Which layer of skin is primarily affected by abrasions?

The epidermis is the outermost layer of the skin and is primarily affected by abrasions. When an abrasion occurs, it involves the removal or damage of the epidermis due to friction or scraping against a rough surface. This often results in superficial injuries that may cause redness, pain, swelling, and sometimes bleeding if the underlying dermis is affected.

Understanding the structure of the skin helps clarify why abrasions primarily impact the epidermis. The epidermis serves as the body's first line of defense against environmental factors, and while it can regenerate quickly, it is more susceptible to abrasions because it is thin compared to the deeper layers of skin. The dermis, hypodermis, and subcutaneous layer lie beneath the epidermis and would generally only be affected in more serious injuries, such as lacerations or punctures. Thus, abrasions predominantly compromise the integrity of the epidermis.