Scalenus medius

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Scalenus medius
Scalenus medius.png
The anterior vertebral muscles. (Scalenus medius visible at bottom center-right in red.)
Gray385 - Scalenus medius muscle.png
Muscles of the neck. Scalenus medius shown in red.
Latin Musculus scalenus medius
Posterior tubercles of the transverse processes of the lower six cervical vertebræ (C2, C3, C4, C5, C6 and C7)
Upper surface of the first rib
Ascending cervical artery (branch of Inferior thyroid artery)
Ventral rami of the third to eighth cervical spinal nerves
Actions Elevate 1st rib, rotate the neck to the opposite side
Gray's p.396
TA A04.2.01.005
FMA FMA:13386
Anatomical terms of muscle

The Scalenus medius, also known as the middle scalene, is the largest and longest of the three scalene muscles in the human neck.


The middle scalene arises from the posterior tubercles of the transverse processes of the lower six cervical vertebræ. It descendes along the side of the vertebral column to insert by a broad attachment into the upper surface of the first rib, between the tubercle and the subclavian groove. The brachial plexus and the subclavian artery pass anterior to it. Because it elevates the upper ribs, the middle scalene muscle is also one of the accessory muscles of respiration.

Clinical Significance[edit]

It is involved in thoracic outlet syndrome, which is compression of the subclavian vessels and nerves of the brachial plexus in the region of the thoracic inlet.

Additional images[edit]

See also[edit]


This article incorporates text from a public domain edition of Gray's Anatomy.

External links[edit]