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The lentiform nucleus (or lentiform complex, lenticular nucleus, or lenticular complex) are the putamen (laterally) and the globus pallidus (medially), collectively. Due to their proximity, these two structures were formerly considered one, however, the two are separated by a thin layer of white matter—the external medullary lamina—and are functionally and connectionally distinct.
The putamen (/ p j u ˈ t eɪ m ə n /; from Latin, meaning "nutshell") is a subcortical nucleus with a rounded structure, in the basal ganglia nuclear group. It is located at the base of the forebrain and above the midbrain. The putamen and caudate nucleus together form the dorsal striatum.
[2] [3] [4] The striatum is made up of the caudate nucleus and the lentiform nucleus. [7] [8] However, some authors believe it is made up of caudate nucleus, putamen, and ventral striatum. [9] The lentiform nucleus is made up of the larger putamen, and the smaller globus pallidus. [10] Strictly speaking the globus pallidus is part of the striatum.
Instead, the putamen was associated with the pallidum in what was called the nucleus lenticularis or nucleus lentiformis. A thorough reconsideration by Cécile and Oskar Vogt (1941) simplified the description of the basal ganglia by proposing the term striatum to describe the group of structures consisting of the caudate nucleus, the putamen ...
The anterior limb of the internal capsule (or crus anterius) is situated in front of the genu, between the head of the caudate nucleus and the lentiform nucleus. [4] It contains: Thalamocortical fibers passing from the lateral thalamic nuclei to the frontal lobe [4] Corticothalamic fibres passing from the frontal lobe to the lateral thalamic ...
These fibers run between the most lateral (toward the side of the head) segment of the lentiform nucleus (more specifically the putamen) and the claustrum. The white matter of the external capsule contains fibers known as corticocortical association fibers. These fibers are responsible for connecting the cerebral cortex to another cortical area ...
The efferent bundle is constituted first of the ansa and lenticular fasciculus, then crosses the internal capsule within and in parallel to the Edinger's comb system then arrives at the laterosuperior corner of the subthalamic nucleus and constitutes the field H 2 of Forel, then H, and suddenly changes its direction to form field H 1 that goes to the inferior part of the thalamus.
The most commonly affected region of the brain is the lenticular nucleus and in particular the internal globus pallidus. [21] Calcifications in the caudate, dentate nuclei, putamen and thalami are also common. Occasionally calcifications begin or predominate in regions outside the basal ganglia. [citation needed]