The investing layer of deep cervical fascia is the most superficial part of the deep cervical fascia, and encloses the whole neck.

It is considered by some sources to be incomplete[1] or nonexistent.

[2] It surrounds the neck like a collar, it splits around the sternocleidomastoid muscle and the trapezius muscle.

It is attached as; This article incorporates text in the public domain from page 388 of the 20th edition of Gray's Anatomy (1918)