While trying to fix some loose boards on his deck, Bob hit his left thumbwith his hammer. The hammer struck his thumbnail distal to the lunulaand proximal to the hyponychium. After a short period, a dark areaappeared in the area of the nail bed. The injury was very painful until aphysician drilled a small hole through Bob’s nail, releasing bloody fluid.After nearly 2 months, the dark area moved to the free edge of the nail.Explain why a dark area developed in the nail. What caused Bob’s pain,and why did drilling a hole in his nail relieve it? Why did the dark areamove distally over time?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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While trying to fix some loose boards on his deck, Bob hit his left thumb
with his hammer. The hammer struck his thumbnail distal to the lunula
and proximal to the hyponychium. After a short period, a dark area
appeared in the area of the nail bed. The injury was very painful until a
physician drilled a small hole through Bob’s nail, releasing bloody fluid.
After nearly 2 months, the dark area moved to the free edge of the nail.
Explain why a dark area developed in the nail. What caused Bob’s pain,
and why did drilling a hole in his nail relieve it? Why did the dark area
move distally over time?

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