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Dentate gyrus
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<p>The dentate gyrus (DG) is one of the <a href="/facts/Hippocampal_subfields/7zqI8mXG">subfields</a> of the <a href="/facts/Hippocampus/X7CqbP8X">hippocampus</a>, in the <a href="/facts/Hippocampal_formation/WR8eRp58">hippocampal formation</a>. The hippocampal formation is located in the <a href="/facts/Temporal_lobe/U2wLVCrg">temporal lobe</a> of the <a href="/facts/Brain/EKla9NkJ">brain</a>, and includes the <a href="/facts/Hippocampus/X7CqbP8X">hippocampus</a> (including CA1 to CA4) subfields, and other subfields including the dentate gyrus, <a href="/facts/Subiculum/K1NBvTBq">subiculum</a>, and <a href="/facts/Presubiculum/JC26sdBK">presubiculum</a>. </p><p>The dentate gyrus is part of the <a href="/facts/Trisynaptic_circuit/2gL9rJzY">trisynaptic circuit</a>, a neural circuit of the hippocampus, thought to contribute to the formation of new <a href="/facts/Episodic_memory/1QIEM9gQ">episodic memories</a>, the spontaneous exploration of novel environments and other functions. The dentate gyrus has toothlike projections from which it is named. </p><p>The <a href="/facts/Subgranular_zone/31Xvb9PG">subgranular zone</a> of the dentate gyrus is one of only two major sites of <a href="/facts/Adult_neurogenesis/U2VuCgKu">adult neurogenesis</a> in the brain, and is found in many <a href="/facts/Mammal/phSwTzBo">mammals</a>. The other main site is the <a href="/facts/Subventricular_zone/o9Jv3pA1">subventricular zone</a> in the <a href="/facts/Ventricular_system/VMuY39Kp">ventricular system</a>. Other sites may include the <a href="/facts/Striatum/MjNnTjSd">striatum</a> and the <a href="/facts/Cerebellum/kBRS2Lou">cerebellum</a>. However, whether significant neurogenesis takes place in the adult human dentate gyrus has been a matter of debate. </p>