trapezius

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tra·pe·zi·us (mus·cle)

[TA]
extrinsic (thoracoappendicular) muscle of shoulder; origin, medial third of superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of seventh cervical and the thoracic vertebrae and corresponding supraspinous ligaments; insertion, lateral third of posterior surface of clavicle, anterior side of acromion, and upper and medial border of the spine of the scapula; action, when scapulae are fixed, portions of muscle can act independently: cervical portion elevates scapula, thoracic portion contributes to depression of scapula; upper and lowermost portions act simultaneously to rotate glenoid fossa superiorly; when the entire muscle and especially middle part contracts, the scapulae retract; draws head to one side or backward; nerve supply, motor by accessory, sensory by cervical plexus.
Synonym(s): musculus trapezius [TA], cowl muscle

trapezius

(trə-pē′zē-əs)
n. pl. trapezi·uses
Either of two large flat triangular muscles running from the base of the occiput to the middle of the back that support and make it possible to raise the head and shoulders.

trapezius

[trəpē′zē·əs]
Etymology: Gk, trapezion, small table
a large, flat, triangular superficial muscle of the shoulder and upper back. It arises from the occipital bone, the ligamentum nuchae, and the spinous processes of the seventh cervical and all the thoracic vertebrae. It acts to rotate the scapula upward; adduct, raise, or lower the shoulder; and retract the shoulder.
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Trapezius

tra·pe·zi·us mu·scle

(tră-pē'zē-ŭs mŭs'ĕl)
Origin, medial third of superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of seventh cervical and the thoracic vertebrae and corresponding supraspinous ligaments; insertion, lateral third of posterior surface of clavicle, anterior side of acromion, and upper and medial border of the spine of the scapula; action, when scapulae are fixed, portions of muscle can act independently: cervical portion elevates scapula, thoracic portion contributes to depression of scapula; upper and lowermost portions act simultaneously to rotate glenoid fossa superiorly; when the entire muscle and especially its middle part contracts, the scapulae retract; draws head to one side or backward; nerve supply, motor by accessory, sensory by cervical plexus.
Synonym(s): musculus trapezius [TA] , trapezius.
Figure 1: Efferent nerve pathways from the brainstem and spinal cord. Shown on the right: somatic, to skeletal muscles. Shown on the left: autonomic. B brain stem, C cervical, T thoracic, L lumbar, S sacral segments of the spinal cord. (Red shaded regions are those with no autonomic outflow.)

trapezius

large, triangular, superficial muscle on each side of the upper back, its origin extending in the midline from the base of the skull down to the spine of the lowest thoracic vertebra. From there its fibres converge towards the shoulder, and partly over it, round the side of the lower neck, to be inserted in a continuous line into the outer end of the clavicle and the spine of the scapula. The tone of the two muscles keeps the shoulders braced and they act with the scapular spine as a lever when lifting the arms at the shoulder. Figure 1.
References in periodicals archive ?
In this observational study (case series), over a period of two years from August 2014 to July 2016, 41 male patients and 1 female patient with longstanding brachial plexus palsy underwent secondary reconstruction of the shoulder by transfer of trapezius muscle to proximal humerus.
The objective of this study was to evaluate the effects of therapeutic sequences of the hot pack in combination with ultrasound on the physiological responses (TBF, PPT, STT, and VAS) for treatment of the latent myofascial trigger point (LMTrP) over upper trapezius muscle.
Figure 1 shows the phases of protocol of the electromyographic evaluation for the SCM and upper fibers of trapezius muscles.
Here, we report four atypical cases of isolated spinal accessory nerve palsy leading to trapezius muscle dysfunction.
Her neck was pain-free and she had restored symmetrical cervical spine ROM rotation to 60[degrees] bilaterally, negative median and ulnar nerve ULTT, no pain on spring tests from C7-T5, and no tightness in her right SCM, levator, and upper trapezius muscles.
The antero-posterior (AP) dimension of the fat between the supraspinatus and trapezius muscles and the supraspinatus muscle was measured at the level of the suprascapular neurovascular bundle medial to the acromion.
24) These postures may be combined with high static loads and fatigue in the trapezius muscles.
Ill-fitting bra straps can pull or press on your trapezius muscles - which run along the neck and back - and can cause pain and discomfort.
They found that the women worked with greater extension and ulnar deviation of the wrist and applied higher forces to the mouse (expressed as a percentage of a maximum voluntary contraction) while performing the same task and that they had higher muscular activity in the right and left trapezius muscles than did men.
Ian said: "This will help work the trapezius muscles at the top of your back and bottom of your neck.