[15] The posterior rami provide spine muscle and trunk skin sensation. The most complex nerve plexus is the brachial plexus, consisting of cervical nerves 5 through 8 (C5 to C8) and thoracic nerve ...

Upper-arm weakness (paresis) or paralysis indicates peripheral-nerve damage to the brachial plexus, a network of lower cervical and upper thoracic spinal nerves supplying the arm, forearm ...

An increased risk of lymph contamination exists at this sampling site 3. Anatomy. The brachial vein is a plexus of vessels at the ventromedial (flexor) surface of the radiohumeral joint (elbow ...