Levator scapulae muscle

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Levator scapulae muscle
Latin musculus levator scapulae
Gray's subject #121 435
Origin: Posterior tubercles of transverse processes of C1 - C4 vertebrae
Insertion: Superior part of medial border of scapula
Artery: dorsal scapular artery
Nerve: cervical nerve (C3, C4) and dorsal scapular nerve (C5)
Action: Elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula
Dorlands/Elsevier m_22/12549630

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Overview

The levator scapulae is situated at the back and side of the neck.

Origin and insertion

It arises by tendinous slips from the transverse processes of the atlas and axis and from the posterior tubercles of the transverse processes of the third and fourth cervical vertebrae.

It is inserted into the vertebral border of the scapula, between the medial angle and the triangular smooth surface at the root of the spine.

Actions

If the head is fixed, the Levator scapulæ raises the medial angle of the scapula.

If the shoulder is fixed, the muscle inclines the neck to the corresponding side and rotates it in the same direction.

Variations

The number of vertebral attachments varies; a slip may extend to the occipital or mastoid, to the Trapezius, Scalene or Serratus anterior, or to the first or second rib.

The muscle may be subdivided into several distinct parts from origin to insertion.

Levator claviculæ from the transverse processes of one or two upper cervical vertebræ to the outer end of the clavicle corresponds to a muscle of lower animals.

More or less union with the Serratus anterior.

Nerves

The Levator scapulæ are supplied by the third and fourth cervical nerves, and frequently by a branch from the dorsal scapular.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.




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