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The medial temporal lobe structures are critical for long-term memory, and include the hippocampal formation, perirhinal cortex, parahippocampal, and entorhinal neocortical regions. [ 4 ] : 196 [ 5 ] The hippocampus is critical for memory formation, and the surrounding medial temporal cortex is currently theorized to be critical for memory storage.
The pathophysiology of anterograde amnesic syndromes varies with the extent of damage and the regions of the brain that were damaged. The most well-described regions indicated in this disorder are the medial temporal lobe (MTL), basal forebrain, and fornix. Beyond the details described below, the precise process of how we remember – on a ...
Studies have shown that activity in the medial temporal lobe (MTL) structures: [5] perirhinal cortex, parahippocampal cortex and the hippocampus are vital to the recollection of personal-event memories [6] along with other memories. the medial temporal lobe structures, parietal and frontal lobes of the brain, all contribute to forming and retrieving memories.
The entorhinal cortex (EC) is an area of the brain's allocortex, located in the medial temporal lobe, whose functions include being a widespread network hub for memory, navigation, and the perception of time. [1] The EC is the main interface between the hippocampus and neocortex.
Consolidation of STM into LTM at the molecular level presumably involves two processes: synaptic consolidation and system consolidation. The former involves a protein synthesis process in the medial temporal lobe (MTL), whereas the latter transforms the MTL-dependent memory into an MTL-independent memory over months to years (Ledoux 2007).
The perirhinal cortex is a cortical region in the medial temporal lobe that is made up of Brodmann areas 35 and 36.It receives highly processed sensory information from all sensory regions, and is generally accepted to be an important region for memory.
After Molaison underwent a bilateral medial temporal lobe resection to alleviate epileptic symptoms the patient began to suffer from memory impairments. Molaison lost the ability to encode and consolidate newly learned information leading researchers to conclude the medial temporal lobe (MTL) was an important structure involved in this process. [6]
The dorsal medial nucleus therefore receives indirect input from both the amygdala and the nucleus basalis. Lesions to the dorsal medial nucleus cause amnesic syndromes, but they need to interrupt both the mammillothalamic tract and the amygdalofugal pathway in order to do so. Thus, both pathways play a role in memory. [16]