Study of hippocampal size and age

Luiz Gabriel Dias Duarte Machado, MBBS at School of Medicine La Sapienza University of Rome

Lior Mevorach, MBBS at School of Medicine La Sapienza University of Rome

Victor de Oliveira Corrêa, BA at School of Medicine University of Santo Amaro, Sao Paulo

Maria Eugênia Martins Publio Correa, BA at School of Medicine University of Santo Amaro, Sao Paulo

Gabriel Phillip Sinibaldi Eagers, BA at School of Medicine University of Santo Amaro, Sao Paulo

Guilherme Rodrigues Guidoni, BA at School of Medicine University of Santo Amaro, Sao Paulo

Antonio Santoro, Professor of Neurosurgery at School of Medicine La Sapienza University of Rome

Paulo Henrique Pires de Aguiar, Neurosurgeon of Sírio-Libanês Hospital

The hippocampus is a thoroughly studied structure of the temporal cerebral lobe due to its key role in the systems involved in learning, memory, emotional behavior, motor and homeostatic control.

It inferiorly borders the temporal horn of the lateral ventricle, resembling a seahorse, and is composed of a head with hippocampal digi-tations, a body and a tail, both with fimbriae. It is anatomically connected medially, ventrally and posteriorly to the fornix, and inferolaterally connected to the parahip-pocampal gyrus through the subiculum.

It contains a bilaminar internal structure comprised of the cornu ammonis (CA) and dentate gyrus (DG). Cornu ammonis can be subdivided into four structures according to its display of pyramidal neurons, namely from CA1, which is continuous with the subiculum, to CA, which is the nearest region to the DG.

The hippocampus is susceptible to different means of damage and, among them, epilepsy, hypoxia, ischemia, and encephalitis are associated with amnesic effects.

Cardiovascular disease, vascular risk factors, diabetes, obesity, obstructive sleep apnea, and psychiatric disorders, among others, are factors associated with hippocampal atrophy with increasing age. Moreover, pathologies of the brain related to a loss of hippocampal function, such as Alzheimer’s disease and dementia, are also associated with atrophy of the hippocampus and its internal structures.

The rate of hippocampal atrophy in cognitively normal individuals increases with age, which substantially increases onwards from midlife. In contrast to our current knowledge of hippocampal anatomy, neurophysiology and pathophysiology, scientific literature on the relationship between the hippocampal size and age is limited. Our study aims to further the understanding of this relationship.

DOI: https://doi.org/10.36253/ijae-11867

Read Full Text: https://oajournals.fupress.net/index.php/ijae/article/view/11867

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