pharynx

Regional anatomical identity

Record the organism context and evidence supporting identification of the pharynx and its subdivisions.

1. Which species and life stage does this pharynx belong to, and which regional terminology applies? definition
2. Which observed landmarks support identification of each recorded pharyngeal region? provenance

Interface localisation

Record how observations are assigned across the nasal, oral, laryngeal and oesophageal interfaces.

1. Where are the boundaries with the nasal cavity, oral cavity, larynx and oesophagus under the chosen anatomical convention? boundary
2. Does the finding lie within a pharyngeal region, cross an interface or belong primarily to a neighbouring structure? boundary

Regional calibre and contents

Record lumen measurements, asymmetry and observed contents at named locations.

1. At which landmark and under which posture and functional phase was pharyngeal calibre assessed? measurement
2. Is reduced space associated with wall configuration, adjacent compression, secretions, a bolus or another observed occupant? measurement

Local tissue findings

Localise tissue changes without assigning an unsupported cause.

1. Which pharyngeal surfaces show swelling, altered appearance, disrupted integrity or focal lesions, and how extensive are the findings? measurement
2. Which areas were adequately examined, and which remain outside the examination's coverage? provenance

Task-dependent airway behaviour

Describe observed patency or narrowing with the state in which it occurs.

1. Under which breathing phase, posture and wakefulness or sleep state was pharyngeal patency observed? measurement
2. What evidence localises any observed obstruction to the pharynx and identifies the involved region? provenance

Resonance interface behaviour

Record task-specific observations of the pharyngeal contribution to resonance and velopharyngeal behaviour.

1. During which speech or vocalisation task was resonance or velopharyngeal behaviour assessed? measurement
2. Which observations support a pharyngeal contribution, and which require assessment of the palate, nasal cavity or larynx? boundary

Bolus clearance and interface events

Record observed transit, residue and interface events for a specified swallowing assessment.

1. For the assessed bolus consistency and volume, what transit and residue were observed in each pharyngeal region? measurement
2. What evidence documents coordination with velopharyngeal closure, laryngeal protection and opening toward the oesophagus? provenance
3. Which swallowing events were directly observed, and which fall outside the method's coverage? boundary

Symptom localisation confidence

Separate reported throat symptoms from findings demonstrably located in the pharynx.

1. What evidence links reported swallowing difficulty, discomfort or obstruction sensation to a specific pharyngeal region? provenance
2. Which relevant regions or functions remain unassessed despite the reported symptom? boundary

Local action readiness

Record whether evidence, expertise and applicable protocols support a proposed pharyngeal examination or intervention.

1. What localisation, airway and swallowing evidence must a qualified professional review before the proposed action? action
2. Which findings trigger escalation or restrict the action under the applicable clinical protocol? action
3. Which regional tissue and functional observations will establish the local outcome after the action? measurement

Kinds and varieties

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

• Nasopharynx (epipharynx): from the choanae and skull base to the free edge of the soft palate, including the torus tubarius, adenoid bed, and fossa of Rosenmüller
• Oropharynx (mesopharynx): from the soft palate to the level of the hyoid/superior epiglottic margin, including tonsillar fossae, base of tongue, and valleculae
• Laryngopharynx / hypopharynx: from the hyoid/epiglottic level to the inferior cricoid, including piriform sinuses, postcricoid region, and posterior pharyngeal wall
• Velopharynx: the functional sphincter of soft palate plus lateral and posterior walls used in speech and swallow valving, not a TA topographic third
• Embryonic pharyngeal (branchial) apparatus: pouches, arches, and clefts that pattern the neck and middle ear rather than the adult lumen
• Oncologic topography NOS (ICD-O C14.0): pharynx not assigned to C11/C10/C13 when the subsite cannot be determined
• Comparative/invertebrate pharynx: a separately evolved feeding organ (e.g. nematode, planarian) that is not the vertebrate aerodigestive tube

1. Which of these kinds and varieties hold for the sense of pharynx this model covers, and on what evidence? provenance

Identifiers and schemes

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

• Wikidata - Q174778 - Item for the anatomical pharynx.
• FMA - 46688 - Foundational Model of Anatomy class Pharynx.
• UBERON - UBERON:0001042 - Multi-species anatomy ontology class pharynx.
• MeSH - D010614 - National Library of Medicine heading Pharynx.
• SNOMED CT - 54066008 - Pharyngeal structure (body structure); verify in the current International Edition before use in records.
• Terminologia Anatomica (TA98) - A05.3.01.001 - TA code for pharynx; subdivisions occupy the A05.3.01.* series.
• ICD-O-3 topography - C11 (nasopharynx), C10 (oropharynx), C13 (hypopharynx), C14.0 (pharynx, NOS) - Cancer registry site codes, not a single organ code.

1. Which of these identifiers and schemes hold for the sense of pharynx this model covers, and on what evidence? provenance

Standards and regulation

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

• Terminologia Anatomica - Federative International Programme for Anatomical Terminology (FIPAT), International Federation of Associations of Anatomists (IFAA)
• ICD-10 and ICD-11 - World Health Organization (site and disease coding for pharyngeal conditions)
• ICD-O-3 topography and WHO Classification of Head and Neck Tumours - IARC/WHO (tumour site and histology)
• AJCC Cancer Staging System and UICC TNM - American College of Surgeons / Union for International Cancer Control (pharyngeal cancer staging)
• AASM scoring rules and adult OSA diagnostic criteria - American Academy of Sleep Medicine (pharyngeal collapse as the usual obstructive site)
• Radiation-oncology contouring guidance (e.g. RTOG/EORTC/ESTRO head-and-neck atlases) - cooperative trial groups and ESTRO (pharyngeal mucosa and constrictors as targets or organs at risk)

