Anat. [mod.L. subclāvius (sc. musculus, f. sub- SUB- 1 b + clāvis key (cf. CLAVICLE1 etym.).] In full subclavius muscle: A small muscle extending from the first rib to the clavicle.

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1704.  J. Harris, Lex. Techn., I. Subclavius, is a Muscle of the Thorax.

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1733.  trans. Winslow’s Anat. (1756), I. 288. The Subclavius … is a proper Depressor of the Clavicula.

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1831.  Knox, Cloquet’s Anat., 31. Its anterior extremity [sc. of the first rib] … sometimes affords insertion above to the sub-clavius muscle.

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1835–6.  Todd’s Cycl. Anat., I. 360/1. The thickened edge of the fascia which covers the subclavius.

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