Human Anatomy
Head and Neck: Joints, Development, Radiography and Surface Marking
Head and neck integration for MBBS: joints, pharyngeal arch derivatives, thyroid development, surface marking and radiographs, mapped to NMC codes AN43.1 to AN43.9.
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Head and Neck: Joints, Development, Radiography and Surface Marking
Head and neck integration for MBBS: joints, pharyngeal arch derivatives, thyroid development, surface marking and radiographs, mapped to NMC codes AN43.1 to AN43.9.
This head and neck integration chapter brings together the joints of the region, the development of pharyngeal arch derivatives, the surface markings used at the bedside and the reading of radiographs. It ties first-year anatomy to the developmental anomalies and imaging seen in the clinic.
High-yield: Head and Neck: Joints, Development, Radiography and Surface Marking
- The temporomandibular joint is a synovial joint with an articular disc dividing it into upper and lower compartments.
- The atlanto-occipital joint permits nodding of the head, the yes movement.
- The atlantoaxial joint permits rotation of the head, the no movement, around the odontoid process.
- The pharyngeal arches give rise to specific structures, each with its own artery, nerve and cartilage.
- The first pharyngeal arch forms the muscles of mastication and is supplied by the mandibular nerve.
- The second pharyngeal arch forms the muscles of facial expression and is supplied by the facial nerve.
- The thyroid gland develops from the foramen caecum and descends through the thyroglossal duct.
- A persistent thyroglossal duct can form a midline cyst that moves on protruding the tongue.
- Branchial cysts and fistulae arise from remnants of the pharyngeal clefts and pouches.
- The parotid gland surface marking helps locate the parotid duct opposite the upper second molar.
- On a lateral skull radiograph the sella turcica outlines the pituitary fossa.
- The mastoid air cells are seen on radiographs and are clinically important in the spread of ear infection.
- Surface markings of the common carotid bifurcation and the accessory nerve guide safe neck surgery.
- The cervical vertebrae and their soft tissues are assessed on lateral neck radiographs for airway and prevertebral swelling.
Pharyngeal arch derivatives
- **First arch:** Muscles of mastication, mandible. Nerve is the mandibular division of the trigeminal.
- **Second arch:** Muscles of facial expression, stapes. Nerve is the facial nerve.
- **Thyroid development:** Descends from the foramen caecum along the thyroglossal duct. A remnant may form a midline cyst.
- **Key joints:** Temporomandibular for chewing, atlanto-occipital for nodding, atlantoaxial for rotation.
NMC competencies in this chapter
- **AN43.1:** Joints of the head and neck including the temporomandibular joint
- **AN43.2:** Development of the pharyngeal arches and their derivatives
- **AN43.3:** Development of the thyroid gland and thyroglossal duct
- **AN43.4:** Development of the face and palate and related anomalies
- **AN43.6:** Histology of structures in the head and neck
- **AN43.7:** Surface marking of important structures in the head and neck
- **AN43.8:** Radiographs of the skull and neck
- **AN43.9:** Applied anatomy of head and neck development
Frequently Asked Questions
Why does a thyroglossal cyst move on protruding the tongue?
The thyroglossal duct runs from the foramen caecum of the tongue to the thyroid, so a persistent remnant stays attached to the tongue base and moves when the tongue is stuck out.
What movements do the upper neck joints allow?
The atlanto-occipital joint allows nodding, the yes movement, while the atlantoaxial joint allows rotation of the head, the no movement, around the odontoid process.
Why are pharyngeal arches important?
Each arch has its own nerve, artery and muscle group, so knowing the derivatives explains congenital anomalies and the nerve supply of head and neck muscles.
How does this chapter help in NEET-PG?
Pharyngeal arch development, thyroglossal and branchial anomalies and neck radiographs are tested in surgery, ENT and paediatrics, keeping this integration high-yield.
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