Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

Which dermatome corresponds to the groin area?

1. Dermatome L1-L2

2. Dermatome T12

3. Dermatome T10

4. Dermatome S2

The correct answer is: Dermatome T12

The dermatome that corresponds to the groin area is primarily the L1 dermatome, which includes the region of the inguinal area (groin). The reason for this lies in the distribution of sensory nerves, where each dermatome corresponds to a specific segment of the spinal cord and innervates a particular area of the skin. The L1 dermatome specifically covers the upper part of the groin, but the choice of T12, while it may involve some sensation from the lower abdominal region, does not accurately represent the innervated area associated with the groin. Similarly, T10 generally corresponds more to the umbilical area and does not extend into the groin. The S2 dermatome relates to the posterior aspect of the lower limb and does not cover the groin either. Given the significant role of L1 in the sensory mapping of the groin area, it is clear that L1 is the more appropriate response for representing that region. In clinical assessments or physical examinations, healthcare providers will often reference L1 for sensory testing involving the groin, further solidifying its importance in this context.