Medical Neuroscience Somatosensation Of The Face

Front 1

What are the three types of sensory pathways associated with the orofacial area?

Back 1

-fine touch and vibration
-pain ad temperature
-proprioception

Front 2

What pathway/nerve is associated with somatosensation to the orofacial region?

Back 2

trigeminal pathway

Front 3

What is the 1st order neuron in the Orofacial fine touch and vibration pathway, where is its soma and where does it synapse?

Back 3

-1st neuron is the primary sensory neuron
-Cell body is in the trigeminal ganglion
-projects to the pons and synapses in the chief sensory nucleus on the ipsilateral side

Front 4

What is the 2nd order neuron in the Orofacial fine touch and vibration pathway, where is its soma and where does it synapse?

Back 4

-soma is in the cheif sensory nucleus
-projects through the brainstem and synapses bilaterally in the vental posterior medial thalamic nucleus (VPM)

Front 5

What is the 3rd order neuron in the Orofacial fine touch and vibration pathway, where is its soma and where does it synapse?

Back 5

-soma in the VPM
-projects to the primary somatosensory cortex via the PLIC

Front 6

Where is the 1st neuron in the orofacial pain and temperature pathway, and where does it project to?

Back 6

-soma is in the trigeminal ganglion
-projects into brainstem
-synapses in the spinal trigeminal nucleus on the ipsilateral side

Front 7

Where is the 2nd neuron in the orofacial pain and temperature pathway, and where does it project to?

Back 7

-soma in the spinal trigeminal nucleus
-projects to contralateral side of the brainstem and ascends in the ventral trigeminal tract
-synapses in the VPM

Front 8

Where is the 3rd neuron in the orofacial pain and temperature pathway, and where does it project to?

Back 8

-soma in the VPM
-projects through PLIC
-synpses in the primary somatosensory cortex

Front 9

Where is the soma for the 1st neuron in the orofacial proprioceptive pathway located, and where does it project to?

Back 9

-soma in the mesencephalic nucleus in the brainstem
-recieves sensory input from ipsilateral side via trigeminal nerve
-project bilaterally to the trigeminal motor nucleus to synapse

Front 10

Where does the 2nd neuron in the orofacial proprioceptive pathway project to?

Back 10

-project from the trigeminal motor nucleus, out V3 branch of the trigeminal ganglion
-innervate the muscles of mastication

Front 11

What is the corneal reflex?

Back 11

When the cornea is touched, will blink bilaterally

Front 12

Describe the pathway of the corneal reflex.

Back 12

-CN V brings sensory onfo from the cornea via neuron with soma in the trigeminal ganglion, to the Spinal Trigeminal Nucleus
--info travels to the reticular foramtion where synapses
-axons from reticular formation project bilaterally to the facial motor nucleus
-CN VII projects to the orbicularis occuli muscles and causes blink

Front 13

What is the rericular formation?

Back 13

It is a collection of cell bodies and axons that have different functions, and are spread out in a net of neurons, gets input about sound, light and sensation