Circumvallation

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Circumvallation

 

a line of entrenchments or ramparts around a besieged fortress. Circumvallation was used until the 19th century by the besieging forces to repulse an attack from enemy forces coming to help the besieged.

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Fiberoptic laryngoscopy showed that the fistula site had been placed in the midline, posterior to the circumvallate papillae.
The sulcus terminalis, which extends along the line of circumvallate papillae, demarcates the junction of the anterior and posterior portions of the tongue.