Which of the alphabets denotes insula in the cross-section of the brain?
Ans: C. C
(Ref: Gray’s 41Ie p383, 40/e p346)
- Insula is located deep in lateral sulcus of cerebral cortex.
- Lies deep in the floor of the lateral fissure, almost surrounded by a circular sulcus, and overlapped by adjacent cortical areas, the opercula.
- The frontal operculum is between the anterior and ascending rami of the lateral fissure, forming a triangular division of the inferior frontal gyrus.
- The frontoparietal operculum, between ascending and posterior rami of the lateral fissure, consists of the posterior part of the inferior frontal gyrus, the lower ends of the precentral and postcentral gyri, and the lower end of the anterior part of the inferior parietal lobule.
- The temporal operculum, below the posterior ramus of the lateral fissure, is formed by superior temporal and transverse temporal gyri.
- Anteriorly, the inferior region of the insula adjoins the orbital part of the inferior frontal gyrus.