Subclavian_nerve
The subclavian nerve, also known as the nerve to the subclavius, is a small branch of the upper trunk of the brachial plexus. It contains axons from C5 and C6. It innervates the subclavius muscle.
| Subclavian nerve | |
|---|---|
Diagram of the right brachial plexus. Subclavian nerve labelled at top right. | |
The right brachial plexus with its short branches, viewed from in front. Subclavian nerve not visible. | |
| Details | |
| From | upper trunk (C5-C6) of brachial plexus |
| To | sometimes the accessory phrenic nerve |
| Innervates | subclavius muscle |
| Identifiers | |
| Latin | nervus subclavius |
| TA98 | A14.2.03.013 |
| TA2 | 6412 |
| FMA | 65280 |
| Anatomical terms of neuroanatomy | |
Origin
The subclavian nerve is a branch of the upper trunk of the brachial plexus. It contains axons derived from the ventral rami of the C5 and C6 cervical spinal nerves.[1]
The origin is situated within the posterior triangle of the neck.[2]
Course
Descending, it passes anterior to (the 3rd part of) the subclavian artery and vein.[2]
Variation
Accessory phrenic nerve
The subclavian nerve may issue a branch called the accessory phrenic nerve[3][2] which innervates the diaphragm.[3] The accessory phrenic nerve may rather branch from the C4 or C6 segments or ansa cervicalis.[4] This nerve usually joins with the phrenic nerve before innervating the diaphragm, ventral to the subclavian vein.[5]
The subclavian nerve innervates the subclavius muscle.[6]
- Diagram of the brachial plexus. The subclavian nerve can be seen branching from where C5 and C6 join to form the upper trunk. (Label at top right).
- The right brachial plexus. The subclavian nerve is not visible, but the muscle it innervates called the subclavius can be seen underneath the clavicle.
- Kadasne, D. K. (2009). Kadasne's Textbook of Anatomy (1st ed.). New Delhi: Jaypee Brothers Medical Publishers. ISBN 978-81-8448-455-7. OCLC 682534511.
- Kayalioglu, Gulgun (2009-01-01), "Chapter 4 - The Spinal Nerves", in Watson, Charles; Paxinos, George; Kayalioglu, Gulgun (eds.), The Spinal Cord, San Diego: Academic Press, pp. 37–56, ISBN 978-0-12-374247-6, retrieved 2022-06-14
- Sharma, Manish S.; Loukas, Marios; Spinner, Robert J. (2011). "Accessory phrenic nerve: A rarely discussed common variation with clinical implications". Clinical Anatomy. 24 (5): 671–673. doi:10.1002/ca.21142. PMID 21374726. S2CID 20001098.
- Drake, Richard L. (2005). Gray's anatomy for students. Wayne Vogl, Adam W. M. Mitchell, Henry Gray. Philadelphia: Elsevier / Churchill Livingstone. p. 645. ISBN 0-443-06612-4. OCLC 55139039.
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