Head and neck lymphatics

Pericervical Collar - The Head's First Filter

This ring of superficial lymph nodes at the junction of the head and neck provides the initial lymphatic drainage for the face and scalp. All eventually drain into the deep cervical chain.

• Occipital: Drains the posterior scalp and neck.
• Mastoid (Post-auricular): Drains the posterolateral scalp and auricle.
• Parotid (Pre-auricular): Drains the anterior scalp, eyelids, and external ear.
• Submandibular: Drains the cheeks, nose, lips, gums, and body of the tongue.
• Submental: Drains the chin, central lower lip, and tip of the tongue.

⭐ The tip of the tongue drains bilaterally to the submental nodes, a key exception to the general rule of ipsilateral drainage.

Superficial Cervical Nodes - The Jugular Pathway

• Location: Lie along the external jugular vein (EJV), superficial to the sternocleidomastoid (SCM) muscle.
• Afferents (Inflow):
  • Drains the inferior parotid region, skin over the angle of the jaw, and the lower ear.
  • Receives efferents from occipital and mastoid nodes.
• Efferents (Outflow):
  • Pierces the deep cervical fascia to drain into the superior and inferior deep cervical nodes.

⭐ These nodes are frequently palpable in infections of the scalp or skin of the neck (e.g., cellulitis), serving as an important early clinical sign.

Deep Cervical Chain - The Central Sink

• The final common drainage pathway for the entire head and neck. A vertical chain of nodes located along the internal jugular vein, deep to the sternocleidomastoid muscle.
• Receives lymph from all other superficial and deep node groups.

• Jugulodigastric Node: Located where the posterior belly of the digastric crosses the IJV. Drains the palatine tonsils and posterior tongue.
• Jugulo-omohyoid Node: Located where the omohyoid muscle crosses the IJV. Drains the anterior tongue.

⭐ Virchow's Node (or supraclavicular node) is the most inferior deep cervical node. Its enlargement (Troisier's sign) is classically associated with metastatic gastric carcinoma.

Terminal Drainage - The Great Escape

All head & neck lymph ultimately drains via the deep cervical nodes into the right lymphatic duct or the thoracic duct, returning to the bloodstream.

⭐ The thoracic duct drains the left side of the head/neck, the entire body below the diaphragm, and the left upper limb/thorax. Its terminus near the left venous angle is a common site for metastasis from distant tumors (e.g., Virchow's node).

High‑Yield Points - ⚡ Biggest Takeaways

• Most head and neck lymph ultimately drains to the deep cervical nodes, which run along the internal jugular vein.
• The jugulodigastric node is the primary drainage site for the palatine tonsils and posterior tongue.
• Submental nodes drain the tip of the tongue, floor of the mouth, and the central lower lip.
• Submandibular nodes drain the face, sinuses, and lateral parts of the tongue.
• Lymph eventually enters venous circulation via the thoracic duct or right lymphatic duct.