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Aging of the Nervous System: Functional Changes. P.S. Timiras. Acetic acid. Choline. AChE inhibitor. Acetylcholinesterase Inhibition. Presynaptic nerve terminal. Muscarinic receptor. Postsynaptic nerve terminal. Nicotinic receptor. Acetylcholine (ACh). Acetylcholinesterase (AChE).

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Aging of the Nervous System: Functional Changes

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Aging of the nervous system functional changes

Aging of the Nervous System:Functional Changes

P.S. Timiras


Aging of the nervous system functional changes

Acetic acid

Choline

AChE inhibitor

Acetylcholinesterase Inhibition

Presynaptic nerve terminal

Muscarinic receptor

Postsynaptic nerve terminal

Nicotinic receptor

Acetylcholine(ACh)

Acetylcholinesterase(AChE)

Nordberg A, Svensson A-L. Drug Safety. 1998;19:465-480.


Aging of the nervous system functional changes

Again, in the normal aging brain the changes are relatively few. However impaired function and increased pathology do occur.

Major functional deficits/ pathologies involve:

Motility (e.g. Parkinson’s Disease)

Senses and communication

Cognition (e.g. dementias)

Affect and mood (e.g. depression)

Blood circulation (stroke, multi-infarct dementia)

Parkinson’s Disease: Chapter 8, pp. 110-113

Dementias: Chapter 8, pp. 130-136


Control of posture balance and mobility

Control of Posture, Balance and Mobility

Skeletal Muscles

Bones and Joints

Hormones

Blood Circulation

Central Nervous System

  • Cerebral Cortex

  • Basal Ganglia

  • Cerebellum

  • Vestibular-ocular & proprioceptive pathways

  • Limbic System

  • Spinal Cord


Aging of the nervous system functional changes

  • With aging, normal adult gait changes to:

  • Hesitant

  • broad based

  • small stepped

  • Stooped posture

  • Diminished arm swings

  • Turns performed en bloc

  • With Parkinson’s, there is also:

  • Rigidity

  • Tremors (at rest)

  • Akinesia (loss of power of movement)

  • Bradykinesia (slowed movement)

  • Pathology of Parkinson’s entails:

  • Presence of Lewy bodies

  • Loss of dopaminergic neurons in the substantia nigra


Definition of dementia

Definition of Dementia

Dementia (from the Latin de-mens, without mind) is a clinical syndrome that refers to a global deterioration of intellectual and cognitive functions characterized by a defect of all five major mental functions:

  • Orientation

  • Memory

  • Intellect

  • Judgment

  • Affect

    But with persistence of a

    clear consciousness.


Dementia cont

Dementia (cont.)

  • There are two types of dementia:

    • Reversible

    • Irreversible


Aging of the nervous system functional changes

From Table

8.10


Aging of the nervous system functional changes

Learning at all Ages Induces Successful Aging


Aging of the nervous system functional changes

  • For further information on brain plasticity in old age and factors which may enhance this plasticity, see the below papers (full texts are available on the course website under “Relevant Articles”):

  • Merabet LB et al. What blindness can tell us about seeing again: merging neuroplasticity and neuroprostheses. Nat Rev Neurosci 2005, 6(1) 71-77.

  • Adlard PA et al. Voluntary exercise decreases amyloid load in a transgenic model of Alzheimer's disease. J. Neuroscience 2005, 25(17), 4217-4221.

  • Colcombe S, Kramer AF. Fitness effects on the cognitive function of older adults: a meta-analytic study. Psychol Sci 2003, 14(2), 125-130.

  • van Praag H et al. Exercise enhances learning and hippocampal neurogenesis in aged mice. J Neuroscience 2005, 25(38), 8680-8685.


Aging of the nervous system functional changes

END


Amyloidal connection

Amyloidal Connection


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