The investing layer of deep cervical fascia splits to enclose all of the following, except:
The investing layer of deep cervical fascia splits to enclose:

Muscles—trapezius and sternocleidomastoid.
Salivary glands— parotid and submandibular glands.
Spaces— suprasternal and supraclavicular spaces.
Parotid and submandibular glands
Sternocleidomastoid and vertebral arteries
Trapezius and sternocleidomastoid muscles
Suprasternal and supraclavicular spaces