subclavius

Etymology
Borrowed from, from.

Noun

 * 1)  A muscle which (in humans) originates from the first costal cartilage and inserts on to the undersurface of the clavicle, acting to elevate the first rib or fix the clavicle.

Etymology
From.

Adjective

 * 1)  under the clavicle
 * musculus subclavius