Vascular & Lymphatic Supply of the Head and Neck — INBDE Review
External carotid branches, venous drainage, and lymph node groups for dental practice — including the danger triangle and tooth-specific lymphatic drainage. 11 board-style MCQs.
Concept summary & clinical relevance.
Quick-reference structure first, then nerve-by-nerve detail. Mnemonics in amber, clinical pearls in blue.
Vascular and lymphatic anatomy of the head and neck is what underlies hemorrhage control during oral surgery, the danger of facial-vein infections spreading to the cavernous sinus, and the patterns by which oral cancers metastasize. Three systems carry three jobs: arteries deliver, veins remove, lymphatics screen.
| Branch | Supplies | Dental relevance |
|---|---|---|
| Superior thyroid | Thyroid gland, larynx | Vascular landmark in neck dissection |
| Ascending pharyngeal | Pharynx, soft palate | Deep neck infection spread |
| Lingual | Tongue, floor of mouth | Hemorrhage during tongue/floor surgery |
| Facial | Upper & lower lip, cheek, nose | Bleeding source in facial trauma |
| Occipital | Posterior scalp | — |
| Posterior auricular | Behind the ear | — |
| Maxillary (terminal) | Deep face, jaws, teeth (via PSA, IAA, MSA, ASA) | All major dental arteries originate here |
| Superficial temporal (terminal) | Scalp, temple | Pulse landmark; near TMJ |
| Structure | First-stop nodes | Final |
|---|---|---|
| Tip of tongue, mandibular incisors, lower lip, chin | Submental | Deep cervical |
| Most teeth (except mandibular incisors & 3rd molars), tongue body, floor of mouth | Submandibular | Deep cervical |
| Maxillary 3rd molars, soft palate, pharynx | Retropharyngeal | Deep cervical |
| Lateral scalp, parotid region, external ear | Parotid (preauricular) | Deep cervical |
| All routes converge | — | Deep cervical chain (along IJV) |
Arterial supply
- Common carotid artery splits at C4 into internal (intracranial → brain + eye) and external (extracranial → face, mouth, jaws) carotid arteries.
- Maxillary artery is the terminal branch of the ECA and the parent of every major dental artery: posterior superior alveolar (maxillary molars), middle/anterior superior alveolar (maxillary premolars/anteriors), and inferior alveolar (mandibular teeth).
- Lingual artery → tongue and floor of mouth — primary hemorrhage risk in tongue surgery.
- Facial artery → upper and lower lips, cheek, nose; palpable at the inferior border of the mandible anterior to the masseter.
Venous drainage
- Internal jugular vein is the main outflow for both brain and face; runs alongside the carotid sheath.
- Facial vein anastomoses with the cavernous sinus via the superior and inferior ophthalmic veins — the route for the danger-triangle warning.
- Pterygoid venous plexus surrounds the lateral pterygoid muscle; an inferior alveolar nerve block can produce a hematoma here if the IAN injection is too posterior.
Lymphatic drainage
- Submental nodes: tip of tongue, chin, lower lip, mandibular incisors.
- Submandibular nodes: most teeth (except mandibular incisors and 3rd molars), tongue body, floor of mouth.
- Retropharyngeal nodes: maxillary 3rd molars, soft palate, posterior pharynx — drains forward to deep cervical.
- Deep cervical chain (along IJV): final collection point for all head and neck lymph; the primary site for oral cancer metastasis.
11 board-style MCQs.
Active recall is the highest-yield study method for the INBDE. Pick an answer, check it, and read why every distractor is wrong — that's where the learning compounds.
The MCQs above are Core Recall — testing what you've memorized. The book adds a full Clinical Integration set: board-style patient scenarios where you apply this anatomy to real clinical reasoning. That's the section the INBDE actually weights heaviest.
- Question 1EasyWhich artery is the main supplier of the face, oral cavity, and jaws?
- Question 2EasyThe lingual artery, a branch of the external carotid, primarily supplies which structure?
- Question 3EasyWhich branch of the external carotid artery supplies blood to the upper lip and nose?
- Question 4ModerateWhich artery is the terminal and largest branch of the external carotid artery?
- Question 5ModerateThe posterior superior alveolar artery, which supplies the maxillary molars, is a branch of which main artery?
- Question 6EasyWhich vein is the main drainage route for the brain and face into the systemic circulation?
- Question 7ModerateInfections in the “danger triangle” of the face can spread to the brain due to venous connections with which structure?
- Question 8EasyWhich lymph nodes first drain the tip of the tongue and mandibular incisors?
- Question 9ModerateThe maxillary 3rd molars usually drain into which lymph nodes?
- Question 10ModerateWhich artery primarily supplies the thyroid gland?
- Question 11ModerateWhich artery enters the mandibular foramen to supply mandibular teeth?
900 INBDE-style MCQs with full explanations across 18 chapters — Core Recall plus board-style Clinical Integration scenarios — alongside Learning Summaries, Integration Bridges, and Review Boxes. Built by Dr. Isaac Sun for dental students who want to think like a clinician, not just memorize.
Founder, KYT Dental Services · Author, KYT INBDE series. These MCQs and Learning Summaries are part of a structural-thinking framework Dr. Sun uses with patients in the chair.