The nuchal fascia is a fascia covering the autochthonous musculature of the neck as a part of the cervical fascia. It's a continuation of the posterior layer of the thoracolumbar fasica to cranial. It ensheathes the splenius and semispinalis capitis.
Expanding laterally, the fascia covers the dorsal musculature and blends into the superficial layer of cervical fascia. Anteriorly it blends with the prevertebral layer of cervical fascia.
In the middle of the deeper layer of the nuchal fascia is a bulge called the the nuchal ligament.