• Frontal, temporal & occipital poles
• Frontal, temporal, parietal, & occipital lobes
• Key gyri
– Precentral
– Postcentral
– Precuneus
– Calcarine
– Cingulate
– Operculum
• Hippocampus & components
Category 2
• Important gyri
– Frontal
– Orbital
– Superior parietal & paracentral lobules
– Gyrus rectus
– Supramarginal and angular
– Cuneus
– Lingual
– Occipitotemporal
– Temporal
• Parahippocampal gyrus & subiculum
Category 3
• Other gyri
– Pyriform cortex
– Insular gyri
Hippocampus |
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A convex elevation of grey matter tissue within the parahippocampal gyrus inside the inferior temporal horn of the lateral ventricle. It is an important component of the limbic system.
Location
The parahippocampal gyrus and cingulate sulci are located on the medial surface of the hemisphere, forming a C-shaped ring.
The hippocampus spans 5cm from the anterior end at amygdala to posterior end near the splenium of the corpus callosum. It is divided into a head, body, and tail. The head is expanded and bears two or three shallow grooves called pes hippocampi. The head of the hippocampus is part of the posterior half of the triangular uncus and is separated inferiorly from the parahippocampal gyrus by the uncal sulcus. The alveus is covered by the ependymal inside the ventricular cavity.
Structure
The hippocampus has three distinct zones:
- Dentate gyrus – small part of the hippocampus and lies between the fimbria and the parahippocampal gyrus
- Hippocampus proper
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Subiculum – the transitional zone between the cortex of the parahippocampal gyrus and that of the hippocampus
Blood supply
The anterior choroidal artery runs medially and superiorly to the uncus, between the ambient and semilunar gyrus. Perforating arteries reach the deeper structures.
Relations