ENT (Otorhinolaryngology) · MU Sofia

31. Clinical anatomy of the neck.

Covers the surface landmarks of the neck, such as the hyoid, thyroid and cricoid cartilages and sternocleidomastoid, then the layers of deep cervical fascia and the carotid sheath. It goes on to the anterior and posterior triangles with their boundaries and contents, the thyroid gland and major vessels, lymphatic drainage, and the cranial nerves and cervical sympathetic chain. Clinical points include the infection spread route, nodal patterns and signs of nerve injury, with Horner's syndrome set out as a list.

Inside: 7 sections · 2 labelled pictures · 14 flashcards · 5 min

Topic 31 of 52 in the MU Sofia syllabus for ENT (Otorhinolaryngology) (Medicine, Year 4). The free AceMed note covers it in 7 sections, about 665 words (5 min of reading), with 14 flashcards.

In this note

  1. Clinical anatomy of the neck
  2. Surface anatomy and landmarks
  3. Fascial Layers
  4. Triangles of the neck
  5. Major Organs and Structures
  6. Lymphatic drainage
  7. Nerves of the neck

Surface anatomy and landmarks

  • Hyoid bone (C3): Divides suprahyoid and infrahyoid neck, with swallowing → helps locate pharynx & larynx
  • Thyroid cartilage (C4–C5): “Adam’s apple” (laryngeal prominence)
  • Cricoid cartilage (C6): Only complete ring of airway
  • Level where: Larynx ends, Trachea begins and Pharynx becomes esophagus
  • Sternocleidomastoid (SCM): Divides neck into anterior and posterior triangles
  • Suprasternal notch: Jugular venous pulsation assessment
  • Clavicle: Separates neck from thorax
  • Clinical importance: Used for tracheostomy, thyroid surgery, lymph node examination, airway access.

Fascial Layers

A. Superficial Cervical Fascia: Lies just deep to the skin. Contains the Platysma muscle, superficial veins, and cutaneous nerves.

B. Deep Cervical Fascia

Divided into three distinct layers:

  1. 1. Investing Layer: Surrounds the entire neck. It splits to enclose the Sternocleidomastoid (SCM) and Trapezius muscles, and the Submandibular and Parotid glands.
  2. 2. Pretracheal Layer:
  • Visceral part: Encloses the thyroid gland, trachea, and esophagus.
  • Muscular part: Encloses the infrahyoid (strap) muscles.
  1. 3. Prevertebral Layer: Surrounds the vertebral column and deep neck muscles (Scalenes). It forms the the danger space behind alar fascia → spreads infection to posterior mediastinum

C. The Carotid Sheath

  • Common/Internal Carotid Artery (Medial)
  • Internal Jugular Vein (Lateral)
  • Vagus Nerve (CN X) (Posterior, in the "groove" between the vessels)

Clinical Note: The Retropharyngeal Space (between the buccopharyngeal fascia and prevertebral fascia) is a "highway" for infection to spread from the pharynx down into the Superior Mediastinum.

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