Question
Which structure is just lateral to anterior perforated substance ?
| A. |
Uncha
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| B. |
Limen insulae
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| C. |
3rd Ventricle
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| D. |
Optic chiasma
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Show Answer
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Correct Answer � B
Explanation
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Ans.B. Limen insulae
Located within the basal forebrain, the anterior perforated substance is a quadrilateral area of grey matter positioned posterior to the gyrus rectus and olfactory trigone and anterolateral to the optic tract. It is bounded medially by the optic chiasma and laterally by the lateral olfactory striae.
Limen insulae is the lateral mist limit of the anterior perforated substance and the starting point of the insular cortex.
It represents the level at which the middle cerebral artery typically bifurcates/trifurcates.
It is the starting point of the insular cortex. The limen insulae translates as the threshold to the insula and is the point at which the insular cortex is continuous with cortex over the amygdala and superior temporal gyrus.
