pain associated with the head Flashcards
what is orofacial pain?
pain arising in the mouth, jaw and face
what are the painful conditions of the trigeminal system?
- Trigeminal Neuralgia
- Headache
- Migraine
- Temporomandibular disorders
- Myofascial pain
- Dental pain
what is the effect of injury to the brain?
-causes an altered brain function rather than pain itself
what do the 1st order neurones in the trigeminal system do?
-they travel from the face to the pars interpolaris and pars caudalis of the medulla/upper cervical cord
what do the 2nd order neurones in the trigeminal system do?
ascend contralaterally to the thalamus via the trigemino-thalamic tract
what do the 3rd order neurones in the trigeminal system do?
project to the cortex
what do 1st 2nd and 3rd order neurones (aka the 5th cranial nerves) innervate?
specialised structures i.e.
-tooth pulp
what are the 6 causes of headaches?
- Traction or dilatation of intracranial or extracranial arteries.
- Traction of large extracranial veins
- Compression, traction or inflammation of cranial and spinal nerves
- Spasm and trauma to cranial and cervical muscles.
- Meningeal irritation and raised intracranial pressure
- Disturbance of intracerebral serotonergic projection
what is the role of serotonin?
- it is a neurotransmitter for transmitting pain signals.
- unstable transmission lowers the threshold of the migraine
there are 7 classes of serotonin (5-HT) receptors. How many of these are involved in migraine pain?
2
during a migraine are serotonin levels high or low in the blood?
low due to low blood pH
what is sinus pain?
pain behind the forehead and cheekbones
what is cluster pain?
pain in and around one eye
what is tension pain?
pain like a band squeezing the top of the head
what is migraine pain?
pain, nausea and visual changes