Region I of hippocampus proper

Region I of hippocampus proper
Diagram of hippocampal regions in a rat brain.
Basic circuit of the hippocampus, shown using a modified drawing by Ramon y Cajal. DG: dentate gyrus. Sub: subiculum. EC: entorhinal cortex
Details
Identifiers
Latin	regio hippocampi proprii I; regio I cornus ammonis; CA1
NeuroNames	hier-165
TA	A14.1.09.328
FMA	74042
*Anatomical terms of neuroanatomy* [edit on Wikidata]

Region I of hippocampus proper (CA1) is a portion of the hippocampal formation. CA stands for the latin cornus ammonis.

Region CA1, or Area CA1 is the first region in the hippocampal circuit that yields a significant output pathway, which goes to entorhinal cortex layer V. It also sends significant output forward to the subiculum. Like CA3, it receives input from superficial entorhinal cortex along the perforant pathway (some authors only consider the input to DG and CA3 to be the perforant pathway, referring to the input to CA1 as the temporoammonic pathway). Unlike CA3, however, it contains very few recurrent connections. In the rat, CA1 contains approximately 250,000 pyramidal cells.

Additional images

Hippocampus

Rostral basal ganglia of the human brain and associated structures

Basal ganglia

Grey matter

Corpus striatum	Dorsal striatum Putamen Caudate nucleus Ventral striatum Nucleus accumbens Olfactory tubercle Globus pallidus GPe GPi

Other	Amygdala Claustrum

White matter

Semioval center

Internal capsule

Corona radiata

Rhinencephalon

Grey matter	Anterior olfactory nucleus Anterior perforated substance Olfactory bulb

White matter	Olfactory tract Medial olfactory stria Lateral olfactory stria Olfactory trigone

Other basal forebrain

Grey matter	Substantia innominata Nucleus basalis of Meynert Nucleus of diagonal band

White matter	Diagonal band of Broca Stria terminalis

Archicortex:
Hippocampal formation/
Hippocampus anatomy

Grey matter	Hippocampus proper CA1 CA2 CA3 CA4 Dentate gyrus Fascia dentata Subiculum

White matter	Alveus Fimbria Perforant path Schaffer collateral

Papez circuit pathway

Diencephalon	Mammillary body → Mammillothalamic tract → Anterior nuclei of thalamus →

Telencephalon	Anterior limb of internal capsule → Cingulate gyrus → Cingulum → Parahippocampal gyrus → Entorhinal cortex → Perforant path → Hippocampus/Hippocampal formation (CA3 → CA1 → Subiculum) → Fornix →

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