Ascending Sensory Pathways 2

Question 1

What are the three divisions of the trigeminal nerve?

Answer 1

Ophthalmic - V1
Maxillary - V2
Mandibular - V3

Question 2

Which cranial nerve exits via the foramen rotundum

Answer 2

Maxillary branch of trigeminal

Question 3

Which cranial nerve exits via the superior orbital fissure?

Answer 3

Ophthalmic branch of trigeminal

Question 4

Which cranial nerve exits via the foramen oval?

Answer 4

Mandibular branch of trigeminal

Question 5

Where does Herpes Simplex reside in a latent state?

Answer 5

The trigeminal ganglion

Question 6

Where are the cranial nerve nuclei located?

Answer 6

The brainstem

Question 7

Which cranial nerves carry general sensation of the head?

Answer 7

V - Trigeminal
VII - Facial
IX - Glossopharyngeal
X - Vagus

Question 8

What does the information from CN V/VII/IX and X travel in?

Answer 8

Trigeminal Sensory Pathway via the trigeminal nucleus to the thalamus

Question 9

Where do the motor nuclei of trigeminal nerves lie?

Answer 9

Medial to sensory nuclei

Question 10

What are the three segments of the trigeminal nuclei?

Answer 10

Mesencephalic nucleus
Pontine/Chief Sensory nucleus
Spinal nucleus

Question 11

Which parts of the spinal nucleus receives pain and temperature input?

Answer 11

Caudal region

Question 12

Which parts of the spinal nucleus receives simple touch and pressure

Answer 12

Rostral region

Question 13

Where are the primary neutron cell bodies located in the trigeminal pathway?

Answer 13

The trigeminal ganglion

Question 14

What is the key feature of fibres carrying pain, temp, touch and pressure, in the trigeminal pathway?

Answer 14

They descend before they synapse with secondary neurons

Question 15

What are the features of the fibres carrying pain, temp, touch and pressure in the trigeminal pathway?

Answer 15

Thin and slow conducting

Question 16

The descending fibres of the trigeminal pathway in what region of the brainstem?

Answer 16

Descend in the spinal react of the trigeminal nucleus

Superficial on the outer edge of the medulla

Question 17

Where do primary fibres carrying pain, temp, touch and pressure synapse?

Answer 17

primary to secondary: in the spinal nucleus

Secondary to tertiary: in the thalamus

Question 18

Where does the trigeminothalamic tract ascend?

Answer 18

Adjacent to cerebroaqueduct

Question 19

Which pathway, touch and pressure or pain and temperature, descend furthest before synapsing?

Answer 19

Pain and Temperature Pathway

Question 20

Where do the fibres of the touch and pressure pathway synapse to second neurons?

Answer 20

The more rostral region of the spinal nucleus

Question 21

Which nucleus do fibres carrying discriminative touch information travel to?

Answer 21

The pontine / chief sensory nucleus

Question 22

Which nucleus do fibres carrying proprioception information travel to?

Answer 22

Mesencephalic nucleus

Question 23

What is special about the mesencephalic nucleus?

Answer 23

This pathway is an exception to the generalisation that first order cell bodies are in the peripheral ganglia.

Question 24

What are the characteristics of discriminatory touch fibres?

Answer 24

Fat

Fast conduction