4- Toothache Flashcards
General sensory pathways carry information from what?
From different modalities:
Skin, mucus membranes, joints and muscles to the brain
Give an example of pain pathways from toothache and the body?
- The Spinothalamic pathway
2. The Dorsal column pathway
What can we call general sensory pathways?
Somatoesthetic pathways
What are the modalities of the spinothalmic pathway?
- Pain
- Temperature
- Simple touch and some light pressure
Describe what carries the nerve impulses in the spinothalmic pathway
Carried via thin, poorly myelinated or unmyelinated fibres
Conduction relatively slow
What are the modalities of the Dorsal column pathway?
- Discriminative touch
- Pressure
- Vibration
Describe what carries the nerve impulses in the Dorsal column pathway
Carried via large diameter, heavily myelinated fibres
Fast conduction
What is grey matter?
A collection of nerve cell bodies
What is white matter?
Axons with myelin sheaths
What 2 parts make up a Neurone?
Cell body
Axon
What is the grey matter described as in the brain?
As the cortex of the brain
Where is the grey matter found in the spinal cord?
In the inside
Where is the white matter found in the spinal cord?
On the outside
What is a collection of grey matter called inside the central nervous system?
A nuclei or nucleus
What is a collection of grey matter called inside the peripheral nervous system?
A gangli or ganglion
What is the white matter described as in the brain?
A pathway or tract
How many pairs of spinal nerves do we have?
31
How many pairs of cranial nerves do we have?
12
What type of nerves are the spinal nerves?
They are mixed fibre nerves (have both motor and sensory fibres)
What type of nerves are the cranial nerves?
They are mixed fibre nerves (have both motor and sensory fibres)
What are dermatomes?
A specific region of skin of the body innervated by a single spinal nerve
What to dermatomes allow us to do?
Create a sensory map of the body so that if a patient is not feeling sensation is a specific area we know exactly which spinal nerve has been affected
Where is the primary somatosensory cortex located?
In the post central gyrus
What information is received by the primary somatosensory cortex ?
- Pain and temperature sensation
2. Touch sensation