Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

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Prepare for the COMLEX-USA with quizzes featuring flashcards and multiple-choice questions, each with hints and explanations. Gear up for your osteopathic medicine exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the dermatome region for T1?

Xyphoid
Nipple
Medial upper arm
Forearm

The correct answer is: 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.