The wrist is extended as shown to bring the radial artery closer to the surface.
Reproduced with permission from: Torrey SB, Saladino RA. Arterial puncture and catheterization. In: Textbook of Pediatric Emergency Procedures, 2nd edition, King C, Henretig FM (Eds), Lippincott Williams & Wilkins, Philadelphia 2008. Copyright © 2008 Lippincott Williams & Wilkins.
www.lww.com.