# The Sensory Gatekeeper of the Larynx: Anatomy and Clinical Importance of the Internal Branch of the Superior Laryngeal Nerve

## TL;DR

This paper explores the anatomy and clinical importance of a nerve in the larynx that is often injured during neck surgeries.

## Contribution

The paper provides a detailed anatomical review of the internal branch of the superior laryngeal nerve and its clinical relevance.

## Key findings

- The IbSLN is crucial for laryngeal sensory functions and is vulnerable during cervical surgeries.
- Anatomical variations and relationships with vascular structures are highlighted for clinical awareness.
- Injury to this nerve can lead to postoperative complications like impaired reflexes.

## Abstract

The internal branch of the superior laryngeal nerve (IbSLN) plays a critical role in the sensory innervation of the supraglottic larynx. It is essential for protective reflexes such as coughing and swallowing. This nerve is frequently at risk during surgeries involving the cervical region, including thyroidectomy, carotid endarterectomy, and anterior cervical spine procedures. Injury to the IbSLN may lead to postoperative complications. A comprehensive review of the morphological and topographic characteristics of the IbSLN is presented, focusing on its anatomical course, relationships with key vascular structures, branching patterns, and clinically significant variations.