Which dermatome runs along the medial arm (brachium)?

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Multiple Choice

Which dermatome runs along the medial arm (brachium)?

Dermatomes are skin areas supplied by a specific spinal nerve root. The medial (inner) side of the upper arm corresponds to the T1 dermatome. This makes sense because T1 covers the medial aspect of the upper limb (and extends into the medial forearm), while the other roots map to different regions: C6 tends to the lateral arm/forearm and thumb area, C7 to the middle finger and portions of the arm, and C8 to the medial forearm and hand. So, for the medial arm, the T1 dermatome is the best fit.

Dermatomes are skin areas supplied by a specific spinal nerve root. The medial (inner) side of the upper arm corresponds to the T1 dermatome. This makes sense because T1 covers the medial aspect of the upper limb (and extends into the medial forearm), while the other roots map to different regions: C6 tends to the lateral arm/forearm and thumb area, C7 to the middle finger and portions of the arm, and C8 to the medial forearm and hand. So, for the medial arm, the T1 dermatome is the best fit.

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