lab 6 - descending pathways

Question 1

Dorsolateral spinal cord pathways terminate and synapse​ where

Answer 1

lateral MNs and INs

Question 2

what kind of movements do the Dorsolateral spinal cord pathways serve

Answer 2

single limb movement​

Question 3

Ventromedial spinal cord pathways- terminate and synapse where

Answer 3

on the medial MNs and INs
this info is shared to medial MN on the other sid eof the spinal cord

Question 4

what kind of movement does the Ventromedial spinal cord pathways serve

Answer 4

axial and proximal limb girdle muscles

Question 5

dorsolateral pathways

Answer 5

Corticospinal Tract

Rubrospinal Tract

Question 6

Ventromedial pathways

Answer 6

Ventral CST

Vestibulospinal Tract

Tectospinal Tract

Reticulospinal Tract

Question 7

Lateral Corticospinal tract (CST) orginates

Answer 7

Pre-central gyrus

Question 8

Lateral Corticospinal tract (CST) terminates

Answer 8

Lateral MN & IN’s of ventral horn of spinal cord

Question 9

CST role - info

Answer 9

serving limb muscles
enables fractionation of fingers/hand/UE
modulate sensory info.

Question 10

where does CST cross and what crosses

Answer 10

Pyramidal decussation of lower medulla

90% of fibers cross to become Lateral CST in SC

Question 11

10% of fibers do NOT cross (CST) what happen to them

Answer 11

stay ipsilateral to become the ventral corticospinal tract (VCST)

synpase onto medial MN and IN - serves bilateral axial/trunk muscles

Question 12

Rubrospinal tract orginates ​

Answer 12

Arises from Red nucleus
Located in the midbrain

Question 13

rubrospinal tract temrinates

Answer 13

Terminates on lateral MN’s and IN’s of the ventral horn at primarily cervical spinal levels

Question 14

Rubrospinal tract primary action

Answer 14

to facilitate MN that innervate large muscle movements and fine motor control of UE, primarily serves cervical regions

Question 15

Vestibulospinal tracts convey impulses from where

Answer 15

convey impulses from the labyrinth

Question 16

Vestibulospinal tracts two tracts

Answer 16

medial and lateral

Question 17

medial Vestibulospinal tracts orginates

Answer 17

Medial Vestibular nucleus

Question 18

medial Vestibulospinal tracts terminate​s

Answer 18

Terminates on ipsilateral Medial MN’s and IN’s of ventral horn primarily at cervical levels

Question 19

medial Vestibulospinal tracts function

Answer 19

Activates LMN associated with spinal accessory n: rotation/lifting of head and shoulder blade

movements appropriate for orientation of individual during altered posture and balance

Question 20

lateral Vestibulospinal tracts orginates

Answer 20

Lateral Vestibular nucleus

Question 21

lateral Vestibulospinal tracts terminate​s

Answer 21

Terminates on ipsilateral Medial MN’s and IN’s of ventral horn primarily at ALL spinal levels

Question 22

lateral Vestibulospinal tracts function

Answer 22

important for maintenance of upright posture and balance via excitation of antigravity/extensor muscles

Question 23

Vestibulospinal tracts cross

Answer 23

no

Question 24

Tectospinal tract function

Answer 24

“believed” to direct head movements in response to visual stimuli

Question 25

Tectospinal tract orginates

Answer 25

Superior colliculus in the midbrain

Question 26

Tectospinal tract terminates

Answer 26

Terminates on contralateral Medial MN’s and IN’s of ventral horn primarily at cervical levels

Question 27

Reticulospinal tract role

Answer 27

Coordinates trunk/prox muscle response during limb mvmt via balancing actions b/w extensors and flexors

Question 28

Reticulospinal tract- lateral role

Answer 28

role in suppressing extensor activity

Question 29

Reticulospinal tract - medial role

Answer 29

role in facilitating extensor activity

Question 30

Reticulospinal tract - lateral orginates

Answer 30

neurons in the reticular formation of the medulla

Question 31

Reticulospinal tract - lateral terminates

Answer 31

Terminates on Medial MN’s and IN’s of ventral horn at all levels of SC

Question 32

Reticulospinal tract - lateral cross

Answer 32

no

Question 33

Reticulospinal tract - medial role

Answer 33

role in facilitating extensor activity

Question 34

Reticulospinal tract - orginates

Answer 34

cells and neurons in the reticular formation of the Pons

Question 35

Reticulospinal tract - terminates

Answer 35

Terminates on Medial MN’s and IN’s of ventral horn at all levels of SC

Question 36

Reticulospinal tract - crosses

Answer 36

no

Question 37

Corticobulbar tract- what is it

Answer 37

any descending cranial nerve-related motor axons from cerebral cortex traveling to the respective contralateral nuclei – which in turn gives rise to the respective cranial nerve

Question 38

Corticobulbar tract path

Answer 38

lateral aspect of motor cortex (pre-central gyrus) and association areas (pre-motor, etc…) to CN nuclei of contralateral brainstem