sensory pathways 2

Question 1

What are the three divisions of the trigeminal nerve?

Answer 1

ophthalmic, maxillary, mandibular

Question 2

Which foramen does the ophthalmic nerve pass through?

Answer 2

superior orbital fissure

Question 3

Which foramen does the maxillary nerve pass through?

Answer 3

foramen rotundum

Question 4

Which foramen does the mandibular nerve pass through?

Answer 4

foramen ovale

Question 5

sensation from head is carried in which cranial nerves?

Answer 5

V, VII, IX, X

Question 6

What sensations does the vagus nerve carry?

Answer 6

Sensory information from auditory canal, larynx, pharynx, oesophagus

Question 7

What sensations does the glossopharyngeal nerve carry?

Answer 7

posterior third of tongue, pharynx, middle ear

Question 8

From where does the facial nerve carry sensory fibres?

Answer 8

external ear

Question 9

In which central pathway do the sensory fibres of CN V, VII, IX and X run?

Answer 9

trigeminal sensory pathway

Question 10

Where is the principal trigeminal nucleus located?

Answer 10

in the pons

Question 11

Where is the spinal nucleus of trigeminal nerve located?

Answer 11

medulla

Question 12

Where is the mesencephalic nucleus of trigeminal nerve located?

Answer 12

midbrain

Question 13

What are the 3 nuclei of the trigeminal sensory pathway?

Answer 13

mesencephalic, principal and spinal

Question 14

Which part of spinal nucleus do pain and temperature fibres run to?

Answer 14

fibres descend in spinal tract to caudal part of spinal nucleus, synapses with secondary neuron.

Question 15

Which part of spinal nucleus do simple touch and pressure fibres run to?

Answer 15

fibres descend in spinal tract to rostral part of spinal nucleus, synapses with secondary neuron

Question 16

Where do the secondary neurons of pain and temperature fibres ascend from spinal nucleus?

Answer 16

cross midline, ascend in contralateral trigeminothalamic tract to VPM in thalamus

Question 17

Where do the secondary neurons of touch and pressure fibres ascend from spinal nucleus?

Answer 17

cross midline, ascend in contralateral trigeminothalamic tract to VPM in thalamus

Question 18

Into which trigeminal nucleus do discriminative touch fibres run?

Answer 18

pontine/ principal/ chief

Question 19

Into which trigeminal nucleus do proprioception fibres run?

Answer 19

mesencephalic nucleus

Question 20

where are the cell bodies of primary neurons of the proprioception pathway (mostly fibres of mandibular division of V) located?

Answer 20

in the peripheral ganglia not in the mesencephalic nucleus

Question 21

Where do proprioception fibres synapse?

Answer 21

some just outside mesencephalic nucleus and those for jaw jerk reflex in the trigeminal motor nucleus.