Overview
The research aims at analyzing the sonographic anatomy characteristics of the interscalene brachial plexus.
Eligibility
Inclusion Criteria:
- ASA physical status class I or II
- Scheduled for elective surgery
Exclusion Criteria:
- Skin lesion or infection of neck
- Any known peripheral neuropathy
- Brachial nerve plexus injury
- Previous injury or operation on neck
- Pregnancy or breast feeding
- Allergic to ultrasound gel