How do the circumflex vein and artery pass through P3?

• A. Bulbar arteries
• B. Palmar arteries
• C. Paracuneal arteries
• D. Terminal arch of the digital arteries

Answer: (D)

The blood supply around the coffin bone is organized so that the circumflex vessel loops around P3 and passes through the distal area with the digital arterial network at a point called the terminal arch. This terminal arch, formed by the palmar digital arteries, provides the through-pass for the circumflex artery and its accompanying vein to reach the structures within and around P3. The other named vessels refer to different regions or pathways and do not describe a passage through P3, so the circumflex vessels passthrough via the terminal arch of the digital arteries.