feel a gap between the ribs. This gap is the 2nd Intercostal space.

What drains the first intercostal space?

supreme intercostal vein
The supreme intercostal vein drains the 1st intercostal space posteriorly opening into the vertebral or brachiocephalic veins.

What does the posterior intercostal vein drain into?

The posterior intercostal veins drain into the azygos vein (right side), and hemiazygos and accessory hemiazygos veins (left side). The latter two veins ultimately drain into the azygos vein. The azygos vein then drains into the superior vena cava.