PMC7577891_01
Normal anatomy of median and ulnar nerves in palm. Median nerve gives of motor branches to thenar muscles, a proper digital branch to index finger, and the first, second and third common digital nerves. Whereas ulnar nerve branches into fourth common digital nerve and a proper digital nerve.
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Flexion movements of the digits were restricted (Fig. 1).
Berrettini anastomosis. In the most frequently encountered type of Berrettini anastomosis, a purely sensory communicating branch can be seen to be arising from the fourth common digital nerve (branch of ulnar nerve) and anastamosing with third common digital nerve (branch of median nerve). This results in ulnar nerve providing sensory innervation to middle finger.
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PMC7577891_01_pl2.jpg
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D2 (Fig. 2A). Distal stimulation of UN while recording over D5 (Fig. 2B), D4 and D3 resulted in a normal SNAP. Furthermore, the most significant finding was that upon distal stimulation of UN while recording over D2 also resulted in a normal SNAP (Fig. 2C), the amplitude of which was 64% the SNAP amplitude recorded from D5.