Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Neuroscience > Tracts > Flashcards

Tracts Flashcards

(67 cards)

Start Studying
0
Q

medial reticulospinal tract

A

originates reticular formation in pons
travels ipsi in spinal cord
synapes at all levels of SC on alpha & gamma MN and interneurons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

reticulospinal tracts

A

medial reticulospinal tract
lateral reticulospinal tract

DESCENDING TRACT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

medial reticulospinal tract action

A

increases muscle tone

facilitates voluntary movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

lateral reticulospinal tract

A

originates reticular formation medulla
crosses at medulla
travels down SC on BOTH sides
synapses at all levels SC and alpha & gamma MN & interneurons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

lateral reticulospinal tract action

A

decreases muscle tone

inhibits voluntary movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

vestibulospinal tracts

A

medial vestibulospinal tract
lateral vestibulospinal tract

originates:
vestibular nuclei
superior colliculus
interstitial nucleus

DESCENDING TRACT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

medial vestibulospinal tract

A

travels BOTH sides SC
activates LMN for accessory nerve, head & neck movements
projects bilaterally

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

lateral vestibulospinal tract

A

does NOT cross
facilitates activity of extensor MN & extensor reflexes
projects to all levels of SC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

vestibulospinal tracts promote

A

antigravity reactions, activity of extensor muscles, especially neck and axial trunk

coordinates head and neck with movement rest of body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

lateral reticulospinal tract damage

A

may promote hypertonicity and spasticity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

rubrospinal tract facilitates

A

flexor motor neurons & flexor reflexes via interneurons

intentional movement of arms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

rubrospinal tract

A

somatotopically organized
sends fibers to contra cervical spine (UE)
projections to cerebellum

DESCENDING TRACT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

rubrospinal tract lesions at midbrain (red nucleus)

