Template:Muscles
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Description[edit source]
Origin[edit source]
C3-6
Anterior tubercles of the transverse processes of the third, fourth, fifth, and sixth cervical vertebrae.
Insertion[edit source]
1st rib
By a narrow, flat tendon into the scalene tubercle on the inner border of the first rib, and into the ridge on the upper surface of the rib in front of the subclavian groove.
Nerve Supply[edit source]
Brachial plexus, C5-7
Anterior branches of the Cervical nerves 5 to 7
Blood Supply[edit source]
Ascending cervical branch of the inferior thyroid artery
Action[edit source]
Acts with Middle and Posterior Scalenes
When the Scalenes act from above, they elevate the first and second ribs.
Acting from below, they produce side flexion of the vertebral column[1]; if the muscles of both sides act, the vertebral column is slightly flexed.
All 3 scalene muscles produce rotation of the cervical spine to the same side[2].
Function[edit source]
When acting from above, they help to elevate the 1st rib and are accessory muscles of respiration.
Acting from below they are cervical flexors and rotators.
Resources[edit source]
Recent Related Research (from Pubmed)[edit source]
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References[edit source]
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- ↑ Buford JA, Yoder SM, Heiss DG, Chidley JV (Oct 2002). "Actions of the scalene muscles for rotation of the cervical spine in macaque and human". J Orthop Sports Phys Ther 32 (10): 488–96.
- ↑ J Manipulative Physiol Ther. 2010 Oct;33(8):594-602. doi: 10.1016/j.jmpt.2010.08.015. Functional anatomy of human scalene musculature: rotation of the cervical spine. Olinger AB, Homier P.