The<unk>  (or<unk>  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<unk>  is attached behind to the ligamentum nuchæ and to the spinous process of the seventh<unk>  vertebra.
The alar<unk>  is a portion of the<unk> .
Deep cervical fascia
Crural fascia
Inguinal ligament
Dorsum 
Interspinous plane
Ganglion impar
Fibrous pericardium
Broad ligament of the uterus