Dorsal component of the superior longitudinal fasciculus revisited: novel insights from a focused fiber dissection study.

Abstract:

OBJECTIVE:The aim of this study was to investigate the anatomical consistency, morphology, axonal connectivity, and correlative topography of the dorsal component of the superior longitudinal fasciculus (SLF-I) since the current literature is limited and ambiguous. METHODS:Fifteen normal, adult, formalin-fixed cerebral hemispheres were studied through a medial to lateral fiber microdissection technique. In 5 specimens, the authors performed stepwise focused dissections of the lateral cerebral aspect to delineate the correlative anatomy between the SLF-I and the other two SLF subcomponents, namely the SLF-II and SLF-III. RESULTS:The SLF-I was readily identified as a distinct fiber tract running within the cingulate or paracingulate gyrus and connecting the anterior cingulate cortex, the medial aspect of the superior frontal gyrus, the pre-supplementary motor area (pre-SMA), the SMA proper, the paracentral lobule, and the precuneus. With regard to the morphology of the SLF-I, two discrete segments were consistently recorded: an anterior and a posterior segment. A clear cleavage plane could be developed between the SLF-I and the cingulum, thus proving their structural integrity. Interestingly, no anatomical connection was revealed between the SLF-I and the SLF-II/SLF-III complex. CONCLUSIONS:Study results provide novel and robust anatomical evidence on the topography, morphology, and subcortical architecture of the SLF-I. This fiber tract was consistently recorded as a distinct anatomical entity of the medial cerebral aspect, participating in the axonal connectivity of high-order paralimbic areas.

journal_name

J Neurosurg

journal_title

Journal of neurosurgery

authors

Komaitis S,Skandalakis GP,Kalyvas AV,Drosos E,Lani E,Emelifeonwu J,Liakos F,Piagkou M,Kalamatianos T,Stranjalis G,Koutsarnakis C

doi

10.3171/2018.11.JNS182908

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

1265-1278

issue

4

eissn

0022-3085

issn

1933-0693

pii

2018.11.JNS182908

journal_volume

132

pub_type

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