Subiculum

The subiculum (Latin for "support") also known as the subicular complex, or subicular cortex, is the most inferior component of the hippocampal formation. It lies between the entorhinal cortex and the CA1 hippocampal subfield. The subicular complex comprises a set of four related structures including the prosubiculum, presubiculum, postsubiculum and parasubiculum.

The subiculum (Latin for "support") also known as the subicular complex, or subicular cortex, is the most inferior component of the hippocampal formation. It lies between the entorhinal cortex and the CA1 hippocampal subfield. The subicular complex comprises a set of four related structures including the prosubiculum, presubiculum, postsubiculum and parasubiculum. ==Name== The subiculum got its name from Karl Friedrich Burdach in his three-volume work Vom Bau und Leben des Gehirns (Vol. 2, §199). He originally named it subiculum cornu ammonis and so associated it with the rest of the hippocampal subfields. ==Structure== The subicular complex receives input from CA1 and entorhinal cortical layer III pyramidal neurons and is the main output of the hippocampus proper. The pyramidal neurons send projections to the nucleus accumbens, septal nuclei, prefrontal cortex, lateral hypothalamus, nucleus reuniens, mammillary nuclei, entorhinal cortex and amygdala. The pyramidal neurons in the subiculum exhibit transitions between two modes of action potential output: bursting and single spiking. The transitions between these two modes is thought to be important for routing information out of the hippocampus. Four component areas have been described: parasubiculum (adjacent to the parahippocampal gyrus), presubiculum, postsubiculum, and prosubiculum. ==Function== It is believed to play a role in some cases of human epilepsy. It has also been implicated in working memory and drug addiction. It has been suggested that the dorsal subiculum is involved in spatial relations, and the ventral subiculum regulates the hypothalamic-pituitary-adrenal axis. ==Clinical significance== ===Potential role in Alzheimer's disease=== Rat studies indicate that lesioning of the subiculum decreases the spread of amyloid-beta in rat models of Alzheimer's disease. Alzheimer's disease pathology is thought to have prion-like properties. The disease tends to spread in characteristic sequence from the entorhinal cortex through the subiculum. ==Additional images== File:CajalHippocampus (modified).png|Basic circuit of the hippocampus ==References== ==External links== Photo Photo

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