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Anatomy in detail.

TRAPEZIUS

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.

trapezius keeping it simple.

the trapezius muscles shown in the outline of a human figure. From the back of your head, down the back and sides of your neck towards your shoulders and then extending down to a point at mid-back level. A large blanket of muscle over the back of the upper body, thin sculpted muscles connecting the upper body to baseline support.
The trapezius muscles seen from behind. Like a kite over the upper back, shoulders and neck. From the level of the bottom ribs, starting as point each trapezius extends up and out towards the shoulders like two triangles.  The widest part across the top of the neck/shoulders before narrowing again towards the head like another two triangles of muscle tissue, this time with the edges curved as the upper trapezius forms the back of the neck.

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"

trapezius-muscles in three sections the upper trapezius triangles, the middle trapezius horizontal strips across the shoulders, and the lower trapezius triangles ending as as point at the base of the ribs. Splitting each trapezius into 3 functional sections, so 6 sections in total picture them.

Current descriptions split each trapezius into 3 functional sections, based on the direction of the muscle fibres.

Upper trapezius

Middle trapezius

Lower trapezius

Upper trapezius

a.k.a. superior (i.e. higher than the other sections) trapezius.

a.k.a. descending (i.e. the muscle fibres descend) trapezius.

Attaches to:

off-center front view of the trapezius muscles and where they attach. The cervical vertebrae (neck bones) have been removed to reveal the nuchal ligament like a triangle of connective tissue - a blade/leaf - extending from the midline between the trapezii into the back of the neck.  Also showing the clavicle and scapula bones and the thoracic vertebrae.

Middle trapezius

a.k.a. transverse (i.e. the muscle fibres run approx. horizontally) trapezius.

skeleton and trapezius muscles off-center view from back.  Showing the trapezius muscles over the scapula and the supraspinous ligament on midline.

Attaches to:

Lower trapezius

a.k.a. inferior (i.e. lower than the other sections) trapezius.

a.k.a. ascending (i.e. the muscle fibres ascend) trapezius.

Attaches to:

Side view of the upper body and trapezius muscles showing the sculpted shape of the upper trapezius and its attachments to the clavicle. The lower trapezius meets midline attaching to the supraspinous ligamanet which blends with the connective tissues of the thoracic vertebrae. At the 12th thoracic vertebrae (last) where the bottom rib emerges the trapezius muscles form a point.
Bones and ligaments of the neck and upper back where the trapezius muscles attach. It looks complicated, the trapezius muscles attach to many structures.  The base of the skull, the midline nuchal and supraspinous ligaments, the clavicle, the scapula in multiple sites.

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 seen from behind. There is an ellipse (oval-like) sheet of connective tissue between the shoulder blades where the left and right trapezius muscles attach from the base of the nuchal ligament at C6 and the top of the supraspinous ligament to T3.

The trapezius muscles align the upper body attaching to the nuchal and supraspinous ligaments (secondary guides for body alignment) midline.

The trapezii should be free to extend in all directions without pain or restriction, supporting the head and arms through their full range of movement, connecting the upper body to Base-Line support.

the left and right trapezius muscles with the nuchal ligament midline. showing the baseline muscles, ribs and trapezius muscles extending to the head and arms.

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The trapezius muscles should be free the extend in all directions.

 OPTIMISING THE USE OF YOUR MUSCLES = BETTER HEALTH.

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