wiki笔记--Superior longitudinal fasciculus--2021/11/12
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Superior longitudinal fasciculus
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Superior longitudinal fasciculus
"Superior longitudinal fasciculus" by The Hive - UBC Medicine
Lateral surface of left cerebral hemisphere. Some of major association tracts are depicted. Superior longitudinal fasciculus is at center, in red.
Diagram showing principal systems of association fibers in the cerebrum. (Sup. longitudinal fasc. labeled at center top.)
Details
Identifiers
Latin
fasciculus longitudinalis superior cerebri
NeuroNames
2080
TA98
A14.1.09.557
TA2
5599
FMA
77631
Anatomical terms of neuroanatomy
[edit on Wikidata]
The superior longitudinal fasciculus (SLF) is an association fiber tract in the brain that is composed of three separate components.[1][2] It is present in both hemispheres and can be found lateral to the centrum semiovale and connects the frontal, occipital, parietal, and temporal lobes.[2] These bundles of axon tracts pass from the frontal lobe through the operculum to the posterior end of the lateral sulcus where they either radiate to and synapse on neurons in the occipital lobe or turn downward and forward around the putamen and then radiate to and synapse on neurons in anterior portions of the temporal lobe.[citation needed]
The SLF is composed of three distinct components SLF I, SLF II, and SLF III.[2][3]
Contents
· 1SLF I
· 2SLF II
· 3SLF III
· 4References
· 5External links
SLF I[edit]
SLF I is the dorsal component and originates in the superior and medial parietal cortex, passes around the cingulate sulcus and in the superior parietal and frontal white matter, and terminates in the dorsal and medial cortex of the frontal lobe (Brodmann 6, 8, and 9) and in the supplementary motor cortex (M II).[4][5])
(这里描述的应该是Superior occipitofrontal fasciculus。见下图)
SLF I connects to the superior parietal cortex which encodes locations of body parts in a body-centric coordinate system and with M II and dorsal premotor cortex.[6] This suggests the SLF I is involved with regulating motor behavior, especially conditional associative tasks which select among competing motor tasks based on conditional rules.
SLF II[edit]
SLF II is the major component of SLF and originates in the caudal-inferior parietal cortex and terminates in the dorsolateral prefrontal cortex (Brodmann 6, 8 and 46).
SLF II connects to the caudal inferior parietal cortex which controls spatial attention and visual and oculomotor functions. This suggests the SLF II provides the prefrontal cortex with parietal cortex information regarding perception of visual space. Since these bundles are bi-directional, working memory (Brodmann 46) in the prefrontal cortex may provide the parietal cortex with information to focus spatial attention and regulate selection and retrieval of spatial information.
SLF III[edit]
SLF III is the ventral component and originates in the supramarginal gyrus (rostral portion of the inferior parietal lobe) and terminates in the ventral premotor and prefrontal cortex (Brodmann 6, 44, and 46).
SLF III connects the rostral inferior parietal cortex which receives information from the ventral precentral gyrus. This suggests that the SLF III transfers somatosensory information, such as language articulation, between the ventral premotor cortex, Brodmann 44 (pars opercularis), the supramarginal gyrus (Brodmann 40), and the laterial inferior prefrontal cortex working memory (Brodmann 46).
该词条中的SLF I, SLF II, and SLF III都是在说pareital lobe如何与frontal lobe连接，与该词条中的“SLF connects the frontal, occipital, parietal, and temporal lobes”相矛盾，也与其他资料图中的内容相矛盾，不过也很好，如果敢于大胆猜测的话，我认为正好补充了netter图中没有画出的内容。
总之，研究时需要各个资料来源对比来看，然后大胆假设，小心求证吧。不过，最为关键的SLF是不是reciprocal connection，好像词条也没把这个连接属性当回事，只是随便逗露一下SLF II是reciprocal，显然科学家们没有搞清楚reciprocal connection对记忆的重要性。
