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The carotid sinus nerve, also known as the nerve of Hering, is a small branch of the glossopharyngeal nerve (cranial nerve IX). It plays a significant role in the regulation of cardiovascular function. Here's an overview of its key features and functions: 1. **Location**: The carotid sinus nerve primarily innervates the carotid sinus, which is a dilation located at the bifurcation of the common carotid artery into the internal and external carotid arteries.