INFECTIONS OF THE NECK:
Netter Plate Number: 30

Superficial space of the neck:
This space is superficial to the superficial layer of the deep cervical fascia. This layer is involved with cellulitis and superficial abcesses. Infections are drained by superficial incisions along Langer's lines followed by antibiotic treatment.

Retropharyngeal space:
This potential layer exists posterior to the deep layer of the deep cervical fascia (buccopharyngeal fascia), and anterior to the Alar fascia. It extends from the skull base to the level of T1-T2.

The "Danger" space:
This space is noted in this diagram as the anatomical retropharyngeal space, with the Alar fascia forming the anterior border and the prevertebral fascia noted posteriorly.
This space is referenced as the danger space as it extends from the skull base to the diaphragm, allowing for infections to spread the entire distance.

Prevertebral space:
This space is bordered anteriorly by the prevertebral fascia, and the vertebral bodies and deep neck muscles posteriorly. This space extends down the entire length of the vertebral column.

Carotid Sheath:
This space is known as the "Lincoln Highway". As these fascial layers are continuations of other layers, this space can become secondarily involved with any other deep neck infection by direct spread.

*See Fascial layers of the neck.