13_Somatosensory_Essential Pathway Differences

Question 1

Where are the cell bodies of the…

DC-ML and ALS?

Answer 1

Dorsal Root Ganglion

Question 2

Where are the cell bodies of the…
Trigeminal Mechanosensory?
Spinal Trigeminal System?

Answer 2

Trigeminal Ganglion

Question 3

Where are the cell bodies of the…
Dorsal Spinalcerebellar Tract?
Cuneocerebellar Tract?

Answer 3

Dorsal Root Ganglion

Question 4

Where are the 1st order tracts of the DC-ML?

Answer 4

Ascends ispilaterally in Dorsal Column Upper body (above T6) = Cuneate Lower body (below T6) = Gracile

Question 5

Where are the synapses of the DC-ML?

Answer 5

Dorsal Column Nuclei (Gracile or Cuneate Nucleus)

Question 6

Where is the decussation for the DC-ML?

Answer 6

Internal Arcuate Fibers in the Caudal Medulla

Question 7

Where is the second order tract of the DC-ML?

Answer 7

Medial Lemniscus

Question 8

Where are the 1st order tracts of the ALS?

Answer 8

Enters through dorsal root, bifurcates to ascending and descending branches into Dorsolateral Tract of Lissauer before entering dorsal horn

Question 9

Where are the synapses of the ALS?

Answer 9

Dorsal Horn (Lamina I, IV and V

Question 10

Where is the decussation for the ALS?

Answer 10

Anterior/Ventral White Commissure (Spinal Cord)

Question 11

Where are the second order tracts of the ALS?

Answer 11

Anterolateral System/ Spinalthalamic Tract (STT)

Question 12

Where are the first order tracts of the Trigeminal Mechanosensory system?

Answer 12

Enter pons directly from the trigeminal ganglion

Question 13

Where is the synapse of the Trigeminal Mechanosensory system?

Answer 13

Principle Nucleus of the trigeminal complex

Question 14

Where is the decussation of the Trigeminal Mechanosensory system?

Answer 14

Pons

Question 15

Where is the second order tract of the trigeminal mechanosensory system?

Answer 15

Medial Lemniscus (trigeminal tract)

Question 16

Where is the first order tract of the Spinal Trigeminal System?

Answer 16

Enter pons and descend in spinal trigeminal tract to levels in medulla to cervical spian cord

Question 17

Where is the synapse of the of the Spinal Trigeminal System?

Answer 17

Spinal Nucleus (Trigeminal Complex)

Question 18

Where is the decussation of the Spinal Trigeminal Tract?

Answer 18

Medulla to Cervical Spinal Cord

Question 19

Where is the second order tract of the Spinal Trigeminal Tract?

Answer 19

Medial Leminscus (trigeminothalamic tract)

Question 20

Where is the 2nd order to 3rd order synapse of the…
DC-ML and ALS?
Trigeminal Mechanosensory?

Answer 20

• Ventral Posterior Lateral (VPL) Nucleus of Thalamus

* VPM Nucleus of Thalamus

Question 21

Where are the first order tracts of the

1) DC-ML?
2) Trigeminal Mechanosensory?
3) ALS
4) Spinal Trigeminal System?

Answer 21

1) Ascends ispilaterally in Dorsal Column Upper body (above T6) = Cuneate Lower body (below T6) = Gracile
2) Enters pons directly from trigeminal ganglion
3) Enters through dorsal root, bifurcates to ascending and descending branches into Dorsolateral Tract of Lissauer before entering dorsal horn
4) Enter pons and descend in spinal trigeminal tract to levels in medulla to cervical spian cord

Question 22

Where are the synapses of the

1) DC-ML?
2) Trigeminal Mechanosensory?
3) ALS
4) Spinal Trigeminal System?

Answer 22

1) Dorsal Column Nuclei (Gracile or Cuneate Nucleus)
2) Principal Nucleus (Trigeminal Complex)
3) Dorsal Horn (Lamina I, IV and V)
4) Spinal Nucleus (Trigeminal Complex)

Question 23

Where are the decussations of the

1) DC-ML?
2) Trigeminal Mechanosensory?
3) ALS
4) Spinal Trigeminal System?

Answer 23

1) Internal Arcuate Fibers (Caudal Medulla)
2) Pons
3) Anterior/Ventral White Commissure (Spinal Cord)
4) Medulla to Cervical Spinal Cord

Question 24

Where are the second order tracts of the

2) Trigeminal Mechanosensory?
3) ALS
4) Spinal Trigeminal System?

Answer 24

1) Medial Lemniscus
2) Medial Leminiscus trigeminothalamic tract)
3) Anterolateral System/ Spinalthalamic Tract (STT)
4) Medial Leminiscus (trigeminothalamic tract)

Question 25

Where are the tracts for the

Dorsal Spinocerebellar Tract (DSCT)? Cuneocerebellar Tract (CCT)?

Answer 25

1) Enters dorsal horn at spinal cord (thoracic, lumbar, sacral)
2) Enters dorsal horn at spinal cord (cervical)

Question 26

Where are the synapses for the

Dorsal Spinocerebellar Tract (DSCT)? Cuneocerebellar Tract (CCT)?

Answer 26

1) Clark’s Nucleus (Lower Spinal Cord)

2) External Cuneate Nucleus (Medulla)

Question 27

Where are the second order tracts of the

Dorsal Spinocerebellar Tract (DSCT)? Cuneocerebellar Tract (CCT)?

Answer 27

Dorsal Spinocerebellar

Cuneocerebellar

Question 28

Where is the destination for the

Dorsal Spinocerebellar Tract (DSCT)? Cuneocerebellar Tract (CCT)?

Answer 28

Cerebellum

There are no third order tracts