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Trapezius
A large flat muscle spanning skull to mid-back, steering the shoulder blade in three different directions depending on which fibres pull.
Latin name: Musculus trapezius. In plain English, the big diamond across the upper back and neck. It is filed here under shoulder and shoulder blade.
Reference information, not a diagnosis. Where a symptom is described below, it is there so you can describe your own more precisely to a clinician — not so you can name what you have.
Where it is
Trapezius is the muscle most people mean when they say their shoulders are tight. It covers the whole upper back as a broad diamond: from the back of the skull and the ligament running down the back of the neck, down the spine as far as the twelfth thoracic vertebra, and outward to the collarbone and shoulder blade. Left and right together make the trapezoid shape that gives it its name.
Its nerve supply is unusual. Motor signals come from the accessory nerve, a cranial nerve that runs a long and superficial course through the side of the neck, which is why neck surgery or a deep neck injury can leave a drooping shoulder blade on one side. Sensation comes separately from the third and fourth cervical nerves.
| Feature | Detail |
|---|---|
| Origin | External occipital protuberance, the medial third of the superior nuchal line, the nuchal ligament, and the spinous processes of C7 to T12 |
| Insertion | Lateral third of the clavicle, the acromion, and the spine of the scapula |
| Nerve | Accessory nerve (cranial nerve XI) for movement, with C3-C4 fibres for sensation |
| Main actions | Upper fibres elevate and help rotate the shoulder blade upward, middle fibres retract it, lower fibres depress it and complete the upward rotation |
What it does
The three parts do opposite things and are meant to work as a team. To raise your arm fully overhead, the shoulder blade has to rotate so the socket points upward — that rotation is produced by the upper and lower fibres pulling together while serratus anterior pulls from the front. The middle fibres pull the shoulder blades toward the spine, the movement you use every time you pull something toward you.
The popular idea that the upper trapezius is overactive and should be switched off is much too simple. The upper fibres carry the weight of the arm all day and are supposed to work. What is more often missing is the lower fibres, which have to hold the shoulder blade down and rotate it as the arm rises. Neck and shoulder ache from long desk hours has more to do with a static position held for hours than with any one muscle being at fault.
Exercises that load it
| Exercise | Category | Muscles the exercise library lists |
|---|---|---|
| Deadlift | Strength | Hamstrings, glutes, back, grip |
| Farmer's carry | Strength | Grip, core, upper back, legs |
| Bent-over row | Strength | Mid-back, lats, biceps |
| Overhead press | Strength | Shoulders, triceps, core |
| Pull-ups | Strength | Lats, biceps, mid-back, grip |
Carrying loads the upper fibres isometrically — a farmer's carry is the most honest upper-trap exercise there is, because the muscle does exactly what it is built for: holding the shoulder girdle up against a weight hanging from it. Rowing loads the middle fibres. Anything overhead loads the lower fibres, provided you let the shoulder blade rotate instead of locking it down. Deadlifting loads all of it, statically, at the top of every rep.
How it is lengthened
For the upper fibres, side-bend the head away from the side you are stretching and let the shoulder drop, then add a small rotation of the head toward the same side; hold gently for around thirty seconds. Do not pull hard on your own head — the neck is not a hinge. For the middle fibres, a reach-across or a rounded-back reach in front lengthens them, though these fibres are more often weak than short.
When it goes wrong
| Problem | What it typically feels like | Usual setting |
|---|---|---|
| Neck and shoulder tension | A dull, band-like ache across the top of the shoulders that builds through a working day | Long static sitting, screen work, stress, or carrying a bag on one side |
| Trapezius strain | A local painful spot that hurts to shrug or turn the head, often after one identifiable moment | A sudden heavy lift, a whiplash-type movement, or sleeping in an odd position |
| Accessory nerve palsy | A shoulder that droops on one side with weakness shrugging and difficulty raising the arm fully overhead | After surgery or injury in the posterior triangle of the neck |
Weakness shrugging on one side, a visibly drooping shoulder, or neck pain with arm numbness or weakness needs a clinical assessment rather than a stretch routine.
Nothing on this page is a treatment plan. If a problem is limiting what you do, is not improving, or is getting worse, the right next step is an assessment by a doctor or a physiotherapist who can examine you.
Sources: descriptive anatomy from Gray's Anatomy of the Human Body, 20th US edition (1918), which is in the public domain; Latin names follow Terminologia Anatomica, published by the Federative International Programme for Anatomical Terminology. Nerve root levels are the conventional ranges taught from those sources and vary between individuals and between textbooks. Exercise cross-links use the TempoLife exercise library. Checked 2026-09-06.
Frequently asked questions
Why are my traps always tight?
Most often because they have been holding one position for a long time rather than because they are short. Muscles that hold a low-level contraction for hours ache. Changing position often, and building strength in the lower fibres so the upper ones are not doing all the work, tends to help more than repeated stretching.
What is the difference between the trapezius and the levator scapulae?
The trapezius is broad and covers the whole upper back; the levator scapulae is a narrow strap running from the upper neck vertebrae to the top inner corner of the shoulder blade, and it sits underneath. Pain right at that inner corner is more often levator scapulae.
Do shrugs make the neck stiff?
Not by themselves. Loading a muscle through its full range is not the same as holding it short all day. Stiffness after training usually reflects unaccustomed volume, and it settles.
Nearby in this reference
Deltoid
The cap of the shoulder
Rotator cuff
The four small muscles that hold the shoulder in its socket
Rhomboids
The straps that pull the shoulder blades together
Serratus anterior
The finger-like muscle on the ribs that pins the shoulder blade down
Biceps brachii
The two-headed muscle at the front of the upper arm
Triceps brachii
The three-headed muscle at the back of the upper arm
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