Anatomy of the Hippocampus
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1 Anatomy of the Hippocampus Lecture 3.2 David S. Touretzky September, 2015
2 Human Hippocampus 2
3 Human Hippocampus 3
4 Hippocampus Means Seahorse Dissected human hippocampus next to a specimen of hippocampus leria, one of several dozen species. 4
5 Rat Hippocampal Formation septal temporal From (Amaral & Witter, 1989) 5
6 Ammon: Egyptian god with ram's horns 6
7 Rat Hippocampal Formation septal temporal 7
8 Components of Hippocampal Formation The hippocampus contains CA1 - CA3. CA = Cornu Amonis (Ammon's horn) Ammon's Horn The hippocampal formation includes CA, dentate gyrus ( tooth-like bump ), entorhinal cortex, subiculum, pre- and parasubiculum. Hilus: reciprocally connected to DG. 8
9 Early Anatomy: Cajal's Drawings 9
10 Rat Hippocampus 10
11 Monkey Hippocampus 11
12 Human Hippocampus The volume of the human hippocampus is about 100 times that of the rat, and 10 times that of the monkey. 12
13 Basic Circuit Layer III perforant path EC Layer II perf. path DG Mossy fibers The mossy fiber synapse is one of the largest and most powerful synapses in the brain. CA3 Schaffer collaterals CA1 Recurrent collaterals 13
14 Connectivity Is Mostly Uni-Directional 14
15 What About CA2? Small relative to CA3 and CA1 Originally dismissed as a transitional area Driven by Schaffer collaterals from CA3 Projects back to CA3 and to two layers of CA1 Does not show activitydependent LTP as found in CA3 and CA1 In mice, contributes to social memory Caruana, Alexander, and Dudek (2012), Fig. 1 15
16 More of the Picture EC: entorhinal cortex Layer II projects to DG/CA3 Layer III projects to CA1/Sub mossy fibers project to CA Hilus mf CA3 Sch Schaffer collaterals to CA1 Sub Sub: subiculum DG CA1 CA3 pp DG: dentate gyrus CA1 & Sub project back to EC layer V Other cortical & subcortical areas EC 16
17 Even More PR: perirhinal cortex; POR: postrhinal cortex; EC: entorhinal cortex; PrS: presubiculum; PaS: parasubiculum; DG: dentate gyrus; CA: Cornu amonis; S: subiculum; RSP: retrosplenial cortex; Par/Oc: parietal/occipital cortex 17
18 Three Major Fiber Systems Angular bundle from EC: perforant path (and more) Fimbria/fornix to subcortical areas fimbria: red fornix: yellow Dorsal and ventral commissures link hippocampi dorsal: purple ventral: green 18
19 Alveus/Fimbria/Fornix Second input/output pathway for hippocampus (first is via angular bundle from EC) Communicates with subcortical structures: septal nuclei and mammillary bodies 19
20 (commissural pathway) (perforant path) 20
21 Dendritic Arborization of Principal Cells suprapyramidal blade infrapyramidal blade 21
22 Stucture of the Dentate Gyrus Granule cell layer holds principal cell bodies their axons form the mossy fiber pathway Molecular layer: gc dendritic tree; afferent connections Polymorphic cell layer (hilus): interneurons, mf collaterals 22
23 Mossy Fiber Synapse Onto CA3 Cells The dentate gyrus projection to CA3 terminates in large mossy fiber synapses. CA3 dendrites have thorny excresences with complex spine shapes. A mossy fiber can make synapses within one excresence. Each granule cell contacts only about 15 CA3 pyramidal cells. Each pyramidal cell receives input from only about 72 granule cells. 23
24 Structure of CA3 stratum radiatum: entorhinal afferents; mossy fibers enter from DG, make synapses in s. lucidum thorny excresences stratum lucidum stratum pyramidale stratum oriens: recurrent collaterals 24
25 Structure of CA1 stratum lacunosummoleculare: entorhinal afferents stratum radiatum: Schaeffer collaterals, commissural fibers stratum pyramidale stratum oriens 25
26 Interneurons in CA3/CA1 26
27 Structured Projections: EC Layer II vs. III EC layer II EC layer III 27
28 Layer II Projections MPP/LPP = medial/lateral perforant path 28
29 Layer III Projections 29
30 Temporal-Lobe.com 30
31 31
32 Some Numbers for the Rat Dentate Gyrus 1.2 million granule cells 4K basket cells 32K hilar interneurons (20K mossy cells) CA3/CA1 330K /420K pyramidal cells various interneurons Entorhinal cortex layer II Around 200K cells (20% interneurons?) Subiculum Around 180K cells 32
33 Rat Connectivity Perforant path projection to DG Around 4500 spines per granule cell (75% from EC) One EC cells makes about 18,000 synapses with granule cells CA3: three distinct inputs mossy fibers from DG 3,500 perforant path synapses from EC II 12,000 recurrent collaterals from other CA3 cells 8,000 to basilar dendrites (stratum oriens) 4,000 to apical dendrites (stratum radiatum) CA1: inputs from CA3 and EC From CA3 Schaffer collaterals: 4,500 basilar, 6500 apical synapses From EC layer III: 2,500 synapses 33
34 Why Does the Circuitry Look Like This? Why so many kinds of interneurons? Why have recurrent connections in some regions and not others? What do these regions compute? CA3 34
35 The Hippocampus Is Very Well Connected to Other Brain Areas Connected via EC and fimbria-fornix pathway to: Prefrontal / orbitorfrontal cortices Cingulate cortex Piriform cortex Perirhinal and Postrhinal cortices (sensory) Striatum Amygdala Septum Mammillary bodies Thalamus Hypothalamus 35
36 LEA/MEA = lateral/medial entorhinal area PER ` 36
37 Neuromodulatory Projections to HC NA: Attention 5HT: Mood DA: Reward ACh: Novelty locus coeruleus raphe nuclei substantia nigra acetylcholine medial septum 37
38 Hippocampal EEG Awake Active exploration: Resting: theta (8-12 Hz) plus gamma (40 Hz) LIA (Large-amplitude Irregular Activity) w/transient sharp waves Asleep REM sleep: theta Slow wave sleep: LIA S-SIA: small-amplitude irregular activity (Jarosiewicz & Skaggs) 38
39 Hippocampal EEG Awake (theta) ` REM sleep Sharp waves REM SIA Slow wave sleep (LIA) LIA S SIA LIA REM 39
40 What Does the Hippocampus Do? Formation of new episodic memories? Cognitive map? Anterograde amnesia (H.M. and others) Place cells in rats; spatial attention cells in monkeys Configural association theory? Lesioned rats are impaired on tasks requiring them to recognize cue configurations 40
41 A Hippocampal Prosthesis? Hampson et al (2013) Journal of Neural Engineering, 10(6). 41
42 Delayed Match to Sample Task 42
43 Effects of Stimulation 43
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