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Cranial nerve XII: the hypoglossal nerve
1Department of Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA. hlin@mcw.edu
Seminars in Neurology
|February 14, 2009
Summary
The hypoglossal nerve controls tongue movement and can be impacted by various conditions. Understanding its anatomy and performing thorough tongue examinations are crucial for diagnosing and managing related neurological disorders.
Area of Science:
- Neurology
- Anatomy
- Physiology
Background:
- The hypoglossal nerve (CN XII) is essential for motor control of the tongue.
- Pathology affecting the hypoglossal nerve can occur at numerous anatomical sites.
- Accurate diagnosis relies on understanding the nerve's pathway and tongue examination.
Purpose of the Study:
- To review the anatomy and physiology of the hypoglossal nerve.
- To discuss clinical disorders involving the hypoglossal nerve.
- To outline the evaluation methods for hypoglossal nerve dysfunction.
Main Methods:
- Literature review of anatomical and clinical studies.
- Synthesis of information on hypoglossal nerve function and pathology.
- Description of diagnostic approaches and examination techniques.
Main Results:
- Detailed anatomical course of the hypoglossal nerve described.
- Common and rare clinical conditions affecting the nerve identified.
- Systematic approach to clinical evaluation presented.
Conclusions:
- Comprehensive knowledge of hypoglossal nerve anatomy is vital for localization of lesions.
- Clinical examination of the tongue is a key diagnostic tool.
- Understanding the nerve's pathway aids in appropriate testing and management.
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