For the component of lepidopteran genitalia, see uncus (genitals).

Medial surface of left cerebral hemisphere. Uncus is shown in orange.

Human brain inferior-medial view (Uncus is #5)
NeuroNames hier-21
TA A14.1.09.235
FMA 74884

Anatomical terms of neuroanatomy

The uncus is an anterior extremity of the Parahippocampal gyrus. It is separated from the apex of the temporal lobe by a slight fissure called the incisura temporalis.

Although superficially continuous with the hippocampal gyrus, the uncus forms morphologically a part of the rhinencephalon.

The term comes from the Latin word uncus which means hook and it was coined by Felix Vicq d’Azyr (1748–1794).[1]

Clinical significance

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.

The landmark that helps you find the amygdala on a coronal section of the brain.

Additional images


This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

  1. JC Tamraz, YG Comair. Atlas of Regional Anatomy of the Brain Using MRI (2006), p 8.
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