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Scalenus minimus

Other Terms: Variant scalene muscle, Sibson's muscle, Musculus scalenus minimus, Muscle petit scalène

Muscle parts

None

Latin name

Musculus scalenus minimus

Latin muscle parts

None

Group

Cervical wall – lateral musculature – internal layer

Etymology

The English name for this muscle is the smallest muscle with three unequal sides. Scalenus is Latin for “having three unequal sides,” which comes from the Greek skallein meaning “to hoe, or stir up.” The name of the scalene muscles can be traced back to the 17th century French anatomist Jean Riolan. He thought that the three scalenes were one muscle and he envisioned their combined shape as that of an irregular three-sided, or scalene, triangle. Minimus is the Latin word meaning “smallest.”

Origin

Transverse process of C7

Insertion

First rib

Action

Elevates the first rib – the fibers that attach to the first rib assist the anterior and middle scalene with elevation of the first rib. Tenses the dome of the parietal pleura – the fibers that flair onto the pleural dome help raise and tense this part of the parietal pleura.

Nerve supply

Branches of the ventral rami of cervical spinal nerves (C7 and C8)

Blood supply

The ascending cervical and various muscular branches from the inferior thyroid, which is a branch of the thyrocervical trunk of the subclavian artery, supply the muscle. It also receives blood from the suprascapular artery and the superficial cervical artery.

Latin

Musculus scalenus minimus

French

Muscle petit scalène

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