Ascending Sensory Pathways

Question 0

What are the 1st order neurons for DCML pathway?

Answer 0

Dorsal root ganglia; Axons ascend as Fasciculus gracilis (LE) and Fasciculus Cuneatus (UE)

Question 1

What does the Dorsal Column Medial Lemniscal Pathway (DCML) carry?

Answer 1

Discriminative tactile sensations from the body

Question 2

What are the 3rd order nuclei for the DCML pathway?

Answer 2

VPL in Thalamus

Question 3

What are the 2nd order nuclei for DCML?

Answer 3

Nucleus Gracilis (LE) and Nucleus cuneatus (UE) Axons ascend as Medial Lemniscus

Question 4

What is the destination for the DCML pathway?

Answer 4

Primary Somatosensory Cortex

Question 5

Where does the DCML pathway decussate?

Answer 5

2nd order axons cross in the Medulla (fibers called internal Arcuate Fobers that represent sensory decussation for discriminative sense)

Question 6

What is the DCML innervated by?

Answer 6

by A-beta afferents that (enter the SC in medial regions of Lissauer’s tract )

Question 7

What does the Trigmenial Lemniscal pathway carry?

Answer 7

Discriminative tactile sensations form the face

Question 8

What is the 1st order neuron for Trigmenial Lemniscal pathway?

Answer 8

Trigmenial ganglion in pons

Question 9

What is the 2nd order neuron for Trigmenial Lemniscal pathway?

Answer 9

Trigmenial main sensory nucleus (axons ascend as Trigmenial Lemniscus)

Question 10

What is the 3rd order neuron for Trigmenial Lemniscal pathway?

Answer 10

VPM in thalamus

Question 11

What is the destination for Trigmenial Lemniscal pathway?

Answer 11

Primary Somatosensory cortex

Question 12

What is the decussation for Trigmenial Lemniscal pathway?

Answer 12

2nd order axons cross in the PONS

Question 13

What is the innervation for Trigmenial Lemniscal pathway?

Answer 13

A-beta afferents

Question 14

What does the Spinothalamic Tract carry?

Answer 14

Pain, thermal sense, and crude touch from body

Question 15

What is the 1st order neuron for the (lateral) Spinothalamic tract?

Answer 15

DRG (A-delta and C afferents)

Question 16

What is the 2nd order neuron for the (lateral) Spinothalamic tract?

Answer 16

Substantia gelantinosa of Rexed’s lamina II

Question 17

What is the 3rd order neuron for the (lateral) Spinothalamic tract?

Answer 17

VPL in Thalamus

Question 18

What is the destination for the (lateral) Spinothalamic tract?

Answer 18

Primary Somatosensory cortex

Question 19

What is the decussation for the (lateral) Spinothalamic tract?

Answer 19

2nd order sensory axons in SC (anterior white commisure) w/in 1-2 levels of entering the SC

Question 20

What do some fibers in the (lateral) Spinothalamic tract terminate as?

Answer 20

Brainstem reticular formation and are called spinoreticular tract fibers

Question 21

What does the Trigeminothalmic tract carry?

Answer 21

carries pain and thermal sense from free nerve endings and heat and cold receptors in the face

Question 22

What is the 1st order neuron for the Trigeminothalmic tract?

Answer 22

Trigeminal ganglion (A-delta and C afferens)

Question 23

What is the 2nd order neuron for the Trigeminothalmic tract?

Answer 23

Spinal nucluds of the trigeminal nerve in the MEDULLA

remember: They descended ipsilaterally when they entered the pons and synapsed on neurons

Question 24

What is the 3st order neuron for the Trigeminothalmic tract?

Answer 24

VPM in the Thalamus

Question 25

What is the destination of the Trigeminothalmic tract?

Answer 25

Primary somatosensory

Question 26

How did the Trigeminothalmic tract descend to get to 2nd order?

Answer 26

Ipsilaterally

Question 27

What does the Dorsal Spinocerebellar tract carry (DSCT)?

Answer 27

Unconscious proprioceptive info from LE (lower)

Question 28

What is the 1st order neuron for Dorsal Spinocerebellar tract (DSCT)?

Answer 28

DRG (group Ia, Ib, II afferens)

Question 29

What is the 2nd order neuron for Dorsal Spinocerebellar tract (DSCT)?

