There are multiple definitions:

1. sinoatrial node(English)

   • =SA
   • APG, AVN, AVR, CT, PM, SNA, SA
   • Cardiology, Anatomy, Electrophysiology
   • https://www.aer…logy-sinus-node

2. spinal accessory nerve(English)

   • injury results in a series of shoulder dysfunctions and continuous pain
   • NFT, PD
   • Shoulder and other joints, Spine (or spinal cord), Pain, Injury
   • https://doi.org…17.8.SPINE17582