Trigeminal Sensory Pathways

Question 1

What are the 2 nervous systems?

Answer 1

▪ Central Nervous System (CNS)

– Brain

– Spinal Cord

▪ Peripheral Nervous system (PNS)

– Spinal nerves

– Cranial nerves

Question 2

Label the diagram, in particular where V sensory/motor roots and IVth Ventricle are..

Answer 2

Question 3

Label this diagram and draw the direction where the Trigeminal spinal tract would go…

Answer 3

Question 4

What is Nucleus Caudalis the site for?

Answer 4

Nucleus Caudalis is the site for synapses for pain, hot and cold

Question 5

What happens when there is damage to main sensory Nucleus (MSN)?

Answer 5

Damage to MSN:

– ipsilateral loss of touch to face

– still feel pain, hot or cold

Question 6

What is Trigeminal Mesencephalic Nucleus (Vmes)

Answer 6

• Contain cell bodies for jaw muscle spindle afferents
• Primary afferent cell bodies within the central nervous system
• Nerves synapse in the V motor nucleus

Question 7

Where is the Trigeminal Motor Nucleus

Answer 7

Medial to the MSN in the Pons

Question 8

Where does the Trigeminal Motor Nucleus efferents exit?

Answer 8

Exit via motor root to mandibular division to supply muscles of mastication.