Upper limb muscles have an innervation from roots C 5 to C8 with a small commissure from C4 and Th1. These roots are connected into three bundles (fasciculus lateralis, fasciculus medialis and fasciculus posterior). In the area of a clavicle these bundles are divided into two parts: supraclavicular and infraclavicular. Motor nerves, which are related to the shoulder joint, rise from these bundles.
| Supraclavicular Bundle containing these Nerves |
| Nerves rising from the supraclavicular bundle and innervating muscles of the shoulder girdle: | |
| Nerve | radicular distribution |
| C 5-6 | |
| n. dorsalis scapulae | C 5 |
| n. suprascapularis | C 5-6 |
| n. thoracodorsalis | C 7-8 |
| n. subscapularis | C 5-6 |
| Infraclavicular Bundle containing these Nerves |
| Nerves rising from the infraclavicular bundle and
innervating muscles of the shoulder girdle: |
|
| Nerve | radicular distribution |
| n. axillaris | C 5-6 |