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The Esophagus (25 cm Musculoglandular Conduit), Course, Course - Coggle…
The Esophagus (25 cm Musculoglandular Conduit)
Anatomical Divisions & Boundaries (Cervical, Thoracic & Abdominal Segments)
General Features
Primary Function
Propulsive organ transporting the food bolus via organized peristaltic waves
Definition
Flexible musculoglandular tube extending from the pharynx down to the cardia of the stomach
Total Length
~25 cm in adults
Topographical Course
Descends in the neck and thorax posterior to the trachea
Segmental Divisions & Boundaries
2. Thoracic Esophagus (18 cm)
Vertebral Extent: Extends from T2 down to T9
Traversing the posterior mediastinum alongside the thoracic aorta and trachea
3. Abdominal Esophagus (2 cm)
Course & Termination
Passes through the diaphragm via the esophageal hiatus (~T10 level) to open into the stomach at the cardia
1. Cervical Esophagus (5 cm)
Superior Boundary: Lower border of the cricoid cartilage (corresponds to vertebral level C6)
Descends behind the cervical trachea
Esophageal Pathologies (GERD, Malignancy & Infection)
Gastroesophageal Reflux Disease (GERD)
Pathophysiology
Incompetence of the lower esophageal sphincter (LES) causing gastric acid backflow
Clinical Features
Pyrosis (retrosternal heartburn)
Mucosal inflammation progressing to peptic ulceration (reflux esophagitis)
Opportunistic Infections (Esophageal Candidiasis)
Etiology
Fungal infection (Candida albicans)
Clinical Context
Almost exclusively occurs in immunocompromised individuals, e.g.,
HIV/AIDS
Patients on immunosuppressive therapy or chemotherapy
Esophageal Cancers (Squamous Cell Carcinoma)
Clinical Presentation : Dysphagia
Characteristically begins as intermittent dysphagia to solids, progressing to permanent/complete dysphagia (solids and liquids)
Diagnostic Gold Standard
Flexible upper endoscopy (fibroscopic esophagoscopy) with tissue biopsy
Course
Course