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Clinical Neuroscience E-Book

Clinical Neuroscience E-Book

Paul Johns

(2014)

Additional Information

Abstract

This book provides a clear and readable introduction to the central concepts of clinical neuroscience. The first part of the book deals with fundamental areas of neuroscience required for a sound understanding of brain disease. This is followed by an account of the neurobiology of the most common and important brain diseases of the western world (stroke, epilepsy, Alzheimer's disease, Parkinson's disease and multiple sclerosis). The book is in the same general style as the successful Crossman: Neuronatomy with extensive colour illustrations.
Short, affordable and readable introductory level text in the smae style as Crossman: Neuroanatomy.
Assumes little previous neuroscience knowledge.
Explains fundamental concepts without overwhelming detail
Focuses on clinically relevant material.
Includes the most common and important neurological disorders.

Table of Contents

Section Title Page Action Price
Front cover cover
Half title page i
Clinical Neuroscience ii
Copyright page iv
Dedication v
Preface vi
Acknowledgements vii
Table of Contents viii
1 Overview of the nervous system 1
Chapter contents 1
Parts of the nervous system 1
Central and peripheral nervous systems 1
Autonomic nervous system 1
Divisions of the ANS 3
Cells of the nervous system 4
Nerve cells (neurons) 4
Grey and white matter 5
Neuroglial cells 5
Basic cerebral topography 6
Cerebrum 6
Crossing of sensory and motor pathways 6
Lateralization of function 6
Internal anatomy 6
Pituitary gland 6
Hemispheric white matter 8
Cerebellum 10
Cerebellar peduncles 10
Brain stem 11
Reticular formation 11
Diffuse neurochemical systems 11
The spinal cord 13
Internal anatomy 13
Protective coverings of the CNS 14
The skull and vertebral column 14
Cranial and spinal meninges 14
Subarachnoid space 15
Dural compartments 15
Subarachnoid cisterns 16
2 Development of the brain 19
Chapter contents 19
Neural tube formation 19
Origin of neurons and glial cells 19
Formation of the cerebral cortex 20
Sensory and motor areas 20
The neural crest 21
Divisions of the brain 21
Flexures and the neuraxis 22
Expansion of the telencephalon 22
Formation of gyri and sulci 23
Development of the cerebellum 24
Ventricular system 25
Circulation of CSF 26
3 Functional neuroanatomy 27
Chapter contents 27
Cerebral cortex 27
Frontal lobe 27
Lateral aspect (Figs 3.1 and 3.4A) 27
Medial aspect (Figs 3.2 and 3.4B) 27
Inferior (orbitofrontal) aspect (Fig. 3.3) 27
Prefrontal cortex (Figs 3.3 and 3.4) 29
Parietal lobe 29
Lateral aspect (Figs 3.1 and 3.4A) 30
4 Sensory and motor pathways 49
Chapter contents 49
Spinal segments 49
Internal anatomy of the spinal cord 49
Somatic sensory pathways 50
Dorsal column pathway 50
Gracile and cuneate fasciculi 50
Pathway to the cerebral cortex (Fig. 4.4) 50
Spinothalamic tract 51
Pathway to the cerebral cortex (Fig. 4.5) 52
The spinoreticulothalamic pathway 52
Pain arising from the internal organs 53
Visceral and viscerosomatic pain 53
Referred pain 53
Sensory gating and antinociception 53
Supraspinal influences 53
Trigeminothalamic pathways 54
General tactile sensation 54
Pain and temperature 54
Somatic motor pathways 55
Corticospinal tract 55
Origin, course and destination (Fig. 4.12) 55
Corticobulbar tract 55
Termination of corticobulbar fibres 56
Decussation of bulbar fibres 56
Lower motor neurons 56
Motor units and graded contraction 56
The neuromuscular junction 56
Reflexes and muscle tone 57
Muscle tone 57
The stretch reflex 57
The gamma loop 57
Long-latency stretch reflex 57
Hypertonia and spasticity 57
Spasticity 58
The flexor reflex 59
5 Neurons and glial cells 61
Chapter contents 61
Nerve cells 61
Cortical neurons 61
Pyramidal and granule cells (Fig. 5.1A & B) 61
Cortical lamination 61
Different types of cortex 61
Features of the neuron 61
Dendritic spines 62
