Axial T2 MRI image that demonstrates the muscle layers of the cervical spine of a 40-year-old asymptomatic woman at C5/C6 level. MRI: magnetic resonance imaging; LCA: longissimus capitis; LC: longus colli; LS: levator scapulae; MU: multifidus; SCA: scalenus anterior; SC: splenius capitis; SMC: semispinalis capitis; SCM: sternocleidomastoid; SMCe: semispinalis cervicis; T: trapezius.