scalenus

noun, plural sca·le·ni [skey-lee-nahy] /skeɪˈli naɪ/. Anatomy.

1. any of three muscles on each side of the neck, the action of which raises the first and second ribs in respiration and assists in bending the neck to one side.

noun plural -ni (-naɪ)

1. anatomy any one of the three muscles situated on each side of the neck extending from the cervical vertebrae to the first or second pair of ribs