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Flashcards in Ascending Sensory pathways 2 Deck (68)
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1

What are somaesthetic pathways?

perception of bodily senses such as

- pain
- temperature
- touch
- position

2

Where are somaesthetic pathways?

in face and body

3

What number cranial nerve is the trigeminal nerve?

CN V

4

What are the 3 divisions of the trigeminal nerve?

1. opthalmic nerve - V1
2. Maxillary nerve - V2
3. Mandibular nerve - V3

5

Where does the opthalmic division of the trigeminal nerve run in the skull?

superior orbital fissure

6

Where does the maxillary division of the trigeminal nerve run in the skull?

foramen rotundum

7

Where does the mandibular division run in the skull?

foramen ovale

8

What branch of V2 (maxillary nerve) supplies the upper teeth?

Superior alveolar nerve

9

What branch of V3 (mandibular nerve) supplies the lower teeth?

Inferior alveolar nerve

10

What is herpes zoster (shingles)?

infection of the sensory roots of trigeminal nerve

11

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

12

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

13

What is meant by discriminative touch?

2 point discrimination

Vibration

14

How many neurones are involved in the chain from receptor to sensory cortex?

3 neuron chains

15

How do the first order neurones travel?

from PNS to CNS

16

Where are first order neurons found?

cell bodies in the peripheral ganglia

17

How do the second order neurons travel?

across midline

18

Where are the second order neurone found?

extend to thalamus

19

How do third neurones travel?

extend from the thalamus to the post-central gyrus

20

Where are cranial nerve nuclei located?

brainstem

they are very specific

21

Where does sensory information received in cranial nerve nuclei come from?

fibres entering brainstem n cranial nerves?

22

What does the cranial nerve nuclei also give rise to that leave the brainstem in cranial nerves?

motor fibres

23

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

24

What is the motor nucleus equivalent to?

ventral grey horn

25

What does the trigeminal central nucleus deal with?

fibres coming from trigeminal nerve

26

Which cranial nerves is general sensation from the head carried by?

CN V, VII, IX, X

27

Which cranial nerve is the major carrier of general sensory info from FACE, NOSE, SCALP and DURA?

trigeminal CNV

28

Which cranial nerve carries sensation for the external ear?

Facial CNVII

29

Which cranial nerve carries sensation from the posterior 1/3 of the tongue, pharynx and middle ear?

Glossopharyngeal CNVIX

30

Which cranial nerve carries sensation from auditory canal, larynx, pharynx and oesophagus?

Vagus CN X