This high-yield revision note on Odontogenic Infections: Fascial Spaces & How They Spread covers everything examiners typically test under Oral Surgery — structured as quick-reference tables, clinical correlations, mnemonics and previous-year-style high-yield points. It's built for last-mile revision before NEET MDS, INI-CET MDS and INBDE, so you can scan it in minutes instead of re-reading a whole textbook chapter.
| Space | Usual Source Tooth | Determining Boundary | Clinical Sign |
|---|---|---|---|
| Sublingual space | Mandibular premolars/1st molar (apex ABOVE mylohyoid line) | Superior to mylohyoid muscle | Elevation of tongue, minimal extraoral swelling initially |
| Submandibular space | Mandibular molars, especially 2nd/3rd molar (apex BELOW mylohyoid line) | Inferior to mylohyoid muscle | Extraoral swelling below the mandibular border |
| Submental space | Mandibular anterior teeth | Below mylohyoid, between the anterior bellies of digastric | Firm midline submental swelling |
| Ludwig's angina | Mandibular molars - bilateral spread to submandibular + sublingual + submental spaces | Bilateral, rapidly spreading cellulitis (NOT a discrete abscess) | "Bull neck", tongue elevation, potential AIRWAY OBSTRUCTION - true emergency, secure airway first |
| Masticator space (masseteric, pterygomandibular, temporal) | Mandibular molars, especially 3rd molar pericoronitis | Muscles of mastication | Trismus is a prominent early sign, sometimes with minimal visible facial swelling |
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