Posterior triangle and root of neck

The prevertebral layer


  • Base of the skull
  • Transverse process of cervical vertebrae
  • Extends further down into the abdomen



Structures covered
  • Prevertebral muscles
  • Scalene muscles
  • Phrenic nerve

Thus, it covers the floor of the posterior triangle of the neck

  • In front of the subclavian artery, it is prolonged laterally as the cervico-axillary(axillary) sheath which invests the brachial pexus and the vessels.

  • The carotid sheath said to be derived from fusion or pretracheal and prevertebral fascia. Surrounds the

    •  Common and the internal carotid arteries.

    •  Internal jugular vein

    •  vagus nerve