Pathways

Question 1

Is the Lemniscal tract motor or sensory?

Answer 1

-Epicritic sensory

Question 2

Is the Lemniscal tract conscious or unconscious?

Answer 2

-Conscious

Question 3

Where does the Lemniscal tract begin?

Answer 3

-Dorsal root axons in the spinal cord which enter and rise through the gracile and cuneate fasciculi

Question 4

Where does the Lemniscal tract end?

Answer 4

• The fasciculi synapse in the medulla at the gracile and cuneate nuclei
• They then cross at the internal arcuate fibers, and become the medial lemniscus.
• The medial lemniscus ascends to the thalamus.

Question 5

Does the Lemniscal tract cross, and if so, where?

Answer 5

-Yes, at the internal arcuate fibers in the medulla.

Question 6

What makes up the anterolateral tract?

Answer 6

• Spinothalamic tract
• Spinoreticular tract
• Spinomesencephalic tract

Question 7

Where does the spinothalamic tract begin?

Answer 7

-Dorsal root axons that synapse immediately at the dorsal horn of the spinal level that they enter at

Question 8

Where does the spinothalamic tract end?

Answer 8

-After ascending via the anterolateral tract, it terminates at the thalamus on several nuclei (espec. posterior and VPL)

Question 9

Does the spinothalamic tract cross? If so, where?

Answer 9

-Yes, the majority of neurons cross at the spinal level which they enter.

Question 10

Is the spinothalamic tract motor or sensory?

Answer 10

-Both conscious and unconscious protopathic sensory from trunk and limbs.

Question 11

Is the spinoreticular tract motor or sensory?

Answer 11

-Protopathic sensory from the trunk and limbs

Question 12

Where does the spinoreticular tract begin?

Answer 12

-Dorsal root axons that synapse immediately at the dorsal horn of the spinal level they enter at.

Question 13

Where does the spinoreticular tract end?

Answer 13

-After ascending via the anterolateral tract, it terminates at the reticular formation

Question 14

Does the spinoreticular tract cross? If so, where?

Answer 14

-Yes, neurons cross at the spinal level they enter at

Question 15

Is the spinomesencephalic tract motor or sensory?

Answer 15

-Protopathic sensory from the trunk and limbs

Question 16

Where does the spinomesencephalic tract start?

Answer 16

-Dorsal root axons of the spinal level at which they enter

Question 17

Where does the spinomesencephalic tract end?

Answer 17

-After ascending via the anterolateral tract, neurons synapse at the periaqueducatal gray area of the midbrain and superior colliculus.

Question 18

Does the spinomesencephalic tract cross, and if so, where?

Answer 18

-Yes, neurons cross immediately at the spinal level they enter at.

Question 19

Is the spinocerebellar tract motor or sensory?

Answer 19

-Sensory regarding position, force production, and movement of limbs

Question 20

Where does the spinocerebellar tract begin?

Answer 20

• Axons from the lower limb and trunk which ascend from the gracile fasiculus to the nucleus of clark in the thoracic cord.
• Axons from the upper limb and trunk which ascends via the cuneate fascicles to the lateral cuneate nucleus.

Question 21

Where does the spinocerebellar tract end?

Answer 21

-the cerebellum as either the dorsal spina-cerebellar tract (lower limb and trunk) or the cuneo-cerebellar tract (upper limb and trunk.)

Question 22

Does the spinocerebellar tract cross, and if so, where?

Answer 22

-No

Question 23

What are the components of the pyramidal system?

Answer 23

• Cortico-bulbar
• Cortico-pontine
• Cortico-spinal

Question 24

Does the corticobulbar tract carry motor or sensory info?

Answer 24

-Motor to the head and neck

Question 25

Where does the corticobulbar tract begin?

Answer 25

-The lobes of the neocortex, primarily frontal and parietal lobes

Question 26

Where does the corticobulbar tract end?

Answer 26

-Cranial nerve nuclei in the brainstem (11 most caudal)

Question 27

Does the corticobulbar tract cross, and if so, where?

Answer 27

-Tract does not cross

Question 28

Does the corticopontine tract cary sensory info or motor info?

Answer 28

-Motor to cerebellum (how the cerebellum gets the plan)

Question 29

Where does the corticopointine tract start?

Answer 29

-Cortex, primarily frontal and parietal lobes

Question 30

Where does the corticopontine tract end?

Answer 30

-Pontine nuclei/Cerebellum

Question 31

Does the corticopontine tract cross, and if so, where?

Answer 31

-Yes, after the synapse at the pontine nuclei

Question 32

Does the corticospinal tract carry motor or sensory info?

Answer 32

-Motor

Question 33

Where does the corticospinal tract begin?

Answer 33

-Cortex (frontal and parietal, specifically the motor and premotor areas)

Question 34

Where does the corticospinal tract end?

Answer 34

-Spinal motor neurons

Question 35

Does the corticospinal tract cross, and if so, where?

Answer 35

-Yes, caudal medulla

Question 36

What makes up the extrapyramidal tract?

Answer 36

- Vestibulospinal tract - Tectospinal tract - Reticulospinal tract - Rubrospinal tract

Question 37

Does the vestibulospinal tract carry sensory info or motor info?

Answer 37

-Motor

Question 38

Where does the vestibulospinal tract begin?

Answer 38

-Vestibular nucleus

Question 39

Where does the vestibulospinal tract end?

Answer 39

-Spinal motor neurons

Question 40

Does the vestibulospinal tract cross, and if so, where?

Answer 40

-Yes, caudal medulla

Question 41

Does the tectospinal tract carry sensory or motor info?

Answer 41

-Motor

Question 42

Where does the tectospinal tract begin?

Answer 42

-Tectum

Question 43

Where does the tectospinal tract end?

Answer 43

-Spinal motor neurons

Question 44

Does the tectospinal tract cross, and if so, where?

Answer 44

-Yes, caudal medulla

Question 45

Does the reticulospinal tract carry sensory or motor info?

Answer 45

-Motor

Question 46

Where does the reticulospinal tract begin?

Answer 46

-Cortex, primarily frontal and parietal lobes, specifically premotor and motor areas

Question 47

Where does the reticulospinal tract end?

Answer 47

-Spinal motor neurons

Question 48

Does the reticulospinal tract cross, and if so, where?

Answer 48

-Yes, caudal medulla

Question 49

Does the rubrospinal tract carry sensory or motor info?

Answer 49

-Motor

Question 50

Where does the rubrospinal tract begin?

Answer 50

-Red nucleus

Question 51

Where does the rubrospinal tract end?

Answer 51

-Spinal motor neurons

Question 52

Does the rubrospinal tract cross, and if so, where?

Answer 52

-Yes, caudal medulla