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6 Cards in this Set

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Circuit of Papez
(hippocampal formation)
Hippocampus
Alveus (of hippocampal formation)
Fibriae (of hippocampal formation)
Fornix
Mammillary Bodies
Ant Nucleus of Thalamus (via Mammillothalamic tract)
Cingulate gyrus (via Internal Capsule)
Amygdala
back to Hippocampus
Perforant pathway
(of hippocampus)
Entorhinal cortex (layers 2 and 3)
Dentate granule cell layer
CA3 (via mossy fibers) [and fornix]
CA1 (via Schaffer collaterals) [and fornix]
Subiculum [and fornix]
Entorhinal cortex (layers 2 and 3) [and fornix]
-Steps 1-3 involved in Long-term potentiation
-Only step 1 and 3 (not 2) need pre and post synaptic activation for LTP.
Alvear pathway
(of hippocampus)
Entorhinal cortex (layer 2 and 3)
CA1 and CA3 [and fornix]
Subiculum
Basal Ganglia
(basic pathway)
Cortex (Glutamate) to Putamen
Cortex (Glutamate) to STN
Putamen=D1 (GABA, Sub P, dynorphin), D2 (GABA, enkephalin)
- D2: inhibits GPe
- D1: inhibits GPi/SNr
-SNc=D2 (inhib with Dopamine), D1 (stim with Dopamine)
-GPe=GABA inhib STN and GPi/SNr
-STN=Glutamate stim GPi/SNr
-GPi/SNr=GABA inhib VL thalamus
-VL thalamus=Glutamate to Cortex
Indirect Pathway=decrease movement
Direct Pathway=increase movement
Ventral Amygdalofugal pathway
(Amygdala)
"the shortcut" pathway
-to Septal nuclei (via diagnoal band of Broca), nucleus Basalis, ventral striatum, and mediodorsal nucleus of the thalamus.
-Recall: Mediodorsal nucleus of the thalamus serves as limbic relay to frontal lobes.
-bidirectional signals to hypothalamus for homeostatic alertness.
-to brainstem nuclei such as the nucleus solitarius, parabrachial nucleus, dorsal motor nucleus of the vagus, periaqueductal gray, and reticular formation.

Connections between the amygdala, hypothalamus, and brainstem travel in the medial forebrain bundle.
Compare to Stria Terminalis
Stria Terminalis
(Amygdala)
"the long way around"
C-shaped structure that runs from the amygdala along the wall of the lateral ventricle to reach ultimately the hypothalamus and septal area.
-The "fornix" of the amygdala
-Information from corticomedial amygdala to ventromedial hypothalamus that may increase/decrease appetite depending on odor
Compare to Ventral Amygdalofugal pathway