Cervical lymph nodes are spread throughout the neck, arranged in a chain that runs from just below the chin down to the collarbone. There are roughly 300 lymph nodes in the neck, grouped into specific levels based on their position relative to key muscles and bones. Understanding where they sit helps you know what you’re feeling when a node swells up during an illness or infection.
The Two Main Layers: Superficial and Deep
Cervical lymph nodes are organized into superficial and deep groups, separated by the layers of muscle in your neck. The superficial nodes sit closer to the skin, running alongside the external jugular vein on the side of the neck and the anterior jugular vein in front. These are the ones you’re most likely to feel when they swell.
The deep cervical nodes are clustered around the internal jugular vein, a large vessel that runs deep beneath the sternocleidomastoid muscle (the thick muscle you can see and feel running from behind your ear down to your collarbone). These deep nodes handle the bulk of lymphatic drainage from the head and neck. To expose them during surgery, the sternocleidomastoid muscle and the thin platysma muscle beneath the skin must be moved aside.
Neck Levels I Through VI
Doctors and radiologists divide the cervical lymph nodes into numbered levels, each corresponding to a specific zone of the neck. Two bones serve as the primary dividing landmarks: the hyoid bone (the small U-shaped bone in the upper neck, roughly at the level of your chin) and the cricoid cartilage (the ring of cartilage you can feel at the base of your throat, just below the Adam’s apple).
Level I: Under the Chin and Jaw
Level I sits in the uppermost part of the neck, between the chin and the hyoid bone. It splits into two subgroups. Level Ia (submental nodes) are tucked directly under the chin, centered between the two sides of the jaw. Level Ib (submandibular nodes) sit further back, nestled around the submandibular gland just beneath the angle of the jawbone. These nodes drain the floor of the mouth, the lower lip, the tip of the tongue, and the front teeth. If you’ve ever felt a tender lump under your jaw during a cold or dental infection, it was likely a Level I node.
Levels II, III, and IV: Along the Jugular Vein
These three levels form the deep cervical chain, running vertically down the side of the neck alongside the internal jugular vein. They’re divided by the hyoid bone and the cricoid cartilage:
- Level II (upper jugular) runs from behind the ear down to the hyoid bone. These nodes sit high on the neck, just below the base of the skull, tucked under the upper portion of the sternocleidomastoid muscle. They receive drainage from the mouth, nasal cavity, throat, and ear.
- Level III (middle jugular) spans from the hyoid bone down to the cricoid cartilage, covering the middle third of the neck. These nodes sit along the middle section of the sternocleidomastoid.
- Level IV (lower jugular) extends from the cricoid cartilage down toward the collarbone, ending about 2 centimeters above the sternoclavicular joint (where the collarbone meets the breastbone). A separate subgroup, Level IVb, sits even deeper near the base of the neck, close to major blood vessels and the top of the lung.
Level V: The Posterior Triangle
Level V nodes occupy the posterior triangle of the neck, a space defined by three borders: the sternocleidomastoid muscle in front, the trapezius muscle in back, and the middle third of the collarbone at the bottom. These three structures form a visible triangle on the side of your neck, and the nodes within it include the occipital, transverse cervical, and supraclavicular chains. Level V nodes drain the back of the scalp, the skin of the neck, and parts of the shoulder.
Level VI: The Front of the Throat
Level VI nodes are positioned in the central front of the neck, between the hyoid bone above and the top of the breastbone below. They sit between the two carotid arteries on either side. This group includes nodes directly in front of the larynx (voice box) and trachea (windpipe), making them particularly relevant for thyroid and laryngeal conditions.
How to Feel Them on Yourself
You can locate many cervical lymph nodes through simple palpation. Start under your chin with your fingertips, pressing gently upward into the soft tissue. Slide your fingers back along the underside of the jawbone to find the submandibular nodes. Then move to the side of the neck: place your fingers on the sternocleidomastoid muscle (turn your head to the opposite side and it will pop out) and press gently along its length from just below the ear to the collarbone. The deep jugular nodes (Levels II through IV) sit beneath and alongside this muscle.
For the posterior triangle, feel behind the sternocleidomastoid toward the trapezius muscle at the back of your neck. Finally, press gently into the hollow just above the collarbone on each side for the supraclavicular nodes. Healthy lymph nodes are small, soft, and usually not noticeable. When you can feel them easily, they’re typically swollen.
Normal Size and What “Enlarged” Means
Normal cervical lymph nodes measure between about 2 and 8 millimeters across their short axis, depending on location. Submandibular and submental nodes tend to be slightly larger than those along the jugular chain. The widely used threshold for concern is 10 millimeters in the shortest diameter on imaging. A node measuring above that cutoff doesn’t automatically mean something serious, but it prompts closer evaluation.
Shape matters as much as size. Healthy nodes are typically oval, like a kidney bean, with a long axis noticeably greater than the short axis. On ultrasound, about 83% of benign nodes have this oval shape. Nodes that become rounder (approaching a 1:1 ratio between short and long axes) are more likely to be abnormal. A short-to-long axis ratio of 0.67 or higher is one cutoff radiologists use, though it’s just one piece of the puzzle alongside border regularity and internal structure.
Why the Supraclavicular Node Gets Special Attention
One cervical lymph node carries particular clinical weight: Virchow’s node, a left supraclavicular node sitting in the hollow just above the left collarbone. It lies deep to the sternocleidomastoid muscle, resting over the scalene muscle at the base of the neck. This node is the endpoint of the thoracic duct, the body’s largest lymphatic vessel, which drains lymph fluid from the abdomen, pelvis, and chest.
Because of this drainage pathway, a hard, painless, enlarged node in this specific spot can signal cancer originating far from the neck, particularly gastric (stomach) cancer. German pathologist Rudolf Virchow first described this association in 1848. An important distinction: when a supraclavicular node swells due to infection, it’s usually painful or tender. When it enlarges from metastatic cancer, it’s typically painless and firm. Enlargement can occur on either side, but it’s more common on the left because that’s where the thoracic duct empties.
What Each Region Drains
Cervical lymph nodes don’t just sit passively in the neck. They filter lymph fluid from specific territories of the head, face, and throat. The pattern follows a logical top-to-bottom flow. The submental and submandibular nodes (Level I) collect fluid from the mouth floor, lower lip, and front of the tongue. The upper jugular nodes (Level II) receive drainage from the oral cavity, nasal passages, pharynx, and ear. The middle and lower jugular nodes (Levels III and IV) act as secondary filters, receiving fluid that has already passed through higher nodes, plus direct drainage from the larynx and thyroid.
The posterior triangle nodes (Level V) handle the back of the scalp, the skin of the lateral neck, and portions of the nasopharynx. The anterior midline nodes (Level VI) filter fluid from the thyroid gland, larynx, and trachea. This organized drainage system is why the location of a swollen node can point directly to the source of a problem. A swollen node under the jaw often traces back to a dental issue or throat infection, while a swollen node low on the neck near the collarbone warrants a broader investigation.