Rectus capitis posterior major

Musculus rectus capitis posterior major · Velký zadní přímý sval hlavy

Muscles

Looks like

A triangular muscle at the back of the upper neck, from the spine of the second neck vertebra up to the back of the skull.

Tilts the head back and turns it to the same side.

Part of the suboccipital group, whose tension contributes to headaches at the back of the head; posture breaks and gentle stretching help.