Superficial cervical plexus block ultrasound probe placement

For ultrasound-guided superficial cervical plexus block, the ultrasound probe is placed in a transverse orientation at the posterior border of the sternocleidomastoid muscle, midway between the mastoid process and the C6 transverse process. For further details on this block, refer to the UpToDate topic on nerve blocks of the scalp, neck, and trunk.