What does the uncinate fasciculus do?
The uncinate fasciculus (UF) is the largest white matter association tract connecting the prefrontal cortex with the anteromedial temporal lobe [1]. Functionally, the UF is considered key in the prefrontal inhibition of the mesial temporal lobe structures [2-5].
What is the uncinate fasciculus what part does it play in memory?
We propose that an overarching role of the uncinate fasciculus is to allow temporal lobe-based mnemonic associations (e.g. an individual’s name + face + voice) to modify behaviour through interactions with the lateral orbitofrontal cortex, which provides valence-based biasing of decisions.
What is the role of the uncinate fasciculus surgical removal and proper name retrieval?
In conclusion, the resection of the uncinate fasciculus, in its frontal or temporal part, has long-lasting consequences for famous face naming. We suggest that this fibre tract is part of a circuitry involved in the retrieval of word form for proper names. Retrieval of conceptual knowledge was intact.
Where is the uncinate fasciculus located?
temporal lobe
The uncinate fasciculus is a white matter tract in the human brain that connects parts of the limbic system such as the hippocampus and amygdala in the temporal lobe with frontal ones such as the orbitofrontal cortex.
What are Uncinate fits?
A form of temporal lobe epilepsy in which hallucinations of taste and smell and inappropriate chewing movements are prominent features. From: uncinate fits in Concise Medical Dictionary ยป
What is the uncinate process of the nose?
The uncinate process is a wing or boomerang shaped piece of bone. It forms the first layer or lamella of the middle meatus. It attaches anteriorly to the posterior edge of the lacrimal bone, and inferiorly to the superior edge of the inferior turbinate.
What are uncinate fits?
What is the uncinate?
Medical Definition of uncinate process : a hooklike body part: as. a : an irregular downwardly and backwardly directed process of each lateral mass of the ethmoid bone that articulates with the inferior nasal conchae.
What are association fibers?
Association fibers: These are the fibers connecting different cortical areas of the same side to one another. Short association fibers connect adjacent gyri. Long association fibers connect distant part of the cerebral cortex in the same side (Fig. 1.12).
What are white matter tracts in the brain?
White matter refers to areas of the central nervous system (CNS) that are mainly made up of myelinated axons, also called tracts. However, the tissue of the freshly cut brain appears pinkish-white to the naked eye because myelin is composed largely of lipid tissue veined with capillaries.
What causes Uncinate fits?
Uncinate epilepsy is a form of psychomotor epilepsy that is initiated by a dreamy state and by hallucinations of smell and taste. Uncinate epilepsy is usually caused by a medial temporal lesion. About 50 million people have epilepsy, with 80% of that population located in developing countries.
What is olfactory aura?
Olfactory auras, consisting of a sudden unexplained sensation of smell, are rare, particularly in compari- son to other auras. They are usually described as unpleasant. Their exact prevalence, etiology, and an- atomic origin are unclear because few studies have focused on olfactory auras alone.
