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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 spreading out towards your shoulders and then extending down the back for left and right trapezii to meet as a point mid-back, level with the last ribs. A large blanket of muscle over the back of the upper body, kite/diamond shaped.
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 attach to the spine via the nuchal & supraspinous ligaments and are responsible for the alignment of the upper body.

nuchal & 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 depending on the direction of the muscle fibres. So between both trapezii there are 6 sections in total. Picture them in your mind starting with the lower trapezius activating from its base extending upwards and outwards. The middle trapezius bands of muscle tissue from midline to the shoulders, free to fully extend.

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 showing the attachments of the upper trapezius portion of the muscle. The uppermost attachment is to the base of the skull, a linear attachment with the external occipital protuberance on the midline. The trapezius muscles drop down from the skull and extend out towards the shoulders, curving and extending forward.  The cervical vertebrae (neck bones) have been removed to reveal the nuchal ligament which is like an odd-shaped triangle of connective tissue, like a blade of connective tissue, that extends from midline between the trapezii into the back of the neck attaching to the cervical vertebrae.  Showing the clavicle/collar bone where the front-most piece of the upper trapezius attaches. The scapula bones and thoracic vertebrae are also shown.

Middle trapezius

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

skeleton and trapezius muscles off-center view from back. The middle trapezius consists of horizontal running fibres extending from midline - the supraspinous ligament and upper thoracic vertebrae - to where the trapezius attaches to the acromion of the scapula.

Attaches to:

  • Spinal processes of the 1st to 4th thoracic vertebrae and the supraspinous ligament.
  • Medial side of the acromion of the scapula (shoulder blade).

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:

  • Spinal processes and the supraspinous ligament of the 5th to 12th (last) thoracic vertebrae.
  • Posterior crest of spine of the scapula (shoulder blade).
  • Deltoid tubercle of spine of the scapula.
Side view of the upper body and trapezius muscles showing the sculpted shape of the upper trapezius and its attachments to the clavicle. The supraspinous ligament and the thoracic vertebrae can be seen, where the left and right lower trapezius meet midline. The trapezius muscles come to a point at the 12th (last) thoracic vertebrae where the bottom ribs emerge.  The fibres of the lower trapezius muscles extend upwards and outwards, like a fan, from the lowest point of the muscles.
2 images showing the bones and ligaments where the trapezius muscles attach. Back view and off-center front view. It looks complicated, the trapezius muscles attach to many structures.  The base of the skull, a linear attachment.  The midline nuchal and supraspinous ligaments and cervical and thoracic vertebrae.  The lateral third of the clavicle. The scapula in multiple sites, the deltoid tubercle, the spine of the scapula, the acromion of the scapula.

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 the 6th (last) cervical vertebrae and the top of the supraspinous ligament to the third thoracic vertebrae.
View from front, looking down. Showing the bones of the upper body, the ribs and pelvis. The left and right trapezius muscles with the nuchal ligament midline. The baseline muscles are also shown, the rectus abdominis up the front of the abdomen, either side of the midline linea alba, and the pelvic floor as the base of the body.  With Base-Line support in place which aligns the lower body, the trapezius muscles correctly align the upper body when free of physical restrictions.

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 and aligning the upper body to Base-Line.

Base-Line muscles

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