Intro lecture

Question 1

Aß fibres

Myelinated

Large diameter

Answer 1

Sensory Modality:

• Light touch
• Pressure
• Vibration

Axon diameter:

• about 10-15 micrometres

Conduction Velocity:

• about 25-80m/s

Question 2

A-delta fibres

smaller also myelinated

Answer 2

Sensory modality:

• Heat
• Cold
• Nocioception

Axon diameter:

• about 2-5 micrometres

Conduction velocity:

• about 2-25 m/s

Question 3

C fibres

non-myelinated

small diameter

Answer 3

Sensory modality:

• heat
• cold
• nocioception
• itch

Axon Diameter:

• <1 micrometer

Conduction velocity:

• <1m/s

Question 4

Neurology

defintion

Answer 4

Diagnosis and treatment of neural dysfunction

The emphais is on direct identification or deduction of physical causes and rational therapy

Question 5

Psychiatry

Answer 5

Diagnosis and treatment of mental dysfunction

emphasis on psychological, social and behavioural causes though physical measurements are sometimes taken.

Therapy is pragmatic and experimental

Question 6

Psychology

Answer 6

The study of processes underlying mental function

Includes experimential and clinical approaches to understanding of higher order brain functions such as dictate personality.

Question 7

Main imaging techniques

used to investigate CNS function

Answer 7

• EEG - Electroencephalogram
• CAT scans - Computer aided tomography
• PET - Positron emission tomography
• MRI - magnetic resonance imaging
• fMRI- functional MRI