AN35.1-10 | Deep structures in the neck — Summary & Reflection

REFLECT

A 50-year-old male smoker presents with a 6-week history of hoarseness and a painless firm right supraclavicular lymph node. Chest X-ray shows a right apical mass.

What structures might the apical mass be compressing? What is the likely diagnosis? Why is the supraclavicular node involved? If the hoarseness is from the right recurrent laryngeal nerve, where exactly is the nerve involved — and how does this differ from the left-sided anatomy? What fascial space would you drain if this patient developed a retropharyngeal collection?

KEY TAKEAWAYS

Deep Structures in the Neck — Key Points:

1. Deep cervical fascia layers: investing (encloses SCM + trapezius), pretracheal visceral (tethers thyroid to trachea → moves on swallowing), prevertebral (axillary sheath), carotid sheath (CCA + IJV + CN X + ansa cervicalis)
2. Fascial spaces: retropharyngeal (→ danger space → posterior mediastinum); Ludwig's angina from submandibular space
3. Thyroid: relations — RLN in tracheo-oesophageal groove, inferior thyroid artery crosses RLN (variable); parathyroids on posterior surface; inferior thyroid veins drain to brachiocephalic
4. Subclavian artery: 3 parts relative to scalenus anterior; Part 1 gives vertebral + internal thoracic + thyrocervical trunk; Part 2 gives costocervical trunk
5. IJV: in carotid sheath lateral to CCA; drains to brachiocephalic with subclavian vein
6. Cervical sympathetic chain: superior/middle/inferior ganglia; Horner = ptosis + miosis + anhidrosis (sympathetic interruption)
7. RLN: right loops under subclavian; left loops under aortic arch — both ascend in tracheo-oesophageal groove → injury in thyroid surgery
8. Cervical rib: compresses lower trunk (C8, T1) → wasting of intrinsic hand muscles; vascular TOS from subclavian artery compression
9. Cervical lymph nodes: Levels I–VI; jugulodigastric = tonsil; Virchow's = gastric/lung cancer