Uncus
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| Brain: Uncus | ||
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| Scheme of rhinencephalon. (Uncus labeled at bottom right.) | ||
| Gray's | subject #189 826 | |
| NeuroNames | hier-21 | |
| Dorlands/Elsevier | u_02/12836346 | |
The anterior extremity of the hippocampal gyrus is recurved in the form of a hook, the uncus, which is separated from the apex of the temporal lobe by a slight fissure, the incisura temporalis.
Although superficially continuous with the hippocampal gyrus, the uncus forms morphologically a part of the rhinencephalon.
The part of the olfactory cortex that is on the temporal lobe covers the area of the uncus, which leads into the two significant clinical aspects of the uncus: uncinate fits and uncal herniations. Seizures, often preceeded by hallucinations of disagreeable odors, often originate in the uncus. In situations of tumor, hemorrhage, or edema, increased volume of the temporal lobe can push the uncus against the brainstem and its corresponding cranial nerves. Brainstem damage is typically contralateral to the herniation.
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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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