Subclavius

OVERVIEW
Key Points:

• 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.

EXAMINATION
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.

Substitutions: None.

Relevant Anatomy:
Innervation:

• Roots: C5, C6.
• Nerve: Subclavian nerve.
• Innervation Route: C5, C6.â†’ superior trunk â†’ subclavian nerve.

Origin: First rib and its cartilage at their junction.

Insertion: Under surface of the clavicle.

Subclavius

OVERVIEW
Key Points:

• 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.

EXAMINATION
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.

Substitutions: None.

Relevant Anatomy:
Innervation:

• Roots: C5, C6.
• Nerve: Subclavian nerve.
• Innervation Route: C5, C6.â†’ superior trunk â†’ subclavian nerve.

Origin: First rib and its cartilage at their junction.

Insertion: Under surface of the clavicle.

Subclavius

Subclavius

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