Vessel
Inferior thyroid artery
Thyrocervical branch with variable laryngeal nerve relations
High-yield
The recurrent laryngeal nerve can pass in front of, behind or between arterial branches. No single arrangement or fixed percentage reliably describes an individual neck.
Overview
This artery usually rises from the thyrocervical trunk and turns medially behind the carotid sheath toward the thyroid. Its glandular branches also provide much of the parathyroid blood supply. Both its course and its relationship to the recurrent laryngeal nerve vary.
Reference facts
- Origin
- Usually the thyrocervical trunk of the subclavian artery; alternative origins and absence occur.
- Course
- Ascends near the anterior scalene region, then curves medially behind the carotid sheath toward the posterior thyroid; relations to the sympathetic trunk vary.
- Branches
- Glandular, inferior laryngeal, tracheal, esophageal and pharyngeal branches; the ascending cervical artery commonly arises from it.
- Supplies
- Thyroid and parathyroid tissue, with branches to adjacent airway, pharynx, esophagus and cervical tissues.
- Drains to
- After capillary exchange, thyroid blood enters thyroid veins, including inferior veins toward the brachiocephalic veins. The artery itself does not drain into a vein.
Clinical correlation
The close nerve and parathyroid relationships explain why injury in this region can affect vocal-fold movement or calcium regulation. They do not provide a universally safe place to divide the artery.
Frequently asked questions
Where does the inferior thyroid artery originate?
Usually the thyrocervical trunk of the subclavian artery; alternative origins and absence occur.
What does the inferior thyroid artery supply?
The inferior thyroid artery supplies the thyroid and parathyroid tissue, with branches to adjacent airway, pharynx, esophagus and cervical tissues.
Where does the inferior thyroid artery drain to?
After capillary exchange, thyroid blood enters thyroid veins, including inferior veins toward the brachiocephalic veins. The artery itself does not drain into a vein.
What are the branches of the inferior thyroid artery?
Glandular, inferior laryngeal, tracheal, esophageal and pharyngeal branches; the ascending cervical artery commonly arises from it.