Subcellular organelles 62
Lipofuscin and neuromelanin 63
Vesicles 63
The neuronal cytoskeleton 63
Microtubules 63
Neurofilaments 63
Microfilaments 64
Axonal transport 64
Astrocytes 64
Astrocyte functions 64
The blood–brain barrier (Fig. 5.8B) 64
Energy metabolism 65
The glutamate–glutamine shuttle (Fig. 5.9) 65
Oligodendrocytes and Schwann cells 66
Myelination 66
Composition of myelin 66
Saltatory conduction 66
Other glial cells 67
Microglia 67
Ependymal cells 68
Glial tumours 68
General features of gliomas 68
Classification and grading 68
Molecular genetics 69
Management of gliomas 69
6 Electrical signalling in neurons 71
Chapter contents 71
The neuron at rest 71
Origin of the resting membrane potential 71
The sodium pump 71
Ionic basis of the resting membrane potential 72
Calculating the equilibrium potential 72
Effect of membrane permeability 73
The reversal potential 73
Excitability 75
Types of ion channel 75
Gated channels 75
Channel kinetics 75
Voltage-gated channel structure 75
Sodium and potassium channels 75
The action potential 76
Properties of the action potential 76
Nerve impulse generation 76
Frequency coding 76
Refractory periods 76
Ionic basis of the action potential 77
Depolarization (Na+ influx) 77
Repolarization (K+ efflux) 77
Summary of ionic events 78
Axonal conduction 78
Passive current flow 78
Conduction in unmyelinated fibres 78
Antidromic conduction 79
Axonal conduction velocity 79
Myelination and membrane capacitance 79
Conduction in myelinated fibres 80
7 Synaptic transmission 81
Chapter contents 81
General principles 81
Electrical synapses 81
Chemical synapses 81
General structure (Fig. 7.2) 81
Excitatory and inhibitory synapses (Fig. 7.3) 82
Release of neurotransmitter (Fig. 7.4) 82
Mechanism of membrane fusion 82
Transmitter inactivation 83
Neurotransmitters 83
Classical neurotransmitters 83
Amino acid transmitters 83
Biogenic amines 83
Other signalling molecules 84
Neuropeptides 84
Nitric oxide 84
Postsynaptic receptors 85
Types of receptor 85
Ionotropic receptors 85
Metabotropic receptors 85
Glutamate receptors 85
Ionotropic glutamate receptors 86
Non-NMDA receptors 86
NMDA receptors and calcium 86
Metabotropic glutamate receptors 86
Memory and learning 87
Associative phenomena 87
GABA receptors 87
Ionotropic GABA receptors 87
Metabotropic GABA receptors 87
Synaptic integration 87
Spatial and temporal summation 87
8 Cellular mechanisms of neurological disease 91
Chapter contents 91
Neuronal injury and death 91
Necrosis 91
Apoptosis 92
Caspases 92
Extrinsic pathway (Fig. 8.2) 92
Intrinsic pathway (Fig. 8.3) 92
Disposal of the cell 93
Axonal damage 93
Transneuronal degeneration (Fig. 8.4) 93
Axonal regrowth 94
Cell death mechanisms 94
Excitotoxicity 94
The role of calcium 94
Oxidative stress 94
Nitric oxide 95
Inflammation and gliosis 95
Reactive gliosis 95
Astrocytosis (Fig. 8.7) 95
Microgliosis (Fig. 8.8) 96
Acute and chronic inflammation 96
Inflammation in the CNS 96
Neurodegeneration 97
General features 97
Neuronal loss and gliosis 97
Protein folding and misfolding 97
Normal protein folding 97
Unfolded protein response 97
Disposal of abnormal proteins 97
The autophagy-lysosomal pathway 98
Protein aggregation 99
Amyloid 99
Amyloid fibril formation 99
Amyloid diseases 99
Amyloid toxicity 99
Prion diseases 100
General characteristics 100
Infectivity 101
Prion protein 101
Codon 129 101
Conversion of PrPc to PrPSc 102
Conversion models 102
9 Head injury 105
Chapter contents 105
Clinical aspects 105
Assessment and management 105
Outcome following head injury 106
Pathology of head injury 106
Cerebral contusions 106
Coup and contrecoup lesions (Fig. 9.3) 106
Intracranial haemorrhage 107
Extradural haemorrhage 107
Subdural haemorrhage 107
Intracerebral haemorrhage 108
Diffuse axonal injury 109
Microscopic appearances 109
Skull fracture 110
Brain swelling and intracranial pressure 110
Raised intracranial pressure 110
Brain shift and herniation 111
Types of herniation (Fig. 9.11) 111
