Main Furrow

The main sulcus, or main sulcus (lat. sulcus basi Iaris) is a depression at the bottom of the lateral ventricle of the brain, located along the midline of the brain in the anterior section, when approaching the olfactory bulb. The main sulcus extends from the apex of the cerebellum to the thalamus optic. Its projection corresponds to the posterior part of the corpus callosum and the anterior half of the internal capsule.

The main groove isolates the lateral ventricle from above, and serves as a partition between the internal geniculate body (by forming the vascular junction) and external vision. If you examine the CT X-ray, you will notice that the main sulcus is rounded, emphasizing the curvature of the lateral walls of the forebrain for a couple of centimeters. From the point of view of stereotactic assessment, the main sulcus plays an important role in determining the orientation of various structures associated with the blood supply to the brain.

The Main Groove continues the internal skin analysis. After crossing the cutaneous-lateral fissure at the junction of the ectodermal border and the descending wall of the cerebral cortex, there are several connecting grooves that appear small but are functionally important. One of these small grooves, the main groove, is more than 3 mm wide throughout its entire length. From the middle of their length to the end of the main groove, the left and right symmetrical submedullary nerves extend distally from the central canal. The proximity of these structures facilitates study, since in most cases they are constant indicators of the passage of the external occipital lobe. They are especially useful because, due to the general gross narrowing of the passing medulla, they form a window between the central part of the major ciliary lobe and the posterior portions of the small postcentral lobes. You may also notice that the main groove encloses the lateral branches of the notochord on the opposite side of the central brain. This indicates a continuation of the paraphonidal groove.

The adjacent cobasic grooves can indicate important differentiation of limbic areas and division of the lyssootic complex of the brain. Directions of the cobasic sulcus (in the direction of the posterior skull posteriorly) to the left of the central sulcus the anterotemporal-posterior olfactory sulcus continues. It reaches the posterior edge of the frontal groove. As the superficial corticostriatal tract passes through the lateral wall of the central sulcus, the rectus arteriosus is visible. There is also a minor joint anteriorly coaxial to the hypothalamus, in which the cerebral cavernous sinus rises close to the inferior wall of the brain and the vascular vein splits into the medial superior mesenteric vein and a branch lateral to the sinus. The saphenous vein, fragmented in the minor groove, widens significantly at the posterior edge of the orbitomedial groove. On the contrary, the venous fistula is significantly narrowed in the depths of the Sosnovka groove.

You will also notice that one of the most prominent grooves in the region of the temporoparietal lobe is associated with the direct vascular course and l