What area of the body is covered by the L5 dermatome?

The L5 dermatome primarily covers the lateral aspect of the thigh and the dorsum of the foot. This dermatome is associated with the fifth lumbar nerve root, which contributes to the sensation in these areas. The lateral aspect of the leg and the top of the foot, including the big toe, are significant areas where sensory input from the L5 dermatome is received. Understanding dermatomes is crucial in clinical practice, especially for diagnosing nerve root injuries and conditions such as sciatica.

In contrast, the areas mentioned in the other choices do not correspond to the L5 dermatome. The medial knee corresponds more closely with the L3 dermatome, while the lower back is associated with the L1 and L2 dermatomes. The inner thigh is typically related to the L2 and L3 dermatomes, making it clear that option C identifies the correct distribution related to the L5 dermatome.