Neuroanatomy - Toothache Flashcards
Describe the spinothalamic pathway and trigeminothalamic pathway in terms of:
- Modalities
- What it is carried by
- Conduction speed
- Pain, temperature, simple touch and some pressure
- Thin, poorly myelinated and unmyelinated fibres
- Conduction is relatively slow
The ganglia contain grey matter. What does the grey matter contain
Contains cell bodies
The white matter contains nerves. What else does the white matter contain
Contains neurons
Describe the pseudo-unipolar neurons
- Neurons relay signals from the skin and muscles to the spinal chords
- They’re primary neurons responsible for coordinating movement of the arms and legs using input from the brain
Describe the bipolar neurons
Send signals and receive information from the world
Describe the multipolar neurons
- Neurons are able to receive impulses from multiple neurons via dendrites
- Dendrites transmit signals through the neuron via an electrical signal that is spread down the axonD
Describe first order neurons
- From CNS to PNS
- Cell bodies in peripheral ganglia
- Pseudounipolar
Describe second order neurons
- Cell bodies in CNS
- Axons cross midline
- Run to thalamus
Describe third order neurons
Run from thalamus to cerebral cortex - primary somatosensory area
Whats a dermatome
A specific region of skin of the body innervated by the sensory fibres of a single segmental spinal nerve
What areas are not classed as dermatomes
- Areas of the face supplied by a single cranial nerve
- Can be mapped
What does the dorsal root ganglion contain
- Cell bodies of the sensory neurons of the first order neurons
- As the fibre makes it way into the dorsal grey horn, it synapses with the 2nd order neuron
- Axon of 2nd order neuron crosses the midline + enters the spinothalamic tract
Which branches of the trigeminal nerve innervate the teeth
V2 Maxillary nerve:
- Gives rise to the posterior superior alveolar nerve, infraorbital nerve and the anterior superior alveolar nerve
V3 Mandibular nerve:
- Gives rise to the inferior alveolar nerve
Where does the V2 Maxillary nerve and the V3 mandibular nerve originate at
The trigeminal ganglion - comes from the pons region in the midbrain
What are the 3 branches of the trigeminal ganglion?
Where do the branches exit the cranium through
- V1: Ophthalmic region - Superior Orbital Fissure
- V2: Maxillary division - Foramen Rotundum
- V3: Mandibular division - Foramen Ovale
