Learning Objective:
By the end of this article, students will be able to describe the lymphatic drainage of the head and neck, identify the major lymph nodes and vessels, and understand their clinical significance.
Lymphatic Drainage of the Head and Neck
The lymphatic system is a network of vessels and nodes that drains lymph from tissues and returns it to the circulation. In the head and neck, lymphatic drainage is organized into superficial and deep pathways.
Lymphatic Vessels
1. Superficial Vessels
- Drain lymph from the scalp, face, and superficial neck.
- Collect into a superficial ring of lymph nodes around the junction of the head and neck.
2. Deep Vessels
- Arise from the deep cervical lymph nodes.
- Converge to form the jugular lymphatic trunks:
- Left jugular trunk → joins the thoracic duct → drains into the left subclavian vein.
- Right jugular trunk → forms right lymphatic duct → drains into right subclavian vein.
Lymph Nodes
A. Superficial Lymph Nodes
Form a ring that drains the scalp, face, and superficial neck before emptying into deep nodes:
| Node | Location | Drains From |
|---|---|---|
| Occipital | Posterior head, lateral border of trapezius | Posterior scalp |
| Mastoid (Post-auricular) | Posterior to the ear, near the SCM insertion | Posterior neck, upper ear, external auditory meatus |
| Pre-auricular | Anterior to ear | Face, temporal region |
| Parotid | Superficial to the parotid gland | Nose, nasal cavity, external ear canal, lateral orbit |
| Submental | Superficial to mylohyoid | Central lower lip, floor of mouth, apex of tongue |
| Submandibular | Below mandible | Cheeks, lateral nose, lips, gums, anterior tongue; receives submental & facial nodes |
| Facial | Along the facial artery | Nose, cheek, eyelids, conjunctiva |
| Superficial Cervical | Along the anterior/posterior jugular veins | Anterior/posterior neck surfaces |
B. Deep Cervical Lymph Nodes
- Receive lymph from all superficial and deep head/neck regions.
- Located along the internal jugular vein within the carotid sheath.
- Divided into superior and inferior deep cervical nodes, including:
- Prelaryngeal, pretracheal, paratracheal
- Retropharyngeal, infrahyoid
- Jugulodigastric (tonsillar), jugulo-omohyoid
- Supraclavicular nodes
Clinical Relevance
Virchow’s Node
- Located in the left supraclavicular fossa.
- Enlargement (Troisier’s sign) may indicate abdominal malignancy, particularly gastric cancer.
Waldeyer’s Ring
- Lymphatic tissue around the superior pharynx protects against ingested/inhaled pathogens.
- Components:
- Lingual tonsil – posterior tongue base
- Palatine tonsils – lateral oral cavity
- Tubal tonsils – near Eustachian tube openings
- Pharyngeal tonsil (adenoid) – nasopharynx roof
Clinical Note:
- Tonsillitis – infection of the palatine tonsils, often with enlarged jugulodigastric nodes.
- Tonsillectomy – surgical removal, usually bleeding controlled via the external palatine vein and tonsillar branch of the facial artery.
- Peritonsillar abscess (quinsy) – may displace the uvula; treated by drainage and antibiotics.
Lymphatics of the Brain
- Previously thought absent, lymphatic vessels have been identified in the brain (2015) in humans and mice.
- Research is ongoing to fully map their anatomy and function.
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