• No physical examination available due to the small size of the subclavius and the inability to palpate the muscle and not particularly clinically relevant.
• Depresses and stabilizes the clavicle.
• Variants of the subclavius or a subclavius posticus muscle could theoretically contribute to the pathology associated with thoracic outlet syndrome.
Muscle Function: Depresses and stabilizes the clavicle--but this is essentially impossible to detect on clinical exam.
Palpation: No reliable palpation available due to the small size of the subclavius.
Strength Testing: No physical examination available due to the nature of the subclavius.
• Roots: C5, C6.
• Nerve: Subclavian nerve.
• Innervation Route: C5, C6.→ superior trunk → subclavian nerve.
Origin: First rib and its cartilage at their junction.
Insertion: Under surface of the clavicle.