Spinal Cord Pathways

Question 1

Lateral Spinothalamic Tract (LSTT)

Answer 1

PAIN and TEMPERATURE
primary neuron - enters through dorsal root and synapses in dorsal horn
secondary neuron - cross in the anterior white commissure and ascend as spinal lemiscus
tertiary neuron - start in VPL and go to primary somesthetic cortex

Question 2

Ventral Spinothalamic Tact (VSTT)

Answer 2

LIGHT TOUCH and CRUDE TACTILE

Question 3

Spinoreticularthalamic Tract (SRTT)

Answer 3

SLOW and VISCERAL PAIN
primary neuron - C type pain fibers to nucleus proprius
secondary neuron - nuclues proprius to fasciculus proprius to ascend as spinoreticular fibers
tertiary neuron - VPL to primary somesthetic cortex

Question 4

Dorsal Spinocerebellar Tract (DSCT)

Answer 4

unconscious, precise, proprioceptive info from inferior 1/2 of the body and lower extremities to cerebellum

Question 5

Ventral Spinocerebellar Tract (VSCT)

Answer 5

unconscious, general, proprioceptive info from lumbosacral region to cerebellum
DECUSSATES in anterior white commissure

Question 6

Lateral Corticospinal Tract (LCST)

Answer 6

primary neurons - start in primary motor cortexand DECUSSATE at pyramidal decussation in the medulla to form LCST
secondary neuron - CB in anterior horn and inn a skeletal mm

Question 7

Anterior Corticospinal Tract (ACST)

Answer 7

fibers of the LCST that did not cross in the pyramidal decussation

Question 8

Lateral Reticulospinal Tract (LRST)

Answer 8

originates in medial pontine nuclei

PRINCIPLE DESCENDING PATHWAY FOR AUTONOMIC RESPONSES

Question 9

Posterior Column/Medial Lemiscus System

Answer 9

PROPRIOCEPTION, 2 POINT TACTILE
primary neuron - enters dorsal root and goes to posterior column and ascends to medulla
secondary neuron - DECCUSATES and ascends and medullary lemiscus
tertiary nucleus - VPL to primary somesthetic cortex