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Nuchal ligament

The nuchal ligament (ligamentum nuchae) is a strong, midline ligament in the posterior cervical region that extends from the external occipital protuberance and median nuchal line of the skull to the spinous process of the seventh cervical vertebra (C7). It provides posterior support to the cervical spine, serves as an attachment for muscles, and limits hyperflexion of the neck. Understanding its anatomy, function, and imaging appearance is essential for radiologists, spine surgeons, and sports medicine specialists, particularly in trauma, degenerative disease, or ligamentous injury.

Synonyms

  • Ligamentum nuchae

  • Posterior cervical ligament

  • Median cervical ligament

  • Nuchal fibrous ligament

Function

  • Provides posterior support to the cervical spine

  • Restricts excessive neck flexion, protecting the cervical vertebrae

  • Serves as an attachment site for trapezius, splenius capitis, and rhomboid minor muscles

  • Helps maintain cervical posture and transmits muscular forces across the neck

MRI Appearance
T1-weighted images:

  • The nuchal ligament appears as a linear, low-signal intensity structure posterior to the cervical spinous processes.

  • Surrounded by intermediate-to-high signal subcutaneous fat, providing clear contrast.

  • Thickening, tears, or degenerative changes appear as areas of increased signal within the normally hypointense ligament.

T2-weighted images:

  • The ligament is typically low signal, with adjacent fat remaining hyperintense.

  • Edema, partial tears, or inflammation appear hyperintense, highlighting pathology.

  • Useful for evaluating ligamentous injury or post-traumatic changes.

STIR (Short Tau Inversion Recovery):

  • Suppresses fat signal, making any edema or ligamentous injury clearly hyperintense.

  • Normal nuchal ligament remains low signal.

CT Appearance

  • On non-contrast CT, the nuchal ligament is soft tissue density, usually difficult to distinguish unless thickened or calcified.

  • Appears as a thin band posterior to the spinous processes of the cervical vertebrae.

  • Calcifications or ossification within the ligament appear hyperdense.

  • Useful for evaluating post-traumatic changes, calcification, or ossification in the posterior cervical region.

MRI images

nuchal ligament axial mri image -img-00000-00000