Expansion
Biceps C5 to C6, Supinator C6, Triceps C7 to C8
Mnemonic
Count upwards in pairs, using the traditional rhyme:
- S1, 2 - buckle my shoe (ankle jerk)
- L3, 4 - kick the door (knee jerk)
- C5, 6 - pick up sticks (biceps and supinator)
- C7, 8 - lay them straight (triceps)
Read from the foot upwards, the root values simply run 1 to 8.
Expansion
- Biceps reflex - C5, C6
- Supinator (brachioradialis) reflex - C6
- Triceps reflex - C7, C8
Remember the run 5, 6, 7, 8: biceps sits at the bottom, triceps at the top.