Touch of (V)

Question 1

Touch as affiliated with what types of sensation?

Answer 1

Discriminative, and light-non discriminative

Question 2

Where are the cell bodies of the 1st order neuron for discriminative touch as well as light touch located?

Answer 2

In the Trigeminal Ganglion

Question 3

Where are the cell bodies of the 2nd order neuron located?

Answer 3

Main Sensory nucleus

Question 4

The Main Sensory nucleus is conserned with what? Over where?

Answer 4

Two point-discrimination over the entire distribution of the Trigeminal nerve

Question 5

The majority of the axons leaving the main sensory nucleus cross the midline and ascend where?

Answer 5

In the Ventral Trigeminothalamic Tract (VTT)

Question 6

The majority of the axons leaving the Main sensory nucleus cross the midline and ascend in the Ventral Trigeminothalamic Tract (VTT), However what is the extra pathway called that they can travel on if they do not cross?

Answer 6

Dorsal Trigeminal Thalamic Tract (DTT)

Question 7

The Dorsal Trigeminal Thalamic Tract (DTT) travels which way from the main sensory nucleus?

Answer 7

Ascends Ipsilaterally

Question 8

Regardless of whether touch senses travel on the VTT or DTT 2nd order axons ascend to end where?

Answer 8

In the Ventral posteromedial thalamic nucleus

Question 9

Cell bodies of the third order neurons are located where?

Answer 9

Ventral Posteromeidal thalamic nucleus (VPM)

Question 10

Axons leaving the Ventral Posteromeidal thalamic nucleus (VPM) ascend where?

Answer 10

In the Posterior limb of the internal capsule (superior thalamic radiations)

Question 11

Axons ascending in the Posterior limb of the internal capsule (superior thalamic radiations) synapse where?

Answer 11

In the Primary somatosensory cortex