The insular cortex is located immediately deep to the Sylvian fissure. The Sylvian fissure can be divided into a superficial and deep part. The superficial part comprises the sylvian fissure 'stem' and three main rami anterior horizontal, anterior ascending, and posterior rami.
The deep part comprises two compartments called the sphenoidal and the operculoinsular compartments of the sylvian fissure 3. From its origin lateral to the anterior perforated substance , the fissure courses medially to form the stem of the lateral fissure, also known as the Sylvian cistern , into which passes the middle cerebral artery and its major branches. Laterally, it has two branches or 'rami' which extend into, and divide, the frontal operculum.
The anterior ramus also known as horizontal ramus separates the pars orbitalis from the pars triangularis , and the ascending ramus also known as vertical ramus or anterior ascending ramus separates the pars triangularis from the pars opercularis.
The lateral sulcus terminates posteriorly in a bifurcation, with the posterior ascending ramus lying within the supramarginal gyrus of the inferior parietal lobule. Superiorly the lateral sulcus may be termed the circular sulcus , surrounding the insular cortex medially. The operculoinsular compartment of the sylvian fissure can be further subdived into an opercular and insular compartments.
The more medial insular compartment is located on the lateral surface of the insula and contains the M2 segment of middle cerebral artery MCA and insular veins. The opercular compartment is located between the opercula laterally. It is the location of the M3 segment of the MCA once the M2 segment completes its downward turn at the superior and inferior limiting sulci of the insula to follow the inner surface of the frontal, parietal, and temporal opercula towards the cortex 3.
Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Updating… Please wait. Unable to process the form. The limbic system is sometimes given its own area and called the limbic lobe. Examination of the lateral surface of the brain will reveal the lateral sulcus the Sylvian fissure. This groove separates the temporal lobe from the parietal lobe. A less conspicuous groove, the central sulcus the Rolandic Sulcus , may be found by looking for two parallel gyri extending from the superior margin of the cerebrum down to the lateral fissure.
Two of the most prominent and most regularly found are the ascending also called vertical ramus and the horizontal ramus of the lateral fissure, which subdivide the inferior frontal gyrus.
The lateral sulcus also contains the transverse temporal gyri, which is part of the primary localized auditory cortex. It was named the sylvian fissure after Franciscus Sylvius , professor of medicine at Leiden University. Category : Cerebrum. Read what you need to know about our industry portal bionity. My watch list my. My watch list My saved searches My saved topics My newsletter Register free of charge.
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