| Ten circumoral appendages are present, the 4th being the longest pair, and is retractile into pockets at the ventrolateral sides of head. |
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| The oral commissure prosthesis is used to prevent microstomia when trauma involving the corners of the mouth or circumoral tissue has occurred. |
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| The circumoral nerve ring runs round the mouth and sends fibres to innervate the peristome, mouth and oesophagus. |
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| The chambered nautiluses are characterized by an external, smooth, coiled, chambered shell, circumoral appendages without suckers, a funnel consisting of two flaps or lobes, and simple eyes. |
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| As a result of hypertrophic scarring in the circumoral tissues, constriction of scar tissue can lead to aesthetic and functional problems, causing deformity and affecting facial expression. |
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| The first symptoms are circumoral paresthesia, numbness of the tongue, lightheadedness, hyperacusis and tinnitus. |
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| The first symptoms are usually circumoral paresthesia, numbness of the tongue, lightheadedness, hyperacousis, tinnitus and visual disturbances. |
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