from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Biology A hook-shaped part or process.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hook or claw.
- n. Hence, any body part which is long, thin, and curved.
- n. Specifically, the hooked end of the parahippocampal gyrus of the temporal lobe; also called the uncinate gyrus or uncus gyri parahippocampalis.
from the GNU version of the Collaborative International Dictionary of English
- n. A hook or claw.
from The Century Dictionary and Cyclopedia
- n. The hook-like anterior extremity of the uncinate convolution of the brain.
- n. In entomology, the beak-like mesial prolongation of the eighth abdominal segment of lepidopteróus insects. It forms no proper part of the organs ancillary to generation.
- n. The head, hook, or comb of the malleolus or lateral tooth of the mastax of a wheel-animalcule.
- n. In botany, a hook.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (biology) any hook-shaped process or part
Sense of smell is projected in uncus [ "uncus" means hook] and hippocampus which are also parts of temporal lobe on medial aspect.
The parts sound comically ominous--the amygdala, the hippocampus, the uncus.
At I 313-16, Lucretius, discussing the invisible wearing away of substances, says 'stilicidi casus _lapidem_ cauat, uncus aratri/_ferreus_ occulte decrescit uomer in aruis,/strataque iam uolgi pedibus detrita uiarum/saxea conspicimus'.
Anteriorly it is continued into the notch of the uncus, where it forms a sharp bend and is then prolonged as a delicate band, the band of Giacomini, over the uncus, on the lateral surface of which it is lost.
The rhinencephalon comprises the olfactory lobe, the uncus, the subcallosal and supracallosal gyri, the fascia dentata hippocampi, the septum pellucidum, the fornix, and the hippocampus.
The Hippocampal Fissure (fissura hippocampi; dentate fissure) begins immediately behind the splenium of the corpus callosum, and runs forward between the hippocampal and dentate gyri to end in the uncus.
Here it lies along the concavity of the hippocampus, on the surface of which some of its fibers are spread out to form the alveus, while the remainder are continued as a narrow white band, the fimbria hippocampi, which is prolonged into the uncus of the hippocampal gyrus.
It is merely a localized thickening of the gray cortex, continuous with that of the uncus; in front it is continuous with the putamen, behind with the stria terminalis and the tail of the caudate nucleus.
The anterior extremity of the hippocampal gyrus is recurved in the form of a hook (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.