A

motor deficits on contra side

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

rubrospinal tract lesions below midbrain

A

ipsi movement deficits

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

corticobulbar tract

A

activates LMN’s for cranial nerves

projections bilateral EXCEPT CN VII, XI, XII synapse on contra CN nucleus

DESCENDING TRACT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

corticobulbar tract CN’s

A

III to XII

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

dorsal columns actions

A

tactile sensation
vibration
proprioception

ASCENDING TRACTS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

dorsal columns 1st order neurons

A

ipsi side SC

synapse in medulla at cuneate & gracile nuclei

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

dorsal columns 2nd order neurons

A

fibers from cuneate & gracile to thalamus on contra side

CROSS AT SENSORY DECUSSATION

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

dorsal columns 3rd order neurons

A

fibers from thalamus to somatosensory strip on ipsi side

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

cuneate/medial lemniscus

A

cervical and upper thoracic synapse here

upper body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

gracile/medial lemniscus

A

sacral, lumbar, lower thoracic synapse here

lower body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

dorsal columns effect of SC injury

A

ipsi loss of:
discriminative touch
vibration sense
proprioception

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

spinocerebellar tracts

A

ASCENDING

dorsal/posterior spinocerebellar (s/c)
cuneo spinocerebellar (cuneocerebellar)
ventral/anterior spinocerebellar
rostral spinocerenellar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
dorsal/posterior spinocerebellar
travels ipsi in SC, brainstem, & cerebellum synapses at nucleus of clarke deals with info from muscle spindles & GTOs Lamina VII levels C8-L2
25
dorsal/posterior spinocerebellar actions
non-conscious proprioception from body & legs
26
cuneocerebellar tract
travels ipsi in SC, brainstem, & cerebellum | does NOT synapse at cuneate nucleus
27
cuneocerebellar tract actions
non-conscious proprioception of arms muscle spindles & GTOs
28
ventral/anterior spinocerebellar tract
GTO neurons synapse in dorsal horn of gray matter - lamina V - VII Crosses to other side of segment, travels contra up SC, crosses back at pons
29
ventral/anterior spinocerebellar actions
provides info about leg movements and postural adjustment non-conscious proprioception
30
rostral spinocerebellar
synapses at dorsal horn of gray matter, crosses at segment, travels ipsi up SC, crosses back at pons
31
rostral spinocerebellar actions
non-conscious proprioception of arms
32
anterolateral system/spinothalamic tract
ASCENDING Direct - neospinothalamic Indirect - paleospinothalamic, spinoreticular, spinomesencephalic
33
direct spinothalamic tract
neospinothalamic synapses in dorsal horn has collaterals connecting spinal segments above and below crosses at SC segment travels up contra SC to thalamus continues from thalamus to somatosensory cortex
34
direct spinothalamic tract actions
pain temperature crude touch (neospinothalamic)
35
neospinothalamic lesion in SC
won't lose all pain & temperature sensation at that level due to collaterals
36
lesion of entire left side of spinal segment
NO sensation on left side | NO pain & temperature on right side
37
indirect spinothalamic pathways
paleospinothalamic spinoreticular spinomesencephalaic ascend on both sides poor somatotopic mapping multiple synapses in reticular formation, hypothalamus, PAG, limbic system
38
indirect spinothalamic pathways actions
involved in autonomic, endocrine, motor & arousal systems, aspects of pain, temperature & crude touch may help activate pain-inhibiting mechanisms
39
direct spinothalamic tract injury
complete contra loss of pain, temperature & crude touch below level of lesion
40
indirect spinothalamic tract injury
less clear, may alter arousal & affective responses to pain changes in how you experience pain and temperature
41
descending tracts
carry signals related to movement and autonomic activity from higher levels of the CNS to the SC ``` tracts: corticospinal (pyramidal) rubrospinal tectospinal vestibulospinal recticulospinal propiospinal ```
42
corticospinal/pyramidal
DESCENDING largest descending tract controls: voluntary movement of the upper and lower limbs by providing direct input to MNs (and INs) at every level of SC
43
2 portions pyramida/corticospinal tract
lateral corticospinal | anterior corticospinal
44
corticospinal tract travels
from primary motor strip in precentral gyrus of frontal lobe travels ipsi to medulla 90% cross at caudal medulla - pyramidal decussation - travel down SC contra - lateral corticospinal tract (other 10% travel ipsi down SC but synapse on contra MNs - anterior corticospinal tract)
45
pyramidal tract organization
somatotopically - face lateral, legs medial
46
lateral corticospinal controls
fine movements of arms, legs, hands, and feet
47
anterior corticospinal controls
axial muscles of trunk
48
lateral corticospinal tract lesions
ipsi paralysis of UE & LE below level of lesion (crosses in medulla)
49
rubrospinal tract
DESCENDING from red nucleus in midbrain - crosses at PAG (midbrain)
50
rubrospinal tract functions
excite flexor MNs | inhibits extensor MNs
51
tectospinal tract
DESCENDING superior colliculus in midbrain to upper cervical segments
52
tectospinal tract functions
may coordinate head & neck movements with visual and auditory stimuli
53
medial longitudinal fasciculus
DESCENDING fibers coming from vestibular and reticular nuclei from superior colliculus to ipsi upper cervical SC
54
medial longitudinal fasciculus function
positions head in response to vestibular apparatus
55
vestibulospinal tract
DESCENDING lateral & medial aspects ipsi both from vestibular nuclei
56
lateral vestibulospinal tract function
excite extensor muscles of legs & trunks
57
medial vestibulospinal tract function
adjusts head position with regard to posture
58
recticulospinal fibers
DESCENDING ``` from reticular formation signals for: -suppresses reflexes (movement) -autonomic NS -modulates spinothalamic system (pain) ```
59
propriospinal fibers
DESCENDING connect multiple adjacent spinal segments mediate reflexes intrinsic to SC some can cross numerous spinal segments
60
brown sequard syndrome
- hemisection of SC - damage to: lateral corticospinal, posterior/dorsal columns, ventral systems - ipsilateral to lesion - hemiparesis and other motor signs, loss of vibration, proprioception & discriminative touch - contralateral to lesion - loss of pain & temperature - dissociation between pain/temp vs proprioception and touch (opposite sides)
61
syringomyelia
damage to anterior white commissure near central canal - affects spinothalamic tract bilateral loss of pain and temperature, NOT proprioception and touch
62
ALS
progressive degeneration of corticospinal tract and ventral horn cells - weakness & discoordination - usually affects lower limbs first - ultimately affects muscles for breathing & swallowing - descending autonomic pathways also affects
63
damage to 1 dorsal root
sensor function not totally disrupted - sensory dermatome is innervated by several nerve root - may cause loss in muscle tone due to loss of muscle spindle activity
64
damage to 1 ventral nerve root
total loss of muscle function for associated muscles
65
Anterior trigeminothalamic tract
Cutaneous receptors from the face and head ``` Adetla and C fibers from CN: V VII IX X ```
66
Anterior Trigeminothalamic tract pathway
Main sensory nucleus, spinal trigeminal nucleus and related nuclei for CN VII, IX, X Decussated and ascend thru brainstem Project to ventral posteromedial nucleus in thalamus Project to face areas of somatosensory cortex I and II

Neuroscience (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions