trapezius


Also found in: Dictionary, Thesaurus, Wikipedia.
Related to trapezius: latissimus dorsi

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.
enlarge picture
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 ?
Based on the obtained results, it is thought that IFC seems to induce a relaxation of the upper trapezius muscle in both medium-term analyses at rest and during functional activities.
The case group demonstrated a trend towards higher upper trapezius amplitudes but this was only significant for the left upper trapezius during mousing.
Effect of side dominance on myoelectric manifestations of muscle fatigue in the human upper trapezius muscle.
20) Akesson reports that 81% of a sample of 30 dental hygienists had specific neck/shoulder findings on physical examination, and 43% were diagnosed with specific neck/shoulder MSDs, including tension neck syndrome and trapezius myalgia.
Strength in the upper trapezius was assessed by shoulder shrug and rated on a scale of 0 to 5, with 0 indicating no active muscle contraction, 1 indicating trace contraction, 2 indicating weak contraction manifested by an inability to raise the scapula against gravity, 3 indicating contraction sufficient to raise the scapula against gravity only, 4 indicating an ability to raise the scapula against some resistance by the examiner, and 5 indicating an ability to raise the scapula against substantial resistance by the examiner.
Muscles Worked: Rectus and transverse abdominus, obliques, rhomboids, trapezius, triceps, pectorals, biceps and deltoids
As such, we designed a study to assess the EMG activity at the MU level during finger tapping in the trapezius muscle over a 5-min period.
alveoli brachialis buccinator calcaneus canine Eustachian tube incisor jejunum maxillary sinus mental foramen metatarsals pericardium phalanges pituitary platysma sphenoid sternocleidomastoid trapezius trochlea vertebra
Ian said: "This will help work the trapezius muscles at the top of your back and bottom of your neck.
The increased penetration of his torso and consequent neck hyper-flexion produced an immediate muscle spasm in his neck, especially in the left upper trapezius and left sternocleidomastoid muscles.
In upper cross syndrome, the tight muscles usually are the upper trapezius (located between shoulder and neck), neck extensors, sternocleidomastoid (large muscle located in front of the neck), pectoralis major and levator scapulae (running from neck to shoulder blade).
On physical examination, she had significant contraction in the latissimus dorsi flap and tenderness in the rhomboid, superior trapezius, supraspinatus, and along the right sternal border.