Examination of Peripheral Nerve Injuries: An Anatomical Approach by Russell Stephen M

Author:Russell, Stephen M.
Language: eng
Format: epub
Publisher: Thieme Medical Publishing Inc.

The volar and dorsal aspects of the long finger are almost exclusively within the C7 dermatome (see ▶ Fig. 5.2). The sensory division of the median nerve (volar aspect of the long finger and its nail bed) and the superficial sensory radial nerve (dorsal aspect of the long finger) carry this sensation. Lesions of the middle trunk, consisting solely of C7 fibers, logically have the same pattern of sensory loss.

C8 Spinal Nerve: Hand Grasp

The C8 spinal nerve provides motor input to many of the long finger flexors (and extensors), as well as to the hand intrinsic muscles. Innervation of the hand intrinsics is shared with T1. Some common muscles that are weak with a C8 palsy include the flexor profundi to the index and long finger (distal interphalangeal joint flexion), thenar intrinsics including the abductor pollicis brevis and opponens pollicis, and extensors to the thumb, forefinger, and long finger. Therefore, an easy way to assess C8 function is to have the patient grasp and let go, especially with the first three digits (▶ Fig. 5.7). A C8 palsy would prevent the patient from performing this movement.

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