L9 - Ascending pathways II

Question 1

general sensation from the face, nose, scalp and dura is carried via which nerve?

Answer 1

trigeminal

CNV

Question 2

general sensation from the ear is carried via which nerve?

Answer 2

facial nerve

CNVII

Question 3

general sensation from the posterior 1/3rd tongue, pharynx and middle ear is carried via which nerve?

Answer 3

glossopharyngeal

CNIX

Question 4

general sensation from the auditory canal, larynx, pharynx and oesophagus is carried via which nerve?

Answer 4

vagus

CNX

Question 5

where does the Trigeminal V1 nerve leave the cranial cavity?

Answer 5

superior orbital fissure

Question 6

where does the Trigeminal V2 nerve leave the cranial cavity?

Answer 6

foramen rotundum

Question 7

where does the Trigeminal V3 nerve leave the cranial cavity?

Answer 7

foramen ovale

Question 8

the Trigeminal sensory nuclei is divided into what 3 parts

Answer 8

1. mesencephalic nucleus
2. pontine/chief sensory nucleus
3. spinal nucleus

Question 9

which Trigeminal sensory nucleus is proprioception processed in?

Answer 9

mesencephalic nucleus

Question 10

which Trigeminal sensory nucleus is discriminative touch processed in?

Answer 10

pointing (chief) sensory nucleus

Question 11

which Trigeminal sensory nucleus is simple touch and pressure processed in?

Answer 11

more rostral parts of the spinal nucleus

Question 12

which Trigeminal sensory nucleus is pain and temperature processed in?

Answer 12

caudal part of spinal nucleus

Question 13

describe the pain and temperature pathway for the head?

Answer 13

1o neuron:
- fibres run caudally in spinal tract of Trigeminal

2o neuron:
synapses with 1o neurone in caudal spinal nucleus - crosses midline and ascends in trigeminothalamic tract to thalamus

Question 14

describe the crude touch and pressure pathway for the head?

Answer 14

1o neuron:
- fibres run caudally in spinal tract of Trigeminal

2o neuron:
synapses with 1o neurone more rostrally in spinal nucleus - crosses midline and ascends in trigeminothalamic tract to thalamus (VPM)

Question 15

with a lesion affecting the lateral medulla, what would the effect be on sensation from the face?

Answer 15

loss of pain / temperature / crude touch on same side of lesion

Question 16

with a lesion affecting the lateral medulla, what would the effect be on sensation from the body?

Answer 16

loss of pain / temperature / crude touch on same side of body

Question 17

fibres carrying pain and temperature from the body will use what pathway?

Answer 17

Spinothalamic pathway

• travel contralaterally in the cord
• cross at level of spinal cord entry

Question 18

fibres carrying pain and temperature from the head will use what pathway?

Answer 18

trigeminothalamic pathway

• Descend through medulla to spinal nucleus
• Cross below entry

Question 19

describe the discriminatory touch pathway for the head?

Answer 19

1o neuron:

• cell bodies in trigeminal ganglion
• synapses with 2o in pointing (chief) nucleus

2o neuron:
axon crosses and ascends in trigeminothalamic tract to thalamus (VPM)

Question 20

describe the proprioception pathway for the head?

Answer 20

1 ⁰ neuron:
- cell
bodies in
Mesencephalic
nucleus*
- synapses with 2o *alongside* mesencephalic nucleus 

2o neuron:
- crosses and ascends to thalamus in trigemini-thalamic tract

Question 21

generally, in pathways of the trigeminal nerve, 1o neuron cell bodies are in the trigeminal ganglion - what is the exception to the rule?

Answer 21

proprioception pathway

1o neuron cell body is in mesencephalic nucleus