The mylohyoid may be imaged by CT or MRI. The mylohyoid separates the submandibular space below from the sublingual space above. Around the posterior border of mylohoid, these spaces communicate. Infections, especially odontogenic infections can spread from one space to the other via this communication, or alternatively penetrate the mylohyoid which is a poor barrier to the spread of infection. Because the attachment of mylohyoid (the mylohoid line) becomes more superior towards the posterior of the mandible, posterior infected teeth are more likely to drain into the mandibular space, and infected anterior teeth are more likely to drain into the sublingual space, since the apices of the teeth are more likely to be below and above the mylohoid line respectively (see diagram).
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