LKnative - Suprascapular nerve block 
Nerve root of C5 (red arrow), nerve root of C6 (cyan arrow), superior trunk (magenta arrow), suprascapular nerve (green arrow), long thoracic nerve (yellow arrows), dorsal scapular nerve (blue arrow), subclavian nerve (black arrow), vertebrae C5, C6 and C7 (red, blue and magenta asterixs)
5 – Chassaignac’s anterior tubercle of the transverse process of vertebra C6
The nerve roots of C5 and C6 fuse and become the superior trunk of the brachial plexus
The suprascapular nerve typically branches off the superior trunk immediately after the fusion from the nerve roots of C5 and C6
Other nerves from the superior trunk: the subclavian nerve
Other nerves from the C5 nerve root: the long thoracic nerve, the dorsal scapular nerve
Other nerves from the C6 nerve root: the long thoracic nerve (which branches off the nerve roots from C5, C6 and C7)
The anterior tubercle of the transverse process of the C6 vertebra is prominent and is called “Chassaignac’s tubercle”
The transverse process of the C7 vertebra has no anterior tubercle