Vasculature

A. Aortic arch 4 forms the proximal part of the right subclavian artery.

B. The 7th intersegmental artery forms the distal part of the right subclavian artery and the entire left subclavian artery.

C. The subclavian artery (right and left) continues into the limb bud as the axis artery, which ends in a terminal plexus near the tip of the limb bud.

Femoral Intraoseous Vasculature

At birth

Femoral Intraoseous Vasculature

Childhood

At birth

Childhood

D. The terminal plexus participates in the formation of the deep palmar arch and the superficial palmar arch.

E. Axis artery

1. This artery initially sprouts the posterior interosseous artery and the median artery (which is reduced to an unnamed vessel in the adult).

2. The axis artery later sprouts the radial artery and the ulnar artery.

3. The artery persists in the adult as the axillary artery, brachial artery, anterior interosseous artery, and deep palmar arch.

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