After a nurse has inserted a peripheral IV catheter, which layer of the skin has the catheter most likely penetrated?

• A. Dermis
• B. Stratum corneum
• C. Epidermis
• D. Hypodermis

Answer: (A)

Verified step by step guidance

1. Understand the structure of the skin: The skin is composed of three main layers—epidermis (outermost layer), dermis (middle layer), and hypodermis (innermost layer). Each layer has distinct functions and characteristics.
2. Review the function of the dermis: The dermis contains blood vessels, nerves, and connective tissue. Peripheral IV catheters are inserted to access blood vessels, which are located in this layer.
3. Eliminate incorrect options: The stratum corneum is part of the epidermis and is the outermost layer of dead cells, which does not contain blood vessels. The hypodermis is primarily composed of fat and connective tissue, and while it provides cushioning, it is not the primary target for IV catheter insertion.
4. Focus on the dermis: Since the dermis contains blood vessels, it is the layer most likely penetrated by the catheter during insertion. This aligns with the purpose of IV catheter placement, which is to access the circulatory system.
5. Confirm the correct answer: Based on the anatomical structure and function of the skin layers, the dermis is the correct answer for the layer most likely penetrated by the peripheral IV catheter.