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The calcar avis, previously known as the hippocampus minor, [1] is an involution of the wall of the lateral ventricle's posterior cornu produced by the calcarine fissure. [2] It is sometimes visible on ultrasonogram [3] and can resemble a clot. [4]
Lateral ventricles and horns The lateral ventricles connected to the third ventricle by the interventricular foramina. Each lateral ventricle takes the form of an elongated curve, with an additional anterior-facing continuation emerging inferiorly from a point near the posterior end of the curve; the junction is known as the trigone of the lateral ventricle.
The ventricles contained within the rhombencephalon become the fourth ventricle, and the ventricles contained within the mesencephalon become the aqueduct of Sylvius. Separating the anterior horns of the lateral ventricles is the septum pellucidum : a thin, triangular, vertical membrane which runs as a sheet from the corpus callosum down to the ...
The calcarine sulcus begins near the occipital pole in two converging rami. [1] It runs forward to a point a little below the splenium of the corpus callosum.Here, it is joined at an acute angle by the medial part of the parieto-occipital sulcus. [1]
The interventricular foramina are two holes (Latin: foramen, pl. foramina) that connect the left and the right lateral ventricles to the third ventricle. [1]They are located on the underside near the midline of the lateral ventricles, [2] and join the third ventricle where its roof meets its anterior surface. [3]
Transverse view of the caudate nucleus from a structural MR image. The head and body of the caudate nucleus form part of the floor of the anterior horn of the lateral ventricle. The body travels briefly towards the back of the head; the tail then curves back toward the anterior, forming the roof of the inferior horn of the lateral ventricle.
Coronal section of inferior horn of lateral ventricle. Fimbria labeled at center left and alveus to the right. Fimbria-fornix fibers are the hippocampal and subicular gateway to and from subcortical brain regions. [10] [11] Different parts of this system are given different names:
The hypothalamic sulcus (sulcus of Monro) is a groove in the lateral wall of the third ventricle, marking the boundary between the thalamus and hypothalamus.The upper and lower portions of the lateral wall of the third ventricle correspond to the alar lamina and basal lamina, respectively, of the lateral wall of the fore-brain vesicle and are separated from each other by a furrow, the ...