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The basal ganglia (BG) or basal nuclei are a group of subcortical nuclei found in the brains of vertebrates. In humans and other primates , differences exist, primarily in the division of the globus pallidus into external and internal regions, and in the division of the striatum .
The basal ganglia is a collective group of structures in the brain. These include the striatum, (composed of the putamen and caudate nucleus), globus pallidus, substantia nigra, and the subthalamic nucleus. Along with other structures, the basal ganglia are part of a neural circuit that is integral to voluntary motor function. [1]
Hemiballismus or hemiballism is a basal ganglia syndrome resulting from damage to the subthalamic nucleus in the basal ganglia. [1] It is a rare hyperkinetic movement disorder, [2] that is characterized by pronounced involuntary limb movements [1] [3] on one side of the body [4] and can cause significant disability. [5]
[26] [57] HD also causes an abnormal increase in astrocytes and activation of the brain's immune cells, microglia. [58] The basal ganglia play a key role in movement and behavior control. Their functions are not fully understood, but theories propose that they are part of the cognitive executive system [28] and the motor circuit. [59]
Neurodegeneration with brain iron accumulation is a heterogenous group of inherited neurodegenerative diseases, still under research, in which iron accumulates in the basal ganglia, either resulting in progressive dystonia, parkinsonism, spasticity, optic atrophy, retinal degeneration, neuropsychiatric, or diverse neurologic abnormalities. [1]
Encephalitis with meningitis is known as meningoencephalitis, while encephalitis with involvement of the spinal cord is known as encephalomyelitis. [2] The word is from Ancient Greek ἐγκέφαλος, enképhalos 'brain', [37] composed of ἐν, en, 'in' and κεφαλή, kephalé, 'head', and the medical suffix -itis 'inflammation'. [38]
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Some specific other rare patterns have been described: the superior frontal sulcus (SFS) watershed pattern, a watershed pattern involving the entire hemisphere (holohemispheric), and a central pattern with vasogenic oedema in the deep white matter, basal ganglia, thalami, brainstem and pons.