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
Sternocleidomastoid and vertebral arteries