Anatom3DSemispinalis capitis
Musculus semispinalis capitis · Polotrnový sval hlavy
Muscles
Looks like
A large thick muscle forming the rope-like bulge either side of the back of the neck, from the upper chest and neck vertebrae to the back of the skull.
What it does
Pulls the head back and holds it up against gravity.
Keeping it well
Tight with forward head posture and a source of headaches; the greater occipital nerve pierces it.