From the Research
The muscle under the clavicle is the subclavius muscle, which plays a crucial role in stabilizing the clavicle during movements of the shoulder and protecting underlying neurovascular structures. This small, cylindrical muscle runs between the first rib and the underside of the clavicle (collarbone) 1. Its primary function is to stabilize the clavicle during movements of the shoulder by depressing and pulling the clavicle forward and downward. This stabilization is particularly important during activities that involve raising the arm or during forceful shoulder movements. The subclavius muscle also helps protect the underlying neurovascular structures (such as the subclavian vessels and brachial plexus) by providing a cushioning effect if the clavicle fractures. Additionally, it contributes to the overall movement of the shoulder girdle, assisting in the depression and protraction of the scapula.
The subclavius is innervated by the subclavian nerve, which branches from the upper trunk of the brachial plexus (C5-C6), and receives its blood supply from the clavicular branch of the thoracoacromial artery. Some studies have investigated the treatment of clavicle fractures and their impact on the subclavius muscle, highlighting the importance of proper management to prevent complications such as brachial plexus palsy 2, 1. However, the most recent and highest quality study on the topic of muscle function and anatomy under the clavicle is not directly provided in the given evidence, but based on the available information, the subclavius muscle's role in shoulder movement and stability is well-established 1.
Key points about the subclavius muscle include:
- It stabilizes the clavicle during shoulder movements
- It protects underlying neurovascular structures
- It contributes to the overall movement of the shoulder girdle
- It is innervated by the subclavian nerve and receives blood supply from the clavicular branch of the thoracoacromial artery
- Its function and anatomy are crucial in the context of clavicle fractures and their treatment 3, 4.