1. Which of these standards and regulation hold for the sense of pharynx this model covers, and on what evidence? provenance

Real-world use

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

• Flexible nasendoscopy and mirror examination in ENT to inspect mucosa, adenoids, eustachian cushions, tonsils, tongue base, and piriform sinuses
• Videofluoroscopic swallow study and FEES to watch bolus transit, velopharyngeal closure, and aspiration risk
• High-resolution pharyngeal manometry in dysphagia laboratories to quantify contractile vigour and upper-oesophageal sphincter relaxation
• Anaesthetic airway: the tube is the path for intubation and the seat of oropharyngeal airways and mask ventilation
• Sleep medicine: retropalatal and retroglossal collapse as the mechanical basis of obstructive sleep apnoea, assessed by drug-induced sleep endoscopy
• Head-and-neck oncology: biopsy, transoral robotic or laser resection, chemoradiotherapy, and laryngopharyngectomy planned by nasopharyngeal, oropharyngeal, or hypopharyngeal subsite
• Speech-language pathology: assessment of velopharyngeal competence after cleft palate or adenoidectomy
• Common operations whose field is a pharyngeal wall: tonsillectomy (oropharynx), adenoidectomy (nasopharynx)

1. Which of these real-world use hold for the sense of pharynx this model covers, and on what evidence? provenance

Typical measurements

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

• Craniocaudal length in the adult human (skull base to cricoid / oesophageal inlet) - 12-14 - cm
• Vertebral level of the pharyngoesophageal junction - C5-C6 - vertebral level
• Distance from incisor teeth to the upper oesophageal sphincter (endoscopic landmark, adult) - 15-18 - cm
• Peak hypopharyngeal contractile pressure during swallow (high-resolution manometry; protocol-dependent) - 100-250 - mmHg
• Resting upper oesophageal sphincter pressure (pharyngoesophageal junction) - 30-80 - mmHg

1. Which of these typical measurements hold for the sense of pharynx this model covers, and on what evidence? provenance

Failure modes and hazards

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

• Luminal obstruction by adenotonsillar hypertrophy, foreign body, oedema, or tumour, producing stertor, dysphagia, or acute airway threat
• Failed swallow with penetration or aspiration, from stroke, neuromuscular disease, or post-treatment xerostomia and stricture
• Velopharyngeal insufficiency with hypernasal speech and nasal regurgitation
• Collapsible pharyngeal airway causing obstructive sleep apnoea and, in children, failure to thrive or pulmonary hypertension when chronic
• Infection ranging from uncomplicated pharyngitis to peritonsillar, parapharyngeal, or retropharyngeal abscess, and to Lemierre syndrome after fusobacterial pharyngitis
• Malignancy: nasopharyngeal carcinoma, HPV-associated and HPV-independent oropharyngeal squamous carcinoma, and hypopharyngeal squamous carcinoma (often late, with high aspiration and nutritional risk)
• Pharyngoesophageal (Zenker) diverticulum at Killian's triangle with regurgitation and aspiration
• Iatrogenic perforation, bleeding, or velopharyngeal damage after instrumentation, adenotonsillectomy, or intubation; pharyngocutaneous fistula after laryngectomy

1. Which of these failure modes and hazards hold for the sense of pharynx this model covers, and on what evidence? provenance

Regional variation

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

• Anatomists (TA) prefer laryngopharynx; head-and-neck oncology, especially AJCC/UICC usage in North America and trial groups, uses hypopharynx for the same inferior third
• Nasopharyngeal carcinoma is endemic in southern China, much of Southeast Asia, the Maghreb, and Arctic Inuit/Aleut populations, and rare as an index cancer in most of Europe and North America
• Historic Ho staging from Hong Kong still colours NPC discussion in East Asia even where AJCC/UICC TNM is now official
• Lay 'throat' in English and many other languages collapses pharynx with larynx; clinical records must not treat those as synonyms
• Oropharyngeal cancer case mix shifted toward HPV-positive disease in several high-income countries, which changes typical age, risk factors, and staging relative to regions where tobacco and alcohol still dominate

1. Which of these regional variation hold for the sense of pharynx this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

• Larynx - The larynx is the cartilaginous voice box around the vocal folds; the hypopharynx is the food passage around it. Piriform-sinus tumours are hypopharyngeal; glottic/supraglottic mucosal tumours are laryngeal. The dividing line is the laryngeal inlet (aryepiglottic folds, epiglottic margin).
• Oral cavity - AJCC places the oral cavity anterior to the junction of hard and soft palate, the anterior tonsillar pillars, and the circumvallate papillae; the palatine tonsil and tongue base are oropharynx, not oral cavity.
• Nasal cavity - Separated from the nasopharynx at the choanae; nasal cavity has turbinates and a nasal septum, nasopharynx has torus tubarius and adenoid bed.
• Oesophagus - Begins at the pharyngoesophageal junction (inferior cricoid, typically C5-C6), where the inferior constrictor/cricopharyngeus forms the upper sphincter; squamous lining continues, but the muscular tube is no longer pharyngeal constrictor.
• Retropharyngeal space - A fascial compartment behind the buccopharyngeal fascia, not the pharyngeal lumen; abscess or nodes there are deep-neck disease, diagnosed on cross-sectional imaging rather than by looking into the tube.
• Soft palate (velum) - A mobile flap that forms the anterior wall of the velopharynx and the roof of the oropharynx; it is a neighbouring organ, not a pharyngeal subdivision, though its failure produces velopharyngeal incompetence.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of pharynx this model covers, and on what evidence? provenance