Ascending Sensory Pathways II

Question 1

Branches of trigeminal nerve

Answer 1

V1 - ophthalmic
V2 - maxillary
V3 - mandibular

Question 2

Ophthalmic exit

Answer 2

Superior orbital fissure

Question 3

Maxillary exit

Answer 3

Foramen rotundum

Question 4

Mandibular exit

Answer 4

Foramen ovale

Question 5

V2 supplies which teeth

Answer 5

Upper teeth (inf. alveolar nerve)

Question 6

V3 supplies which teeth

Answer 6

Lower teeth (inf. alveolar nerve)

Question 7

Where does herpes zoster virus lie dormant?

Answer 7

Sensory roots of specific spinal nerves

Question 8

So which two groups of somaesthetic are there

Answer 8

Essential to survival - pain, temp, some touch and pressure

Detail - discriminative touch, vibration, proprioception

Question 9

Cranial nerve nucleus is equivalent to what in PNS

Answer 9

DRG

Question 10

which four cranial nerves are associated with general sensation of head

Answer 10

V
VII
IX
X - conscious sensation

Most is trigeminal (5)

All through trigeminal sensory

Question 11

Trigeminal supplies what in face

Answer 11

Major carrier of general sensory - face, nose, scalp, dura

Question 12

Facial supplies what in face

Answer 12

External ear

Question 13

Glossopharyngeal supplies what in face

Answer 13

Post 1/3rd tongue
Pharynx
Middle ear

Question 14

Vagus supplies what in face

Answer 14

Auditory canal
Larynx
Pharynx
Oesophagus

Question 15

Trigeminal nucleus is continous with…

Answer 15

Continuous with mesencephalic nucleus, pontine, spinal nucleus of trigeminal nucleus

Question 16

Trigeminal nucleus contains which fibres of which cranial nerves

Answer 16

Sensory fibres of

Trigeminal
Facial
Glossopharyngeal
Vagus

Question 17

Where do the fibres from the trigeminal nucleus go to

Answer 17

The thalamus

Question 18

Which branch off facial nerve carries taste

Answer 18

Solitary tract branch

Question 19

Where does the motor nucleus lie relative to chief sensory nucleus

Answer 19

Medial

Question 20

Which part of sensory nucleus receives pain and temperature

Answer 20

Caudal part of spinal nucleus

Question 21

Which part of sensory nucleus receives simple touch and pressure

Answer 21

More rostral parts of spinal nucleus

Question 22

first order neuron cells bodies are in what ganglion

Answer 22

trigeminal ganglion

Question 23

where is the trigeminal ganglion

Answer 23

sits just next to the foramina which the three branches of the trigeminal pass through

Question 24

what type of fibres are running through the trigeminal ganglion

Answer 24

Thin, slow fibres

Question 25

where do the fibres of each respective cranial nerve enter the brain stem

Answer 25

where they normally would based on the cranial nerve in question

Question 26

what do the fibres do when they enter the brain stem

Answer 26

They descend in the spinal tract of the trigeminal adjacent to the nucleus.

When it gets to the bottom it jumps in

Question 27

What does it do in the nucleus

Answer 27

Synapses ipsilaterally into the secondary neuron

Question 28

What does the secondary neuron do

Answer 28

Cross the midline to the thalamus via the trigeminothalamic tract

Question 29

Where do these descending fibres run in terms of depth on the brain stem

Answer 29

They’re superficial - outer edge of medulla

Question 30

trigeminalthalamic tract runs where in terms of depth

Answer 30

Deep in the medulla, pons and midbrain - small diameter

Question 31

What info does the left trigeminothalamic tract carry

Answer 31

Right side information

Question 32

What info does the right spinal tract carry

Answer 32

info from RHS

Question 33

at medulla on right hand side if there is a lesion what damage is caused

Answer 33

right hand face

left hand body

Question 34

which artery runs anterior to the medulla and what could happen

Answer 34

ant. inf. cerebellar artery

aneurysm could cause ipsilateral side of face deficit and contralateral body

Question 35

discriminative touch fibre goes into which nucleus

what is the fibre like

Answer 35

Pontine nucleus

Fat, fast, myelinated

Question 36

proprioception fibre goes into which nucleus

Answer 36

Mesencephalic nucleus

Question 37

if you are a proprioceptive fibre your cell body does not sit in the trigeminal ganglion you sit in

Answer 37

mesencephalic nucleus

Question 38

Proprioceptive pathway primary neuron synapses where

Answer 38

mesencephalic nucleus

Question 39

proprioceptive pathway primary neuron runs with which nerve

Answer 39

in mandibular division of trigeminal

Question 40

where does the secondary neuron of proprioceptive pathway synapse

Answer 40

medial to mesencephalic nucleus

Question 41

why is this different?

Answer 41

for proprioception of mouth

Question 42

jaw jerk reflex - fibres go to where

Answer 42

motor neurons in trigeminal motor nucleus - just one synapse