Deep Fascia of the Neck

Surrounds the neck like a collar and consists of four parts:

1- Investing Layer
Splits around Trapezius and Sternocleidomastoid muscle
Attachments:
Anteriorly, to the hyoid bone.
Posteriorly, it blends with Ligamentum nuchae.
Superiorly, to the lower border of the mandible, mastoid process, superior nuchal line and external occipital protuberance.
Inferiorly, to acromion, spine of the scapula, clavicle and manubrium of the sternum.

Between the angle of Mandible and styloid process the fascia splits to enclose the parotod gland. The posterlayer forms the stylomandiblar ligament


2- Prevertebral
Firm tough memebrane that lies in front of the prevertebral muscles
extends laterally in front of the scalenus anterior, medius and levtor scapulae
Fadesbehind Trapezius muscle.

3- Pretracheal
Lies deep to the infrahyoid muscles
Splites to enclose the thyroid gland and attaches to the second, third, and fourth tracheal rings.

4- Carotid Sheath
Surrounds the common carotid artery, internal carotid artery, internal jugular vein and vagus nerve. Attaches superiorly to the base of the skull and inferiorly blends with the adventitia of the aortic arch.