Symptom >> Internal Medicine >> Neurology

Loss of contraction or traction in the cricothyroid muscle

Introduction
Cause
Examine
Diagnosis

Introduction

Introduction In patients with supra-larynx injury, the affected side of the ring muscles loses contraction or traction during vocalization. Due to the anatomical relationship, cervical nerve damage often coincides with vascular injury. The higher the damage position, the more the multiple nerve injuries; the middle and lower neck injuries, with more single nerve damage. In facial and neck injuries, nerve damage accounts for 10% to 15%. Among them, injuries such as brachial plexus, spinal cord, recurrent laryngeal nerve and vagus nerve are more common. The laryngeal nerve is derived from the ganglion of the vagus nerve, which is located near the jugular foramen and is divided into inner and outer branches on the plane of the hyoid bone.

Cause

Cause

In patients with supra-larynx injury, the affected side of the ring muscles loses contraction or traction during vocalization. Due to the anatomical relationship, cervical nerve damage often coincides with vascular injury. The higher the damage position, the more the multiple nerve injuries; the middle and lower neck injuries, with more single nerve damage. In facial and neck injuries, nerve damage accounts for 10% to 15%. Among them, injuries such as brachial plexus, spinal cord, recurrent laryngeal nerve and vagus nerve are more common. The laryngeal nerve is derived from the ganglion of the vagus nerve, which is located near the jugular foramen and is divided into inner and outer branches on the plane of the hyoid bone. The outer branch is often accompanied by the superior thyroid artery on the way down, usually in front of the superior thyroid artery. According to the autopsy of 200 cases of Moosman, 21% of the external branches were indefinite, 15% were located in the thyroid sheath, and 6% were located between the branches of the superior thyroid artery. According to Meng Zhaohui et al. (1976), the laryngeal nerve anatomy was observed. The superior laryngeal nerve and the superior thyroid artery were closely accompanied. The nerves in the upper thyroid artery accounted for 89.3% of the upper thyroid artery and 6.7% before the artery. The difference between them is 4%.

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an examination

Related inspection

Otolaryngology CT examination neurological cytology cranial nerve examination

1. History: history of neck trauma or history of thyroid surgery.

2. Clinical manifestations: lack of high notes. Physical examination revealed abnormal glottal morphology.

Diagnosis

Differential diagnosis