Answer 29

Clarke's column (some alpha neurons directly)

Question 30

What is the 3rd order neuron for Dorsal Spinocerebellar tract (DSCT)?

Answer 30

None terminates in Vermis!

Question 31

What is the destination for Dorsal Spinocerebellar tract (DSCT)?

Answer 31

Cerebellum via Inferior Cerebellar Peduncle

Question 32

What is the decussation neuron for Dorsal Spinocerebellar tract (DSCT)?

Answer 32

NONE

Question 33

What is the information for Dorsal Spinocerebellar tract (DSCT) used for?

Answer 33

Fine coordination of posture and movement of the limb muscles (mostly Lower Extremity)

Question 34

What does the Spinocuneocrebellar tract (SCCT) carry?

Answer 34

Unconscious proprioceptive info from the UE (upper)

Question 35

What are the 1st order neurons for Spinocuneocrebellar tract (SCCT)?

Answer 35

DRG (axons ascend in Fasciculus Cuneatus)

Question 36

What are the 2nd order neurons for Spinocuneocrebellar tract (SCCT)?

Answer 36

Nucleus cuneatus

Question 37

What are the 3rd order neurons for Spinocuneocrebellar tract (SCCT)?

Answer 37

NONE

Question 38

What is the destination for Spinocuneocrebellar tract (SCCT)?

Answer 38

Cerebellum (Inferior Peduncle)

Question 39

What is the information for Spinocuneocrebellar tract (SCCT) used for?

Answer 39

In Fine coordination of posture and movement of UE (upper)

Question 40

What does the Ventral(Anterior) Spinocerebellar tract (VSCT) carry?

Answer 40

Info about descending motor signals to THORAX and LUMBAR of SC

Question 41

What are the 1st order neurons for Ventral Spinocerebellular tract (VSCT)?

Answer 41

Rexed Lamina 5, 6, and 7 of thorax and lumbar SC; axons ascend in Lateral Funiculus

Question 42

What are the 2nd order neurons for Ventral Spinocerebellular tract (VSCT)?

Answer 42

NONE

Question 43

What are the 3rd order neurons for Ventral Spinocerebellular tract (VSCT)?

Answer 43

NONE

Question 44

What is the destination for Ventral Spinocerebellular tract (VSCT)?

Answer 44

Bilaterally to Cerebellum via Superior Peduncle

Question 45

What is the decussation for Ventral Spinocerebellular tract (VSCT)?

Answer 45

1st order axons in SC (anterior white commissure)

Question 46

What happens to the Ventral Spinocerebellular (VSCT) fibers?

Answer 46

Most fibers cross again the cerebellum and are ipsilateral to the stimulus *(Some can remain contralateral from the side of stimulus)

Question 47

What does the Rostral Spinocerebellular tract (RSCT) carry?

Answer 47

info about descending motor signals to cervical SC

Question 48

What are the 1st order neurons for Rostral Spinocerebellular tract (RSCT)?

Answer 48

Rexed Lamina 5, 6, and 7 of cervical SC

Question 49

What is the destination for Rostral Spinocerebellular tract (RSCT)?

Answer 49

Cerebellum (via Superior and Inferior Peduncle)

Question 50

Lesion on the Periphery region for DCML will cause?

Answer 50

Ipsilateral loss

Question 51

Lesion on the Spinal region for DCML will cause?

Answer 51

ipsilateral loss

Question 52

Lesion on the Medulla region for DCML will cause?

Answer 52

Contralateral loss (lower medulla)

Question 53

Lesion on the Cerebrum, Midbrain, and pons regions for DCML will cause?

Answer 53

Entire contralateral loss

Question 54

Lesion on the Periphery region for Spinothalamic Tract will cause?

Answer 54

ipsilateral loss

Question 55

Lesion on the Spinal region for Spinothalamic Tract will cause?

Answer 55

Contralateral loss

Question 56

Lesion on the Medulla region for Spinothalamic Tract will cause?

Answer 56

Mixed hemianesthesia (upper medulla/ lower pons)

Question 57

Lesion on the Cerebrum, Midbrain, and Pons regions for Spinothalamic Tract will cause?

Answer 57

Entire contralateral loss