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Published in Terence R. Anthoney, Neuroanatomy and the Neurologic Exam, 2017
We have yet to consider the anterior-posterior extent of the fusiform gyrus and of the lateral O-T gyrus. Both gyri clearly extend anteriorly far into the temporal lobe, though most authors do not specify exactly how far. The only author noted to be inconsistent with this statement is Romero-Sierra (1986), who was also noted earlier to be the only author to describe the fusiform gyrus as lying between the calcarine fissure and the collateral sulcus. Since most authors describe the calcarine fissure as lying wholly within the occipital lobe (e.g., B&K, p. 214 [Fig. 13–2]; C&S, p. 31–32,. W&G, p. 210; Heim, p. 73; Nolt, p. 17, 19 [Fig 2–10]), Romero-Sierra’s description of the fusiform gyrus’s boundaries suggests that he considers that gyrus also to lie solely within the occipital lobe.
Visual cortex
Published in Fiona Rowe, Visual Fields via the Visual Pathway, 2016
The nerve fibres of the optic radiations terminate in layer 4 (lamina granularis) of the primary visual striate cortex (V1, Brodmann area 17) which is located on the medial aspect of the occipital lobe, superior and inferior to the calcarine fissure. Layer 4 of the visual striate cortex comprises four further layers which receive separate input from magno-cellular and parvocellular pathways. The calcarine fissure has three zones; the posterior macular area (which accounts for 50%–60% of the calcarine cortex), the binocular peripheral area and the anterior monocular peripheral area (which accounts for approximately 10% of the calcarine cortex). The visual cortex is very thin, being only 1.5-mm thick on the floor of the calcarine fissure.
The viva: operative surgery and surgical anatomy
Published in Vivian A. Elwell, Ramez Kirollos, Syed Al-Haddad, Neurosurgery, 2014
Vivian A. Elwell, Ramez Kirollos, Syed Al-Haddad
The calcarine fissure is an anatomical landmark located at the caudal end of the medial surface of the brain. The calcarine sulcus begins near the occipital pole in two converging rami and runs forward to a point a little below the splenium of the corpus callosum, where it is joined at an acute angle by the medial part of the parieto-occipital sulcus. The anterior part of this fissure gives rise to the prominence of the calcar avis in the posterior cornu of the lateral ventricle.
Brain structural network topological alterations of the left prefrontal and limbic cortex in psychogenic erectile dysfunction
Published in International Journal of Neuroscience, 2018
Jianhuai Chen, Yun Chen, Qingqiang Gao, Guotao Chen, Yutian Dai, Zhijian Yao, Qing Lu
By means of correlation analysis, we found that Ci in the left hippocampus was positively correlated with the duration of pED. The result indicated that the high level of local cliquishness or the high level of local efficiency of information transfer of the sub-network composed of nodes that connected with the left hippocampus might be more severe with longer duration of pED. Moreover, at the uncorrected threshold, the bi values of the right anterior cingulate gyrus and the left calcarine fissure were negatively correlated with the sum scores of HAMD-17. As we know, neuroimaging studies had showed that the limbic regions such as hippocampus and anterior cingulate gyrus involved in emotion and cognition regulation, as well as man sexual arousal [13,49–51]. Thus, we speculated that the lesion on the local information interaction in the left hippocampus and the pivotal role of the right anterior cingulate gyrus and the left calcarine fissure in the communication of the whole brain might indicate the development, maintain and the severity of pED, respectively.
A review of magnetoencephalography use in pediatric epilepsy: an update on best practice
Published in Expert Review of Neurotherapeutics, 2021
Hiroshi Otsubo, Hiroshi Ogawa, Elizabeth Pang, Simeon M Wong, George M Ibrahim, Elysa Widjaja
VEFs are easily recorded in adults [124] and children [125], with the most challenging aspect being that the patient is required to be awake and alert. The patient must also fixate their eyes on a specified point to minimize eye movements and blinking. VEF yields consistent results with the P100m localization within the calcarine fissure. VEF localization may be indicated to explore the spatial relation between epileptiform activity [126] or occipital lobe tumors [127] to primary visual cortices.