International Board of Certified Lactation Consultant (IBCLC) Practice Exam

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Loss of sensation in the nipple and areola is typically caused by an issue with which nerve?

  1. 2nd intercostal nerve

  2. 3rd intercostal nerve

  3. 4th intercostal nerve

  4. 5th intercostal nerve

The correct answer is: 4th intercostal nerve

The loss of sensation in the nipple and areola is primarily associated with the innervation provided by the intercostal nerves, specifically the fourth intercostal nerve. This nerve supplies the skin in the area and is responsible for sensory input from the nipple and areola. When there is a dysfunction or damage to this nerve, it can result in a loss of sensation in the regions it innervates. The other intercostal nerves may also contribute to the overall sensory supply of the thoracic area, but the fourth intercostal nerve plays a pivotal role in specifically innervating the nipple and areola. Understanding the anatomical pathways of these nerves helps clarify why the loss of sensation in these areas is linked to the fourth intercostal nerve rather than the others mentioned.

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