Anatomy in detail.
The trapezii (plural) are the most superficial muscle layer from mid-back to the base of the skull. Thin muscles, sculpted over the neck and towards the shoulders, attaching to both scapula (shoulder blade) and clavicle (collar bone) of each arm.
These muscles should be free to extend in all directions without pain or restriction, supporting the head and arms through their full range of movement.
Wikipedia: Trapezius: from Late Latin trapezium, from Greek τραπέζιον (trapézion), literally "a little table", a diminutive of τράπεζα (trápeza), "a table", itself from τετράς (tetrás), "four" + πέζα (péza), "a foot; end, border, edge"
Current descriptions split the trapezius into 3 functional sections, based on the direction of the muscle fibres.
a.k.a. superior (i.e. higher than the other sections) or descending (i.e. the muscle fibres descend) trapezius.
a.k.a. transverse (i.e. the muscle fibres run approximately horizontally) trapezius.
a.k.a. inferior (i.e. lower than the other sections) or ascending (i.e. the muscle fibres ascend) trapezius.
Between the 6th cervical and 3rd thoracic vertebrae the trapezius muscles are connected to the midline by a broad semi-elliptical aponeurosis (thin sheet of strong connective tissue), forming a tendinous ellipse.
Movement should not be painful.
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