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Superior longitudinal fasciculus

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Superior longitudinal fasciculus

"Superior longitudinal fasciculus" by?The Hive - UBC Medicine

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Lateral surface of left?cerebral hemisphere. Some of major?association tracts?are depicted. Superior longitudinal fasciculus is at center, in red.

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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])

(這里描述的應(yīng)該是Superior occipitofrontal fasciculus。見下圖)

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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).

該詞條中的SLF I, SLF II, and SLF III都是在說pareital lobe如何與frontal lobe連接，與該詞條中的“SLF?connects the?frontal,?occipital,?parietal, and?temporal lobes”相矛盾，也與其他資料圖中的內(nèi)容相矛盾，不過也很好，如果敢于大膽猜測的話，我認(rèn)為正好補(bǔ)充了netter圖中沒有畫出的內(nèi)容。

總之，研究時需要各個資料來源對比來看，然后大膽假設(shè)，小心求證吧。不過，最為關(guān)鍵的SLF是不是reciprocal connection，好像詞條也沒把這個連接屬性當(dāng)回事，只是隨便逗露一下SLF?II是reciprocal，顯然科學(xué)家們沒有搞清楚reciprocal connection對記憶的重要性。