| limen | Entrance; the external opening of a canal or space, such as limen insulae. Synonym: threshold. Origin: L. (05 Mar 2000) |
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| limen insulae | The band of transition between the anterior portion of the gray matter of the insula and the anterior perforated substance; it is formed by a narrow strip of olfactory cortex along the lateral side of the lateral olfactory stria. Synonym: threshold of island of Reil. (05 Mar 2000) |
| limen nasi | A ridge marking the boundary between the nasal cavity proper and the vestibule. Synonym: threshold of nose. (05 Mar 2000) |