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Cervical Spine Muscles Trapezius medical education videos

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  • Provider: YouTube Link: http://www.youtube.com/watch?v=BWV1kNn4nL8
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  • Description: Cervical Spine Muscles Trapezius medical education videos. Shows lateral and posterior views during upper trapezius contraction and relaxation.

    DESCRIPTION
    Trapezius is a flat triangular muscle covering the back of the neck and the upper thorax. The superior fibres descend, the inferior fibres ascend, and the intermediate fibres proceed horizontally. All fibres converge laterally on the shoulder.

    ORIGIN
    Trapezius originates from the medial third of the superior nuchal line, external occipital protuberance, ligamentum nuchae, and apices of spinous process and their supraspinous ligaments from seventh cervical to twelfth thoracic vertebra.

    INSERTION
    Trapezius superior fibres insert into the posterior border of lateral third of clavicle.
    Trapezius intermediate fibres insert into the medial acromial margin and superior lip of the crest of the scapular spine.
    Trapezius inferior fibres join an aponeurosis that inserts into a tubercle at the lateral apex of the scapular spine. Cervical Spine Muscles Trapezius medical education videos.

    VARIATIONS
    Trapezius' clavicular attachment sometimes reaches the middle of the clavicle, and occasionally blends with sternocleidomastoid.

    INNERVATION
    Trapezius motor supply is from the spinal part of the accessory nerve. Sensory innervation is from the ventral rami of C3 and C4.

    BLOOD SUPPLY
    Trapezius is supplied by the superficial cervical artery or superficial branch of transverse cervical artery, acromial branch of suprascapular artery, dorsal perforating branches of posterior intercostal arteries.

    ACTION
    Trapezius stabilises the scapulae.
    Trapezius upper fibres elevates and rotates the scapulae forward (with serratus anterior) and retracts (with rhomboids) the scapulae. Cervical Spine Muscles Trapezius medical education videos.
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