Which dermatome corresponds to the first three toes?

The correct answer is linked to the anatomical mapping of sensory nerves in the lower limb. The first three toes are predominantly innervated by the L5 dermatome. This region includes the skin on the medial aspect of the foot and toes, accounting for feeling in the first three digits: the hallux (big toe), second toe, and third toe.

Understanding dermatomes is crucial in clinical practice, particularly when assessing potential nerve injuries or diseases that might affect sensory perception. For instance, if a patient experiences numbness or altered sensation in these toes, it suggests an issue with the L5 nerve root.

Other dermatomes mentioned do have sensory contributions to the foot, but they do not correspond to the first three toes as precisely as L5 does. L2 primarily covers the upper thigh area, L4 involves the medial side of the ankle and foot, and S1 encompasses the lateral aspect of the foot and the heel. Hence, focusing on the sensory distribution, the L5 dermatome is specifically tailored to the innervation of the first three toes.