CHAPTER 22 Wrist blocks
Clinical anatomy
The hand is innervated by the three nerves that pass through the wrist (Fig. 22.1).
Sonoanatomy
The median nerve passes distally in the volar aspect of the forearm between the flexor digitorum superficialis and the flexor digitorum profundus muscles (Fig. 22.6A). Approximately 5 cm proximal to the flexor retinaculum, the median nerve courses around the radial or lateral edge of the flexor digitorum superficialis, where its position becomes more superficial. Just proximal to the carpus, the nerve lies between the tendons of the flexor digitorum superficialis and the flexor carpi radialis, partially deep to the tendon of palmaris longus (if it is present; Fig. 22.6B). The nerve then passes deep to the flexor retinaculum into the carpal tunnel of the wrist.
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