Secondary infarction 112
Brain blood flow and ICP 112
Regulation of brain blood flow 112
Minor head injury 113
Concussion 113
Repeated minor head injury 113
10 Stroke 115
Chapter contents 115
Types of stroke 115
Ischaemic stroke 115
Large vessel and cardioembolic stroke 116
Small vessel disease 116
Transient ischaemic attacks 117
Haemorrhagic stroke 117
Blood supply to the brain 117
Anterior circulation 117
Posterior circulation 117
Circle of Willis 118
Perforating vessels 118
Blood supply to the brain stem 121
Blood supply to the cerebellum 121
Stroke syndromes 122
Atherosclerosis 122
Atheromatous plaques 122
Plaque formation 123
Plaque progression 123
Stroke management 123
Stroke prevention 123
Risk factors for stroke 124
Other factors 124
Pathophysiology of stroke 125
The ischaemic cascade (Fig. 10.16) 125
Failure of ATP production 125
Anaerobic respiration 125
Failure of the sodium pump 125
Calcium and excitotoxicity 125
The ischaemic penumbra 126
Neuroprotection 126
Animal models of stroke 126
Dissociated neuronal cultures 126
Whole animal studies 126
Organotypic cultures 126
Neuroprotective agents 127
Temporal factors 127
Problems with animal models 127
Outcome measures 127
Failure of drug delivery 127
White matter ischaemia 127
Delayed neuronal cell death 128
Reperfusion injury 128
Nitric oxide release 128
Delayed apoptosis 128
11 Epilepsy 129
Chapter contents 129
Types of seizure 129
Primary generalized seizures 129
Partial (focal) seizures 129
General aspects 129
Aetiology of epilepsy 131
Common seizure patterns 131
Complex partial seizures 131
Generalized tonic-clonic seizures 131
Tonic phase (30 seconds) 131
Clonic phase (60 seconds) 132
Postictal coma (up to 30 minutes) 132
Absence seizures 132
Genetic factors in epilepsy 132
Inherited seizure disorders 132
Diagnosis and management 133
Anti-epileptic drugs (AEDs) 133
Mechanisms of action 133
Sodium channel antagonists 133
Calcium channel antagonists 134
GABA potentiators 134
Glutamate modulators 135
Failure of anti-epileptic drugs 135
Pharmacoresistance 135
Surgery in epilepsy 135
Types of procedure 135
Neuropathology of epilepsy 135
Hippocampal sclerosis 136
Microscopic features 136
Aetiology of hippocampal sclerosis 136
Malformations of cortical development 137
Focal cortical dysplasia (FCD) 137
Glioneuronal tumours 138
Partial seizure mechanisms 139
Animal models of epilepsy 139
Acute seizure models 139
Chronic seizure models 139
Genetic seizure models 140
Electrical basis of epilepsy 140
Pathophysiology of epilepsy 140
Increased excitation/decreased inhibition 140
Alterations in connectivity 140
Changes in receptors and ion channels 140
Changes in inhibitory peptides 141
The role of astrocytes 141
Mechanism of absence seizures 141
The thalamic relay and sleep 141
Origin of thalamic bursting 142
Origin of absences 142
Sudden death in epilepsy 142
Cause of death 143
Psychological aspects 143
Association with psychiatric illness 144
Mood disorders in epilepsy 144
Psychosis in temporal lobe epilepsy 144
Postictal psychosis 144
Interictal psychosis 144
Seizures and psychosis 144
12 Dementia 145
Chapter contents 145
General aspects 145
Clinical features 145
Assessment and diagnosis 145
Psychometric testing 145
Types of dementia 145
Reversible causes 145
Alzheimer’s disease 147
Clinical aspects 147
Memory loss 147
Visuospatial problems 147
Reasoning and language 147
Psychiatric features 147
Neuroimaging 147
Progression and death 147
Risk factors 148
Apolipoprotein E 148
Other genetic factors 148
Protective factors 149
Pathological features 149
Plaques (Fig. 12.5) 149
Neurofibrillary tangles (Fig. 12.6) 149
Neuronal and synaptic loss 150
Pathogenesis of Alzheimer’s disease 150
Formation of amyloid beta 150
Amyloid processing 151
Primary (alpha) pathway 151
Alternative (beta) pathway 151
Ratio of Aβ40 to Aβ42 151
Formation of neurofibrillary tangles 152
Amyloid beta clearance 153
Mechanisms for Aβ removal 153
