The deep cervical fascia (or fascia colli in older texts) lies under cover of the Platysma, and invests the neck; it also forms sheaths for the carotid vessels, and for the structures situated in front of the vertebral column. Its attachment to the hyoid bone prevents the formation of a dewlap.
The investing portion of the fascia is attached behind to the ligamentum nuchæ and to the spinous process of the seventh cervical vertebra.
The alar fascia is a portion of the deep cervical fascia.
Read more about Deep Cervical Fascia: Superior Attachments and Relations, Inferior Attachments and Relations, Processes
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