A long flat bundle of nerves called the vertical occipital fasciculus
, or VOF, the structure appeared in textbooks on the brain for about 30 years around the end of the 19th century, then mysteriously dropped out of sight completely.
gracilis and fasciculus
cuneatus, located in the posterior aspect of the cord, carry sensory information regarding light touch and vibration.
Imaging to assess brain microstructure identified increased fractional anisotropy in the anterior right arcuate fasciculus
of patients with chronic fatigue syndrome, which was not present in age- and sex-matched control subjects.
Internuclear ophthalmoplegia, resulting from an inflammatory demyelinating lesion in the medial longitudinal fasciculus
, is characterised by impaired horizontal eye movement with a weak adduction deficit of the affected eye and an abduction nystagmus of the contralateral eye; this results in horizontal diplopia.
34) demonstrated the cause of pure alexia neuroradiologically in a patient with surgical damage that cut the interrelation of the "visual word area" located on the left occipitotemporal sulcus and the occipital cortex; the connection between the two is the inferior longitudinal fasciculus
, and injury to this pathway leads to a typical disconnection syndrome.
The recognition of dissociated nystagmus was important in the diagnosis of these patients, since qualitative nystagmus dissociation is related to lesions of the medial longitudinal fasciculus
and is common in degenerative central nervous system disorders.
An electrophysical examination showed bilateral moderate slowing in the macular fibers during a visual evoked potential (VEP) test and a total conduction block in the fasciculus
gracilis on the somatosensorial evoked potential (SEP) test.
Expressive language cortex in the dominant inferior, posterior frontal lobe and receptive cortex in the dominant superior posterior temporal lobe, together with the white matter pathway connecting these two regions, the arcuate fasciculus
, is commonly cited as the neural substrate of language.
They found that the arcuate fasciculus
, a collection of nerve fibres connecting auditory regions at the temporal lobe with the motor area located at the frontal lobe in the left hemisphere of the brain, allows the 'sound' of a word to be connected to the regions responsible for its articulation.
causes of nuclear and fascicular lesions are similar, except that demyelination may affect the fasciculus
An additional pathway important for labeling pitch has recently been uncovered in the arcuate fasciculus
(AF) , which is a fiber tract connecting frontal and temporal areas (Figure).
Among the fiber tracts that are evident in the normal fetal brain are the corpus callosum; the fimbria, a band of white matter along the edge of the hippocampus; the fornix, a bundle of fibers that connects the hippocampus on either side of the brain and then projects down and back toward the thalamus; and the fasciculus
retroflexus, which consists of major output fibers of the forebrain.