Pathological effects of amyloid beta 153
Toxic oligomeric species 153
Pathological ageing and cognitive reserve 154
Treatment of Alzheimer’s disease 154
Pharmacological agents 155
Disease-modifying agents 155
Dementia with Lewy bodies 155
Clinical features 155
Psychological testing and neuroimaging 156
Pathological features 156
Lewy bodies 156
Progression of pathology 156
Vascular dementia 156
Clinical features 156
Distinction from Alzheimer’s disease 157
Pathological features 158
Small vessel disease 158
Large vessel disease 159
Frontotemporal dementia 159
Clinical features 159
Frontotemporal dementia subtypes 159
Behavioural variant of FTD 159
Semantic dementia 160
Progressive non-fluent aphasia 161
FTD and motor neuron disease 161
Pathological features 161
Molecular classification 161
Genetic factors in FTD 161
13 Parkinson’s disease 163
Chapter contents 163
Clinical features 163
Akinesia 163
Muscular rigidity 163
Abnormal posture and gait 163
Rest tremor 163
Other features 163
Diagnosis and course 164
Parkinsonism 164
Drug-induced parkinsonism 165
Vascular pseudoparkinsonism 165
Neurodegenerative causes 165
Progressive supranuclear palsy 165
Multiple system atrophy 165
Pathology of Parkinson’s disease 166
Neuronal loss 166
Lewy bodies 166
Progression of Lewy body pathology 167
Alpha-synuclein 167
Familial Parkinson’s disease 168
Autosomal dominant PD 168
Autosomal recessive PD 169
Treatment of Parkinson’s disease 169
Dopamine replacement 169
Problems with levodopa therapy 169
Reduction in efficacy 169
Side effects of levodopa 170
Other agents 171
Anticholinergics 171
Amantadine 171
Enzyme inhibitors 171
Dopamine receptor agonists 171
Surgery in Parkinson’s disease 171
Deep brain stimulation (DBS) 172
Pathophysiology 172
The voluntary motor loop 172
Afferent and efferent connections 173
Projections into the basal ganglia 173
Outflow of the basal ganglia 173
Direct and indirect pathways 174
Direct pathway 174
Indirect pathway 174
Basal ganglia oscillations 176
Aetiology and pathogenesis 176
Risk factors 176
Environmental factors 176
Frozen addict syndrome 176
MPTP in animal models 176
Mechanism of MPTP toxicity 177
Mitochondria and oxidative stress 177
Protein aggregation 177
Neurotoxicity of alpha-synuclein 177
Abnormal phosphorylation 178
Dysfunction of the ubiquitin-proteasome system 178
Interaction of pathogenetic mechanisms 178
14 Multiple sclerosis 181
Chapter contents 181
Demyelination 181
Clinical features of MS 181
Common symptoms 181
Loss of vision 181
Pain and fatigue 181
Paroxysmal symptoms 182
Cognitive and emotional changes 182
Bladder, bowel and sexual dysfunction 182
Cerebellar features 182
Temperature sensitivity 183
Course and progression 183
Relapsing-remitting MS 183
Secondary progressive MS 184
Primary progressive MS 184
Diagnosis and management 184
Diagnosis 184
Neuroimaging 184
Oligoclonal bands 185
Visual evoked potentials 185
Management 185
Disease-modifying drugs (DMDs) 185
Interferon beta 185
Glatiramer acetate 186
Natalizumab 186
Fingolimod 186
Unlicensed drugs 186
Long-term supportive care 186
Pathological features 187
MS plaques 187
Plaque distribution 187
Acute and chronic plaques 187
Remyelination 188
Failure of remyelination 188
Aetiology 189
Genetic and immunologic factors 189
Environmental factors 189
Migration studies 189
Sunlight and vitamin D 190
Viral and other infections 190
Animal models of MS 190
Autoimmune models 191
Viral models 191
Chemically-induced models 191
Genetic models 191
Pathogenesis 191
Inflammatory cells 192
Macrophages 192
T-lymphocytes 192
B-lymphocytes 192
Impact on axonal conduction 193
Types of active plaque 193
Neurodegeneration in MS 194
Axonal damage 194
Mechanism of axonal injury 194
Loss of demyelinated axons 195
Cortical demyelination 195
Appendix Anatomical language 197
Index 199
A 199
B 199
C 200
D 201
E 201
F 202
G 202
H 202
I 202
J 203
K 203
L 203
M 203
N 204
O 204
P 205
Q 206
R 206
S 206
T 207
U 207
V 207
W 207
X 207