State the structures enclosed by the investing layer of cervical fascia

The investing layer of the cervical fascia, also known as the superficial layer, encloses the following structures:

1. Sternocleidomastoid Muscle: This muscle runs along the side of the neck and is responsible for turning the head.

2. Trapezius Muscle: This is a large muscle at the back of the neck and upper spine that helps move and stabilize the shoulder blades.

3. Submandibular Glands: These are salivary glands located beneath the lower jaws.

4. Parotid Glands: These are the largest salivary glands, located in front of the ears and extending to the area beneath the jawbone.

5. Lymph Nodes: These small, bean-shaped structures produce cells that fight infection and disease. They are part of the body's immune system.

6. Neurovascular Bundle: This includes the carotid artery, internal jugular vein, and vagus nerve, which are enclosed together in a sheath.

7. Platysma Muscle: This is a thin muscle in the neck that helps with facial expressions.

8. External and anterior jugular veins: These veins carry deoxygenated blood from the head and neck back to the heart.

Remember, the investing layer of the cervical fascia is the most superficial layer of the deep cervical fascia, and it encloses the entire neck.