Which anatomical space is involved when pus accumulates between the tonsillar capsule and the superior pharyngeal constrictor muscle?

Explanation

## Anatomy of Peritonsillar Abscess **Key Point:** A peritonsillar abscess (PTA) is a collection of pus in the **peritonsillar space**, which is the potential space between the tonsillar capsule (lined by the superior pharyngeal constrictor muscle) and the surrounding pharyngeal wall. ### Anatomical Spaces of the Pharynx and Neck | Space | Boundaries | Contents | Clinical Significance | |-------|-----------|----------|----------------------| | **Peritonsillar space** | Between tonsillar capsule and superior pharyngeal constrictor | Loose areolar tissue; site of PTA formation | Most common site of post-tonsillitis suppuration | | Retropharyngeal space | Between pharyngeal constrictor and alar fascia (layer 2 of deep cervical fascia) | Loose areolar tissue, lymph nodes | Risk of mediastinitis if infection descends | | Parapharyngeal (lateral pharyngeal) space | Lateral to superior pharyngeal constrictor; bounded by mandible laterally | Loose areolar tissue, vessels, nerves | Can spread from PTA; risk of airway compromise | | Submandibular space | Below mylohyoid; bounded by mandible | Salivary glands, lymph nodes | Associated with Ludwig's angina if bilateral | **High-Yield:** The peritonsillar space is the **primary site of abscess formation** after acute tonsillitis because: 1. It contains loose areolar tissue with poor vascularization 2. It is bounded by the tonsillar capsule medially and pharyngeal constrictor laterally 3. Infection can rupture through the capsule into this space **Clinical Pearl:** A peritonsillar abscess typically presents with **"hot potato" voice**, dysphagia, trismus, and uvular deviation away from the affected side. It is the most common deep neck space infection in children and young adults. **Mnemonic:** **PTA = Peritonsillar space Trapped Abscess** (pus between capsule and constrictor)