Pain science- revision

What term is used to describe the minimum stimulus required to elicit a transmitted response from a sensory receptor ?

With regard to nociception, which of the following statements is FALSE?

• C fibres are unmyelinated and transmit information relatively slowly

  -

• A-delta fibres are fast transmitting,nerve fibres

• C-fibres are myelinated and transmit information relatively slowly

• A-delta fibres are small diameter, myelinated nerve fibres

1)      Which of the following nerve fibres is responsible for transmitting fast, well localised, sharp pain?

• A delta fibres

• A beta fibres

• C fibres

• Broadband

How are most C fibre nociceptors characterised?

• High threshold mechanoreceptors

  (polymodal receptors)

• Low threshold chemoreceptors

• Low threshold, thermal-mechanical receptors

• High threshold chemoreceptors

Nociceptors respond to three different types of noxious stimuli. When these stimuli exceed their normal parameters, causing rapid, increased firing of the sensory receptors we begin to experience pain. Can you name the 3 different types of noxious stimuli?

• Chemical, thermal, mechanical

• mild, moderate, severe

• Deep, superficial, localised

• Transient, sustained, chronic

Nociception is typically described as occurring in 4 stages: Transduction, transmission, perception and.....

• location

• modulation

• summation

• convergence

The dorsal horn has a very organised structure and is divided into ten layers. What do we call these layers?

Where is the pain gate mechanism thought to take place?

• Dorsal root ganglion

• Dorsal root

• Dorsal horn

• Dorsal tracts

Physiologically, pain occurs when sensory nerve endings come into contact with a painful or noxious stimulus. What do we call these free nerve endings?

• Motor end plate

• Synapses

• Mechanoreceptors

• Nociceptors

Which fibres activate the inhibitory interneurons which essentially ‘close the pain gate’ according to the pain gate theory?

• A delta

• A beta

• C fibres

• A alpha