[Verse 1]
From the heart's left ventricle, the aortic arch ascends
Curves leftward like a shepherd's crook, where normal pathways bend
Above the left main bronchus, this crimson highway soars
Three branches sprout in sequence, like tributaries from the source
[Chorus]
Brachiocephalic first, then carotid left, subclavian's last
B-C-S, remember this, the branching pattern's vast
Mirror-imaged when it's right, the arch that curves away
From left to right it changes sides, disrupting normal's way
[Verse 2]
The brachiocephalic splits, innominate they say
Right carotid, right subclavian, dividing on its way
While left carotid stands alone, the second branch in line
Before subclavian finishes what nature has designed
[Chorus]
Brachiocephalic first, then carotid left, subclavian's last
B-C-S, remember this, the branching pattern's vast
Mirror-imaged when it's right, the arch that curves away
From left to right it changes sides, disrupting normal's way
[Bridge]
Descending thoracic aorta, hugging spine's left groove
But when the arch swings rightward, anatomy must move
Over right main bronchus now, the crimson river bends
A mirror world of vessels where the normal pattern ends
[Outro]
Three branches tell the story of how blood finds its course
Left arch or right arch matters for this cardiovascular source
B-C-S in perfect order, when the pathway's running true
Aortic arch anatomy, now forever part of you