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Navicular hand8/14/2023 The patient extends the distal IP joint of the affected finger. The patient extends the distal IP joint of the affected finger while the other fingers are kept extended.ĭisrupted flexor digitorum profundus (i.e., jersey finger) The patient flexes the proximal IP joint of the affected finger while the other fingers are kept extended. The radial nerve extends the fingers to enhance grasp with the ulnar nerve. The median nerve supplies the thenar compartment, providing opposition and circumduction for fine control. The median nerve passes into the hand via the carpal tunnel of the volar aspect of the wrist. The ulnar nerve also innervates the adductor pollicis and first dorsal interosseous muscles, which allow pinch. The ulnar nerve supplies the intrinsic muscles of the hand as well as the extrinsic muscles for flexion of the fourth and fifth fingers to provide power grip. The ulnar nerve enters the hand alongside the ulnar artery through Guyon's canal, located between the pisiform and the hook of the hamate and covered by the pisohamate ligament ( Figure 4). However, to truly place the hand in a functioning position, the entire upper extremity must be involved. In general, the radial nerve accounts for wrist and finger extension, the ulnar nerve provides power grip, the median nerve allows for fine control of the pincer grip, and the median and ulnar nerves supply sensation to the palmar surface.
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