Flexors of the fingers (C 7, 8, T1): Ask the patient to make a fist, squeezing their hand around two of your fingers. If the grip is normal, you will not be able to pull your fingers out.
Test each hand separately. The Flexor Digitorum Profundus controls finger flexion and is innervated by the Median (radial 1/2) and Ulnar (medial 1/2) Nerves.
For more information about finger flexors, see the following links:
Wrist flexion (C 7, 8, T 1): Have the patient try to flex their wrist as you provide resistance. Test each hand separately. The muscle groups which control flexion are innervated by the Median and Ulnar Nerves.
For more information about wrist flexors, see the following links:
Wrist extension (C 6, 7, 8): Have the patient try to extend their wrist as you provide resistance. Test each hand separately. The Extensor Radialis muscles control extension and are innervated by the Radial Nerve. Clinical Correlate: Damage to the radial nerve results in wrist drop (loss of ability to extend the hand at the wrist). This can occur via any one of a number of mechanisms. For example, the nerve can be compressed against the humerus for a prolonged period of time when an intoxicated person loses consciousness with the inside aspect of the upper arm resting against a solid object (known as a “Saturday Night Palsy”).
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