Sensory pathways

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  • Created by: Jess
  • Created on: 14-05-14 16:50
Describe the primary afferent neurone.
Pseudounipolar cell, cell bodies lie in the spinal cord, distal axon contains sensory element and detects the stimulus, central axon conveys incoming info to the spinal cord
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Name the types of endings of proprioceptive and touch receptors.
Paccinian, Merkel and Ruffini.
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What type of endings do the pain and temperature fibres have?
Undifferentiated free nerve endings often found close to blood vessels.
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Which sensory fibres are myelinated and unmyelinated?
All A fibres are myelinated and C fibres are unmyelinated.
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Where do A alpha and beta fibres terminate?
In lamina 4 of the spinal cord.
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Where do A delta fibres terminate?
80% in lamina 1 of the spinal cord and the other 20% in lamina 5.
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Where do C fibres terminate?
In lamina 2 of the spinal cord.
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Which laminae of the spinal cord make up the dorsal horn?
Laminae 1-6.
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Which laminae of the spinal cord make up the ventral horn?
Laminae 7-9.
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Where is lamina 10 of the spinal cord located?
Surrounding the central canal.
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Where do axons that project via the dorsal columns end up?
At the gracile or cuneate nuclei.
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Where does the spinocervical tract first synapse and decussate?
It first synapses at the gracile or cuneate nucie and decussates at this point to the contralateral side of the medulla.
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What occurs after the first synapse in the spinocervical tract?
The axons rise via the medial lemniscus to the thalamus where they make synapses in the ventral posterior lateral nucleus. Projections from here go to the post central gyrus of the cerebral cortex (primary somatosensory cortex)
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What are the three pathways of the Anterolateral system?
Spinothalamic, spinoreticular and spinomesencephalic.
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Where do all the pathways of the anterolateral system decussate?
The spinal cord.
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Where is the second synapse of the spinothalamic pathway?
Thalamus.
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Where are the second and third synapses of the spinoreticular pathway?
Second - Pons. Third - Thalamus.
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Where does the spinomesencephalic pathway terminate?
Midbrain (mesencephalon).
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Where do the tracts project to after the thalamus?
Primary somatosensory cortex.
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What is the homunculus?
The representation of the afferent projections to the primary somatosensory cortex.
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Other cards in this set

Card 2

Front

Name the types of endings of proprioceptive and touch receptors.

Back

Paccinian, Merkel and Ruffini.

Card 3

Front

What type of endings do the pain and temperature fibres have?

Back

Preview of the front of card 3

Card 4

Front

Which sensory fibres are myelinated and unmyelinated?

Back

Preview of the front of card 4

Card 5

Front

Where do A alpha and beta fibres terminate?

Back

Preview of the front of card 5
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