Flashcards in Ascending Sensory pathways 2 Deck (68)
What are somaesthetic pathways?
perception of bodily senses such as
Where are somaesthetic pathways?
in face and body
What number cranial nerve is the trigeminal nerve?
What are the 3 divisions of the trigeminal nerve?
1. opthalmic nerve - V1
2. Maxillary nerve - V2
3. Mandibular nerve - V3
Where does the opthalmic division of the trigeminal nerve run in the skull?
superior orbital fissure
Where does the maxillary division of the trigeminal nerve run in the skull?
Where does the mandibular division run in the skull?
What branch of V2 (maxillary nerve) supplies the upper teeth?
Superior alveolar nerve
What branch of V3 (mandibular nerve) supplies the lower teeth?
Inferior alveolar nerve
What is herpes zoster (shingles)?
infection of the sensory roots of trigeminal nerve
How does herpes zoster (shingles) spread/infect?
Along the dermatome - if it affects V2 the maxilla will have a group of shingles blisters on their face along the maxilla
What 2 groups do the somaesthetic modalities fall into?
1. modalities that are essential for survival - pain, temp, some touch and pressure
2. modalities that increase detail - discriminative touch and proprioception
What is meant by discriminative touch?
2 point discrimination
How many neurones are involved in the chain from receptor to sensory cortex?
3 neuron chains
How do the first order neurones travel?
from PNS to CNS
Where are first order neurons found?
cell bodies in the peripheral ganglia
How do the second order neurons travel?
Where are the second order neurone found?
extend to thalamus
How do third neurones travel?
extend from the thalamus to the post-central gyrus
Where are cranial nerve nuclei located?
they are very specific
Where does sensory information received in cranial nerve nuclei come from?
fibres entering brainstem n cranial nerves?
What does the cranial nerve nuclei also give rise to that leave the brainstem in cranial nerves?
What is the cranial nerve nuclei equivalent to?
dorsal grey horn in spinal cord
- collection of cell bodies
- where primary sensory neurons synapse withs secondary sensory neurons
What is the motor nucleus equivalent to?
ventral grey horn
What does the trigeminal central nucleus deal with?
fibres coming from trigeminal nerve
Which cranial nerves is general sensation from the head carried by?
CN V, VII, IX, X
Which cranial nerve is the major carrier of general sensory info from FACE, NOSE, SCALP and DURA?
Which cranial nerve carries sensation for the external ear?
Which cranial nerve carries sensation from the posterior 1/3 of the tongue, pharynx and middle ear?