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Hippocampal circuit in rodent hippocampus. Connections between CA3 and CA1 regions with parahippocampal structures is shown. The trisynaptic loop, as the main circuit of the hippocampus responsible for information transfer between the hippocampus and the cortex, is also the circuit producing SWRs. This circuit provides the pathway by which SWRs ...
The hippocampal theta rhythm is a strong oscillation that can be observed in the hippocampus and other brain structures in numerous species of mammals including rodents, rabbits, dogs, cats, and marsupials.
The hippocampal subfields are four ... pathway goes to layer V of the entorhinal cortex. ... with the peaks of the superimposed gamma oscillation. ...
The entorhinal cortex (EC) is a structure in the brain located in the medial temporal lobe.The EC is composed of six distinct layers. The superficial (outer) layers, which include layers I through III, are mainly input layers that receive signals from other parts of the EC, but also project to hippocampal structures via the perforant path.
This has meant the study of hippocampal activity has been largely restricted to that of the rat and less often the mouse. [2] Theta rhythm with its low frequency of around 6–7 Hz in a steady oscillation has been observed in rats that are motionless but alert. This extends to that sleeping cycle characterised by rapid eye movement (REM).
Phase precession in the entorhinal cortex has been hypothesized to arise from an attractor network process, so that two sequential neural representations within a single cycle of the theta oscillation can be temporally linked to each other downstream in the hippocampus, as episodic memories. [13]
The hippocampal formation is a compound structure in the medial temporal lobe of the brain. It forms a c-shaped bulge on the floor of the inferior horn of the lateral ventricle. [1] Typically, the hippocampal formation is said to included the dentate gyrus, the hippocampus, and the subiculum. [2]
The hippocampus (pl.: hippocampi; via Latin from Greek ἱππόκαμπος, 'seahorse'), also hippocampus proper, is a major component of the brain of humans and many other vertebrates. In the human brain the hippocampus, the dentate gyrus, and the subiculum are the components of the hippocampal formation located in the limbic system.