Anatomy in detail.
The left and right trapezius muscles form the most superficial muscle layer from mid-back to the base of the skull.
Thin muscles, sculpted down the neck and towards the shoulders, attaching to both scapula (shoulder blade) and clavicle (collar bone) of each arm.
The trapezius muscles meet midline, attaching to the spine via the nuchal and supraspinous ligaments.
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 each trapezius into 3 functional sections, based on the direction of the muscle fibres.
a.k.a. superior (i.e. higher than the other sections) trapezius.
a.k.a. descending (i.e. the muscle fibres descend) trapezius.
a.k.a. transverse (i.e. the muscle fibres run approx. horizontally) trapezius.
a.k.a. inferior (i.e. lower than the other sections) trapezius.
a.k.a. ascending (i.e. the muscle fibres ascend) trapezius.
Between the 6th cervical and 3rd thoracic vertebrae (the base of the nuchal ligament and start of the supraspinous ligament) the trapezius muscles are connected to the midline by a broad semi-elliptical aponeurosis (thin sheet of strong connective tissue), forming a tendinous ellipse between the shoulder blades.
Photo human cadaver tendinous ellipse.
The trapezius muscles align the upper body attaching to the nuchal and supraspinous ligaments (secondary guides for body alignment) midline.
The trapezius muscles should be free the extend in all directions.
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