COMLEX USA Practice Exam 2025 – The All-in-One Guide to Master the Comprehensive Osteopathic Medical Licensing Exam

Question: 1 / 400

What is the dermatome region for T1?

Xyphoid

Nipple

Medial upper arm

The dermatome region for T1 corresponds to the medial aspect of the upper arm. The T1 spinal nerve is responsible for sensation in the skin of that area. Dermatomes are regions of the skin that are mainly supplied by a single spinal nerve root, and T1 specifically contributes to sensory innervation in the medial upper arm, often extending down towards the elbow.

In contrast, the other options refer to different dermatomes: the xyphoid process is innervated primarily by lower thoracic nerves (most closely T7-T9), the nipple area is typically supplied by T4, and the forearm receives its sensory supply from lower cervical nerves (C6-T1). Understanding these specific dermatomal mappings is essential in clinical practice for diagnosing nerve injuries and for localizing lesions along the spinal cord.

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Forearm

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